Saving and Exporting Images

Saving and Exporting Images

Saving files in PNG format (Photoshop)

Saving files in JPEG 2000 format (Photoshop optional plug-in)

Saving files in JPEG format (Photoshop)

Saving files in GIF format (Photoshop)

Saving 16-bit-per-channel files in Cineon format (Photoshop)

Saving files in BMP format

Saving files in Photoshop Raw format (Photoshop)

Saving files in Photoshop DCS format (Photoshop)

Saving files in Photoshop EPS format (Photoshop)

Saving files in PNG format (Photoshop)

You can use the Save As command to save RGB, indexed-color, grayscale, and Bitmap-mode images in PNG format. For more information on the PNG format, see PNG.
Note: You can also save an image as one or more PNG files using the Save for Web command (Photoshop) or the Save Optimized command (ImageReady). For more information on optimizing images, see Optimizing images.

To save a file in PNG format:

1. Choose File > Save As and choose PNG from the Format menu.
2. Select an Interlace option:
• None displays the image in a browser only when download is complete.
• Interlaced displays low-resolution versions of the image in a browser as the file downloads. Interlacing makes download time seem shorter, but it also increases file size.
3. Click OK.

Saving files in JPEG 2000 format (Photoshop optional plug-in)

To save files in the JPEG 2000 format, the optional JPEG 2000 plug-in must be installed in Adobe Photoshop CS/Plug-Ins/Adobe Photoshop Only/File Formats. The optional JPEG 2000 plug-in can be found on the Photoshop CS installation CD in Goodies/Optional Plug-Ins/Photoshop Only/File Formats. You can save images in extended JPEG 2000 (JPF) format, which provides an expanded set of options compared to the standard JPEG 2000 (JP2) format. However, you can make files JP2 compatible by selecting the appropriate option in the JPEG 2000 dialog box. For more information on the JPEG 2000 format, see JPEG 2000 (Photoshop optional plug-in).
Note: You cannot save Duotone, Multichannel, or Bitmap mode images in JPEG 2000 format. To save these files as JPEG 2000, first convert them to RGB color.

To save a file in JPEG 2000 format:

1. Choose File > Save As, and choose JPEG 2000 from the Format menu.
2. Specify a filename and location, select saving options, and click Save, which opens the JPEG 2000 dialog box.
Important: If you want to save a JP2-compatible file, you must select the ICC Profile option (Windows) or the Embed Color Profile option (Mac OS) in the Save As dialog box. Otherwise, the JP2 Compatible option will be unavailable in the JPEG 2000 dialog box. The JP2-compatible option slightly increases the JPF file size. Keep in mind that JP2 viewers are not required to support ICC profiles and metadata present in JPF files, so color fidelity and other features may not work as expected.
3. (Optional) Enter a value in the File Size text box to set a target size for the saved file. The value in the Quality text box will adjust to the best quality for the file size you enter.
4. Do one of the following to specify the image quality:
• Select Lossless to compress the image without losing image quality. Selecting this option creates a larger file.
• Deselect Lossless to create a smaller file. Then drag the Quality pop-up slider or enter a value in the Quality text box to specify the image quality. A higher quality value results in better image quality and a larger file size.
If you specify an image quality that conflicts with a target file size you entered previously, Photoshop automatically changes the value in the File Size text box.
5. Select Fast Mode for faster previewing or encoding of the image. File size control, progressive optimization, and lossy with integer wavelet filter are not supported in Fast Mode.
6. Select Include Metadata to include file information. If your image file contains paths and you wish to store the paths information in the JPEG 2000 file, the Metadata option must be selected.
Deselect the Include Metadata and Include Color Settings options to make the image file size smaller.
7. Select Include Transparency to preserve transparency that exists in the original image. The Include Transparency option is dimmed if the image does not contain transparency.
8. Select JP2 Compatible to create a file that can be displayed in viewing software that supports standard JPEG 2000 (JP2) format but does not support extended JPEG 2000 (JPF) format.
9. Click the Advanced Options button to set the following options:
Compliance
Chooses the types of devices with which the file is compliant. Currently, only general devices (such as Web browsers) are supported.
Wavelet Filter
Specifies the type of numbers (coefficients) used to encode the file. Float is more accurate but cannot be used for Lossless compression. Selecting the Lossless compression option automatically sets the Wavelet Filter option to Integer.
Choose Float or Integer depending on your image and the result you want. Integer is usually the best option for an overall consistent appearance in the image. Float may sharpen the image but could cause it to lose some quality around edges.
Tile Size
Chooses the size of the tiles used in the image. When low quality values are used to optimize images smaller than 1024 x 1024 pixels, using the largest tile size will produce better results.
A tile size of 1024 is best for most images. When creating files with small dimensions (for cell phones, and so forth), a lower tile size should be used.
Metadata Format
Select the metadata format(s) to include in the image file. JPEG2000 XML is JPEG 2000-specific XML data; this option is only available if the image file contains this data. XMP is File Info data and EXIF is digital camera data.
Color Settings Format
Select the Color Settings Format to include in the image file. The ICC Profile option includes the full ICC profile specified in the Save As dialog box and is the default option. The Restricted ICC Profile option is intended for use in portable devices such as cell phones and PDAs. A Restricted ICC Profile must be in a JP2 file.
10. Choose an Optimization Order from the Order menu:
Growing Thumbnail
Presents a sequence of small thumbnail images increasing in size until they reach the image's full size.
Progressive
Presents an image that displays increasingly detailed versions of the entire image as data becomes available (for example, streaming over the Web to a browser). Progressive JPEG images have a slightly larger file size, require more RAM for viewing, and are not supported by all applications and JPEG 2000 viewing software.
Color
Makes the image appear first as a grayscale image, then as a color image.
Region of Interest
If your Photoshop document contains one or more alpha channels, you can choose an alpha channel to define a Region of Interest.
Once the alpha channel is loaded as a Region of Interest, choose an Enhance value to increase or decrease the quality of the Region of Interest relative to the rest of the image. Note that Enhance does not change the file size of the image, so enhancing the area inside the alpha channel will decrease the quality of the area outside the alpha channel (and vice versa).
The Region of Interest and Enhance options are not available if your Photoshop document does not have an alpha channel.
Note: The channel (alpha, spot, or Quick Mask) used to define the Region of Interest will be discarded in the final saved JPEG 2000 file.
11. To preview how the image will appear in JPEG 2000 viewing software, make sure you chose an Optimization Order in step 10. The Preview option takes into consideration how the image is optimized and will open the image accordingly. In the Download Preview area of the JPEG 200 dialog box, choose a download rate from the pop-up menu to view the estimated download time of the image, then click the Preview button.
You can use the Set Preview Zoom pop-up menu to zoom in or out of the image for better viewing. You can also use the Zoom tool and the Hand tool to adjust the viewing area of your preview.
12. When you're done setting options, click OK to generate the JPEG 2000 image file.

Saving files in JPEG format (Photoshop)

You can use the Save As command to save CMYK, RGB, and grayscale images in JPEG format. JPEG compresses file size by selectively discarding data. For more information, see About file compression and JPEG.
Note: You can also save an image as one or more JPEG files using the Save for Web command (Photoshop) or the Save Optimized command (ImageReady). For more information on optimizing images, see Optimizing images.

To save a file in JPEG format:

1. Choose File > Save As and choose JPEG from the Format menu.
2. In the JPEG Options dialog box, select the options you want, and click OK.
Matte
If the image contains transparency, choose a Matte color to simulate the appearance of background transparency. For more information on simulating transparency using the Matte option, see Optimization options for GIF and PNG-8 formats.
Image Options
To specify the image quality, choose an option from the Quality menu, drag the Quality pop-up slider, or enter a value between 0 and 12 in the Quality text box.
Format Options
Select Baseline ("Standard") to use a format recognized by most Web browsers, Baseline Optimized for optimized color and a slightly smaller file size, or Progressive to display a series of increasingly detailed scans (you specify how many) as the image downloads. Baseline Optimized and Progressive JPEG images are not supported by all Web browsers.
Size
To view the estimated download time, select a modem speed. (The Size preview is only available when Preview is selected.)
Note: Some applications may not be able to read a CMYK file saved in JPEG format. In addition, if you find that a Java application cannot read your JPEG file (in any color mode), try saving the file without a thumbnail preview.

Saving files in GIF format (Photoshop)

You can use the Save As command to save RGB, indexed-color, grayscale, or Bitmap-mode images directly in Compuserve GIF (known as GIF) format. The image is automatically converted to indexed-color mode. For more information about the GIF format, see GIF.
Note: You can also save an image as one or more GIF files using the Save for Web command (Photoshop) or the Save Optimized command (ImageReady). For more information on optimizing images, see Optimizing images.

To save a file in GIF format:

1. Choose File > Save As and choose CompuServe GIF from the Format menu.
2. For RGB images, the Indexed Color dialog box appears. Specify conversion options and click OK. For more information, see Conversion options for indexed-color images (Photoshop).
3. Select a row order for the GIF file, and click OK:
• Normal displays the image in a browser only when download is complete.
• Interlaced displays low-resolution versions of the image in a browser as the file downloads. Interlacing makes download time seem shorter, but it also increases file size.

Saving 16-bit-per-channel files in Cineon format (Photoshop)

RGB images that are 16 bits per channel can be saved in Cineon format for use in the Kodak Cineon Film System. For more information about the Cineon format, see Cineon.

To save a 16-bit-per-channel file in Cineon format:

Choose File > Save As and choose Cineon from the Format menu.

Saving files in BMP format

The BMP format is an image format for the Windows operating system. The images can range from black and white (1 byte per pixel) up to 24-bit color (16.7 million colors). For more information about the BMP format, see BMP.

To save a file in BMP format:

1. Do one of the following:
2. In Photoshop, choose File > Save As and choose BMP from the Format menu.
• In ImageReady, choose File > Export > Original Document, and choose BMP from the Save as Type (Windows) or Format (Mac OS) menu.
3. Specify a filename and location, and click Save.
4. In the BMP Options dialog box, select a file format, specify the bit depth and, if necessary, select Flip Row Order. For more options, click Advanced Modes and specify the BMP options.
5. Click OK.

Saving files in Photoshop Raw format (Photoshop)

The Photoshop Raw format is a file format for transferring images between applications and computer platforms. For more information about the Photoshop Raw format, see Photoshop Raw (Photoshop).

To save a file in Photoshop Raw format:

1. Choose File > Save As and choose Photoshop Raw from the Format menu.
2. In the Photoshop Raw Options dialog box, do the following:
• (Mac OS) Specify a File Type and File Creator, or accept the default values.
• Specify a Header parameter.
• Select whether to save the channels in an interleaved or noninterleaved order. 

Saving files in Photoshop DCS format (Photoshop)

DCS (Desktop Color Separations) format is a version of EPS that lets you save color separations of CMYK or multichannel files. For more information about the Photoshop DCS format, see Photoshop DCS 1.0 and 2.0 (Photoshop).

To save a file in Photoshop DCS format:

1. Choose File > Save As and choose Photoshop DCS 1.0 or Photoshop DCS 2.0 from the Format menu.
2. In the DCS Format dialog box, select the options you want, and click OK.
The dialog box includes all the options available for Photoshop EPS files. For more information, see Saving files in Photoshop EPS format (Photoshop). Additionally, the DCS menu gives you the option of creating a 72-ppi composite file that can be placed in a page layout application or used to proof the image:
• DCS 1.0 format creates one file for each color channel in the CMYK image. You can also create a fifth file: a grayscale or color composite. To view the composite file, you must keep all five files in the same folder.
• DCS 2.0 format retains spot-color channels in the image. You can save the color channels as multiple files (as for DCS 1.0) or as a single file. The single-file option saves disk space. You can also include a grayscale or color composite. 

Saving files in Photoshop EPS format (Photoshop)

Virtually all page layout, word processing, and graphic applications accept imported or placed EPS (Encapsulated PostScript) files. To print EPS files, you should use a PostScript printer. Non-PostScript printers will only print the screen-resolution preview. For more information about the Photoshop EPS format, see Photoshop EPS.

To save a file in Photoshop EPS format:

1. Choose File > Save As and choose Photoshop EPS from the Format menu.
2. In the EPS Options dialog box, select the options you want, and click OK:
Preview
Creates a low-resolution image to view in the destination application. Choose TIFF to share an EPS file between Windows and Mac OS systems. An 8-bit preview delivers better display quality but larger file size than a 1-bit preview.
Encoding
Determines the way image data is delivered to a PostScript output device:
• Choose ASCII or ASCII85 if you're printing from a Windows system, or if you experience printing errors or other difficulties.
• Binary produces a smaller file and leaves the original data intact. However, some page-layout applications and some commercial print spooling and network printing software may not support binary Photoshop EPS files.
• JPEG compresses the file by discarding some image data. You can choose the amount of JPEG compression from very little (JPEG Maximum Quality) to a lot (JPEG Low Quality). Files with JPEG encoding can be printed only on Level 2 (or later) PostScript printers and may not separate into individual plates.
Include Halftone Screen and Include Transfer Function
Control print specifications for high-end commercial print jobs. Consult your printer before selecting these options.
Transparent Whites
Displays white areas as transparent. This option is available only for images in Bitmap mode.
PostScript Color Management
Converts file data to the printer's color space. Do not select this option if you plan to place the image into another color-managed document. Doing so may disrupt the color management.
Note: Only PostScript Level 3 printers support PostScript Color Management for CMYK images. To print a CMYK image using PostScript Color Management on a Level 2 printer, convert the image to Lab mode before saving in EPS format.
Include Vector Data
Preserves any vector graphics (such as shapes and type) in the file. However, vector data in EPS and DCS files is only available to other applications; vector data is rasterized if you reopen the file in Photoshop.
Image Interpolation
Anti-aliases the printed appearance of a low-resolution image.

Saving files in Photoshop PDF format (Photoshop)

You can use the Save As command to save RGB, indexed-color, CMYK, grayscale, Bitmap-mode, Lab color, and duotone images in Photoshop PDF format. You can also use the PDF format to save multiple images in a multipage document or slide show presentation. (See Creating a PDF presentation.) Saving in Photoshop PDF format lets you specify security options for restricting access to the PDF document. The new 128-bit RC4 (Acrobat 6) encryption has an option for letting users view metadata and thumbnails in a secure PDF document using the File Browser. For more information about the PDF format including the differences between Photoshop PDF and generic PDF, see PDF.

To save a file in Photoshop PDF format:

1. Choose File > Save As and choose Photoshop PDF from the Format menu. You can select a Color option if you want to embed a color profile or use the profile specified with the Proof Setup command. Click Save.
2. In the PDF Options dialog box, select the options you want, and click OK.
Encoding
Determines the compression method (Zip or JPEG). For more information, see About file compression.
Note: Bitmap-mode images are automatically encoded using CCITT compression--the PDF Options dialog box does not appear.
Save Transparency
Preserves transparency when the file is opened in another application. (Transparency is always preserved when the file is reopened in Photoshop or ImageReady.) This option is not available if the file contains a spot color channel or does not contain transparency.
Image Interpolation
Anti-aliases the printed appearance of a low-resolution image.
Downgrade Color Profile
If you selected ICC Profile (Windows) or Embed Color Profile (Mac OS) for a version 4 profile in the Save dialog box, this option downgrades the profile to version 2. Select this option if you plan to open the file in an application that does not support version 4 profiles.
PDF Security
Specifies security options such as password protection and restricted access to a file's content. Select PDF Security and then click the Security Settings button to open the PDF Security dialog box. Specify the security options that you want and then click OK.
Include Vector Data
Preserves any vector graphics (such as shapes and type) as resolution-independent objects, ensuring smoother output. When it is selected, you can select the following options:
• Embed Fonts ensures that all fonts used in the file are displayed and printed, even on computers that do not have the fonts installed. Bitmap fonts, fonts that don't allow PDF embedding, substitute fonts, type that uses the faux bold style, and warped type cannot be embedded. Selecting Embed Fonts increases the size of the saved file.
• Use Outlines for Text saves text as paths. Select this option if embedding fonts results in a file that is too large, if you plan to open the file in an application that cannot read PDF files with embedded fonts, or if a font fails to display or print correctly. Text saved as outlines is not searchable or selectable in a PDF viewer. You can, however, edit the text when you reopen the file in Photoshop.
Note: The PDF viewer may display a substitute font if both Embed Fonts and Use Outlines for Text are deselected.

To specify PDF Security options:

1. In the PDF Options dialog box, select PDF Security and then click the Security Settings button to open the PDF Security dialog box.
2. In the PDF Security dialog box, select Password Required to Open Document and specify a Document Open Password to prevent users from opening the document unless they type the password you specify. Passwords are case-sensitive.
3. Select Password Required to Change Permission and Passwords and specify a Permissions Password to restrict users from printing and editing the file. Users cannot change these security settings unless they type the passwords that you specify. You cannot use the same password used for the Document Open Password. Users are required to enter the Permissions Passwords when opening the PDF file in Photoshop.
4. Use the Compatibility menu to choose the type of encryption for opening a password-protected document.
40-bit RC4 (Acrobat 3.x,4.x)
Specifies a low encryption level.
128-bit RC4 (Acrobat 5)
Specifies a high encryption level, but users of Acrobat 3 and Acrobat 4 cannot open PDF documents set with high encryption.
128-bit RC4 (Acrobat 6)
Specifies a high encryption level, but users of Acrobat 3, Acrobat 4, and Acrobat 5 cannot open PDF documents set with this encryption. This encryption lets you enable plaintext metadata and thumbnails, an option not available in versions earlier than Acrobat 6.
5. In the Compatibility area of the PDF Security dialog box, specify the following options:
For 40-bit RC4 (Acrobat 3.x,4.x) encryption:
No Printing
Prevents users from printing the document.
No Changing the Document
Prevents the user from making any changes to the document, including filling in signature and form fields.
No Content Copying or Extraction, Disable Accessibility
Prevents users from selecting and copying contents of the PDF document.
No Adding or Changing Comments and Form Fields
Prevents the user from adding or making changes to comments and form fields.
For 128-bit RC4 (Acrobat 5) or 128-bit RC4 (Acrobat 6) encryption:
Enable Content Access for the Visually Impaired
Lets visually impaired users use screen readers to read the document's contents.
Allow Content Copying and Extraction
Lets users select and copy the contents of the PDF document. It also lets utilities that need access to the contents of a PDF file, such as Acrobat Catalog, get to those contents.
No Encryption for Metadata and Thumbnail (Acrobat 6 only)
Lets metadata and thumbnails in a secure PDF document be viewed in the File Browser. Among the many uses of this feature, you can let clients read information (metadata) and preview images without the need to give them the password for full access to the secure PDF document.
Changes Allowed
Define which editing actions are allowed in the PDF document:
• None prevents the user from making any changes to the document, including filling in signature and form fields.
• Only Document Assembly lets users insert, delete, and rotate pages, as well as create bookmarks and thumbnail pages.
• Only Form Field Fill-in or Signing lets users fill in forms and add digital signatures. This option doesn't let users add comments or create form fields.
• Comment Authorizing, Form Field Fill-in or Signing lets users fill in forms and add digital signatures, and comments.
• General Editing, Comment and Form Field Authoring lets users change the document using any method listed in the Changes Allowed menu, except remove pages.
Printing
Specify the quality of printing for the PDF document:
• Not Allowed prevents users from printing the document.
• Low Resolution lets users print the document at no higher than 150-dpi resolution. Printing may be slower because each page is printed as a bitmapped image.
• Fully Allowed lets users print at any resolution, directing high-quality vector output to PostScript and other printers that support advanced high-quality printing features.
6. Click OK.

Saving large documents (Photoshop)

Photoshop supports documents up to 300,000 pixels in either dimension and offers three file formats for saving documents with images greater than 30,000 pixels in either dimension. Keep in mind that most other applications, including older versions of Photoshop, can only support files up to 2 GB in size or images up to 30,000 pixels in either dimension.

To save a document with a file size larger than 2 GB:

Choose File > Save As and choose one of the following file formats:
Large Document Format (PSB)
Supports documents of any pixel size and any file size. All Photoshop features are preserved in PSB files. Currently, PSB files are only supported by Photoshop CS. In Preferences under File Handling, the Enable Large Document Format option must be selected before you can save files in PSB format. For more information about the PSB format, see Large Document Format (PSB).
Photoshop Raw
Supports documents of any pixel dimension or file size, but does not support layers. Large documents saved in the Photoshop Raw format are flattened. For more information about the Photoshop Raw format, see Photoshop Raw (Photoshop).
TIFF
Supports files up to 4 GB in size. Documents larger than 4 GB cannot be saved in TIFF format. For more information about the TIFF format, see TIFF.

To enable the Large Document Format in Photoshop:

1. Do one of the following:
• (Windows) Choose Edit > Preferences > File Handling.
• (Mac OS) Choose Photoshop > Preferences > File Handling.
2. Select the Enable Large Document Format (.psb) option.

Setting the file saving options (Photoshop)

You can set a variety of file saving options in the Save As dialog box. The availability of options depends on the image you are saving and the selected file format. For example, if an image doesn't contain multiple layers, or if the selected file format doesn't support layers, the Layers option is dimmed. For file saving options in ImageReady,
As a Copy
Saves a copy of the file while keeping the current file open on your desktop.
Alpha Channels
Saves alpha channel information with the image. Disabling this option removes the alpha channels from the saved image.
Layers
Preserves all layers in the image. If this option is disabled or unavailable, all visible layers are flattened or merged (depending on the selected format).
Annotations
Saves annotations with the image.
Spot Colors
Saves spot channel information with the image. Disabling an option removes spot colors from the saved image.
Use Proof Setup, ICC Profile (Windows), or Embed Color Profile (Mac OS)
Creates a color-managed document
Important: The following image preview and file extension options are only available if the Ask When Saving option is chosen for Image Previews and Append File Extension in the File Handling Preferences dialog box.
Thumbnail (Windows)
Saves thumbnail data for the file.
Image Previews options (Mac OS)
Saves thumbnail data for the file. Thumbnails display in the Open dialog box. You can set these image preview options: Icon to use the preview as a file icon on the desktop, Full Size to save a 72-ppi version for use in applications that can only open low-resolution Photoshop images, Macintosh Thumbnail to display the preview in the Open dialog box, and Windows Thumbnail to save a preview that can display on Windows systems.
Use Lower Case
Makes the file extension lowercase.
File Extension options (Mac OS)
Specifies the format for file extensions. Select Append to add the format's extension to a filename and Use Lower Case to make the extension lowercase.

Saving files

You can save a file with its current filename, location, and format or with a different filename, location, format, and options. You can also save a copy of a file while leaving the current file open on your desktop.

To save changes to the current file:

Choose File > Save.

To save a file with a different name and location:

1. Choose File > Save As.
2. Type a filename, and choose a location for the file.
3. Click Save.

To save a file in a different file format:

1. Do one of the following:
• (Photoshop) Choose File > Save As.
• (ImageReady) Choose File > Export > Original Document.
2. Do one of the following:
• In Photoshop, choose a format from the Format menu.
• In ImageReady, choose from the Save as Type (Windows) or Format (Mac OS) menu.
Note: In Photoshop, if you choose a format that does not support all features of the document, a warning appears at the bottom of the dialog box. If you see this warning, it is recommended that you save a copy of the file in Photoshop format or in another format that supports all of the image data.
3. Specify a filename and location.
4. (Photoshop) In the Save As dialog box, select saving options. For more information, 
5. Click Save.

About the save commands

You can use the following commands to save images:
• Save to save changes you've made to the current file. In Photoshop, the file is saved in the current format; in ImageReady, the Save command always saves to PSD format.
• Save As to save an image with a different location or filename. In Photoshop, the Save As command lets you save an image in a different format and with different options. In ImageReady, the Save As command always saves to PSD format.
• Export Original Document (ImageReady) to flatten the layers in a copy of the original image and save the copy in a variety of file formats. Some information (such as slices and optimization settings) is not preserved when an original image is saved to file formats other than Photoshop.
• Save a Version (Photoshop). This command is available for an image that is managed by a Version Cue Workspace. Versioning lets you save different versions of a file and comment on each. For more information, see Working with Adobe Version Cue managed projects.
If you're working with a file from an Adobe Version Cue project, the document title bar provides additional information about the status of the file. (See Working with Adobe Version Cue managed projects.)
• Save for Web (Photoshop), Save Optimized (ImageReady), and Save Optimized As (ImageReady) to save an optimized image for the Web. See Optimizing images and Saving optimized images.
Note: 16-bit-per-channel images can only be saved in the following formats using the Save As command: Photoshop, Photoshop PDF, Photoshop Raw, Large Document Format (PSB), Cineon, PNG, and TIFF. When using the Save for Web command with a 16-bit-per-channel image, Photoshop automatically converts the image from 16-bits per channel to 8-bits per channel.

Saving images

The saving options vary between Photoshop and ImageReady. The primary focus of ImageReady is producing images for the Web. If ImageReady doesn't provide the file format or option you need, you can edit in Photoshop. For more information on saving an image for the Web, see About optimization and Optimizing images.
To preserve all the Photoshop features in your edited image (layers, effects, masks, styles, and so forth), it's best to save a copy of your image in Photoshop format (PSD). (See Photoshop format (PSD).) Like most file formats, PSD can only support files up to 2 GB in size. In Photoshop, if you are working with documents larger than 2 GB in file size, you can save your image in the new Large Document Format (PSB), Photoshop Raw (flattened image only), and TIFF (up to 4 GB in size only). For more information on saving large documents, see Saving large documents (Photoshop).