The file size of an image is the digital size
of the image file, measured in kilobytes (K), megabytes (MB), or
gigabytes (GB). File size is proportional to the pixel dimensions of
the image. Images with more pixels may produce more detail at a given
printed size, but they require more disk space to store and may be
slower to edit and print. Image resolution thus becomes a compromise
between image quality (capturing all the data you need) and file size.
Another
factor that affects file size is file format. Due to varying
compression methods used by GIF, JPEG, and PNG file formats, file sizes
can vary considerably for the same pixel dimensions. Similarly, color
bit-depth and the number of layers and channels in an image affect file
size.
Photoshop supports a maximum pixel
dimensions of 300,000 by 300,000 pixels per image. This restriction
places limits on the print size and resolution available to an image.
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