Quote:
Originally Posted by theducks
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I can not believe a 16 bit Greyscale will save that much filesize over the same size color image.
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16
LEVEL = 4bit, not 16bit
The difference would depend largely on the bit depth of the original color image and the compression type and degree used for both the original color and the new greyscale.
At matching bit depths and uncompressed, the greyscale image would be roughly 1/3rd the size of the color, assuming that the files' metadata headers and any ancillary data is small. This could add up to a large total difference if there are a lot of images.