Quote:
Originally Posted by robski
The existence of chroma sub sampling in JPEG compression explains why better compression ratios are achieved (ratio between original file size & compressed file size) with colour photos than with greyscale (mono) photos.
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Ah ha - so that's the answer. I've always wondered why a when preparing my images for the forum, to achieve ~200k file size from a 1000 x 667 image, with colour a jpeg compression quality setting of 10 gives the required file size, where as with mono I have to reduce the quality setting to 6 or 7