GIF file size increases dramatically after conversion to sRGB

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Posted By
Candace_Gilbert
May 4, 2004
Views
414
Replies
1
Status
Closed
Hi!

I was saving an image for web using Save for Web and noticed something odd. When I first went to Save for Web, the projected GIF file size was about 3 or 4 kb with 64 colors and 100% diffusion dither. However, I noticed that I had forgotten to convert the file to sRGB, so the colors were looking muddy.

I cancelled out of Save for Web, converted to sRGB (Image>Mode>Convert to Profile), then went directly back into Save for Web. But this time, with 64 colors and 100% diffusion dither, my projected GIF file size was 120 kb!

Any thoughts as to why this might be?

Thanks!
Candace
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conversion file increase size srgb

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Candace_Gilbert
May 4, 2004
It seems that the issue is with the 21st color. If I bring it down to 20 colors (100% diffusion dither), the projected file size is 3.753 kb, but then when I nudge it up to 21 colors (no other changes) the projected file size jumps to 36.71 kb.

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