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For everyone that still does not get it, and there seem to be a lot of people judging by this thread:
Photoshops "Save for Web" saves the img using the _WEB SAFE PALETTE_. That Pallet was never invented to produce low sized gif files, it was invented to have a standard color palette usable by all browsers that display images. The palette is 216 colors big, which leaves 40 colors or so for the app itself to use if it does not want to display ITSELF using web safe colors.
This was done because when the Web was developed most people were not having GFX cards with more than 8bit colors causing hahahahahahas for example to switch its 256 color palette used when you switched between programs. So the web safe colors were invented to actually make sure the site and picture looks good on any browser that supports pictures.
So obviously, when you save for web in photoshop, and have an image that is full of blue, it will have to dither the colors to match the few blue-tones the web safe palette offers.
This is totally outdated, unless you want to support 8bit color users, you should not care about it.
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"Think about it a little more and you'll agree with me, because you're smart and I'm right."
- Charlie Munger
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