Open up the Save for Web & Devices dialog box (File > Save for Web & Devices). In reality you have it set to selective and are only actually generating a 53 color palette, that all those images have to share colors from, that will never look good. Here are the steps for saving a Photoshop file for the Web once you've created slices and customized the slice names and destinations.
Photoshop save for web slices full#
If you don't really have a requirement for only 256 colors, then set it to 24 bit full color. There are different dithering algorthims in Photoshop, try them and see which one gives you the best results. I don't know why you need a 256 index color palette, that such as 1997 requirement, but if you really need to cut your full color images down to 256 colors you need to enable dithering so that it can try and create intermediate colors by mixing the palette colors and tricking the eye to see more colors than are actually there. In your case, you are cutting the color space down from 24 bit full color to index color 8 bit, you can't get enough colors in 256 colors in your palette to represent all the colors in the 24 bit original. Posterization occurs when you reduce the number of colors to a pallet with a fixed number of colors that can't accomadate all the colors in your image. Pixelation only occurs when you try and display an image larger than its native resoluion, ie: enlarging it much larger than it was originally. I think you are confusing pixelation with posterization.
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