Find and replace non-websafe colors

For more information, see Optimize GIF, PNG, TIFF, BMP, and PICT files.

A color is web-safe if it appears to be the same color on both Mac OS and Windows platforms. A non‑websafe color is a color not included in the Web216 color palette.

 Select Find Non‑Web216 from the Find pop-up menu of the Find panel.

Find Non‑Web216 does not find or replace pixels within image objects.

 community help (adobe.com)