In article , says…
andrews wrote:
In Photoshop can I see at once all the colors there are in a picture?
If you want to know how many different colours there are, the IrfanView program will tell you. If there are less than 256 colours in the image, in PS using Save For Web as a GIF with an exact palette will show you all the colours (I think).
If the image comes from a jpeg file then the actual colours will be different from the original because jpeg compression does not preserve colours accurately.
If, on the other hand, you mean "Can I make (and see) a picture containing all available colours that can be used (in
some specific colour-space)?", then the answer is approximately "yes", if you are using 8 bit colour (you just need a
4096×4096) image, and probably "no", if you are thinking of 12,14, or 16 bit colours.
Mike