CountColours is a free Photoshop filter that can count unique RGB colors in an image or selection, as well as unique values in individual channels. It's compatible with both 8 and 16-bit images and requires Photoshop.
One of the best things about CountColours is that it is compatible with both 8 and 16 bit images. This means that no matter what type of image you are working with, this filter will be able to accurately count the colours and values in it.
Overall, CountColours is an essential tool for anyone who needs to quickly and accurately count the colours and values in an image or selection. It is easy to use and makes working with digital images much easier. However, it is important to note that this filter does require Photoshop in order to work properly. If you do not have Photoshop, you will not be able to use CountColours.
Version 1.1b3: N/A