If 8bits per channel mode refers to 256 colors available in an document, what if I convert it into

Question

If 8bits per channel mode refers to 256 colors available in a document, what if I convert it into a 16bits mode per channel and would it becomes 65536 colors available in this document? why? thank you!

Chuck Uebele · Accepted Answer

The file would stay with the same number of color that it originally had in 8 bit. Increasing the bit depth doesn't add colors that were never there. However, if you start to edit with the new 16 bit depth,  some editing would increase the colors like blurring. More colors would be created in that the old colors are blurring together and creating new colors. Same with applying gradients. They would be smoother.

Test Screen Name · Answer

8 bits per channel is 256 colours per CHANNEL. 8 bits per channel is the normal thing for RGB.

So... RGB has 3 channels, and if EACH of 3 channels has 8 bits, you have 256 x 256 x 256 colours = 16,777,216 colours.

If you went to 16 bits per channel, an RGB image would have 35,184,372,088,832 colours, I think. That's quite a lot.

However, if it is indexed colour, that has only one channel. So 8 bit mode in indexed colour is only 256 colours.

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