how find amount of different values in a matrix?

Hello,

I'm trying to find the amount of different individual colours in an
image.
The image is in RGB format so pixel colour will be defined by
image(:,:,1:3).

The only way I can think of doing this is by searching through the
image one pixel at a time and recording the colour of the current
pixel, then checking to see if it has already been sen in a previous
pixel.

Surely there must be a faster way

any ideas?

Thanks very much for any help offered,
Adam

.

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