How to do colour clustering on a PNG image with a transparent background?

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Salad Box
Salad Box on 14 Mar 2021
Edited: Salad Box on 14 Mar 2021
Hi,
I have a sample PNG image the background of which has been removed. See below ( well it shows the white background here but please imagine the background is clear not white).
However when I display the image in Matlab using 'imshow' I get the image below (not surprisingly) on a black background.
My main goal is to do colour clustering on the image with the transparent background.
Now sadly for the image with the black background, the main 5 colours I extract out of the image are below with ( no surprisingly ) black being the most dominant colour. ( See below).
That is not I want.
I would like to do colour clustering on the image with the transparent background.
How can I achieve that?
Please advise.

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