Find out how many colors in a Bitmap

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I need to know how many colors in the color table are actually used.

Do I need to use Windows API?

I been searching the Bitmap doc and can't find a property that would help.

Is there a way other than Windows API to get that information?



Thanks


PS
If I type: Bitmap1.Entries.
Intelisense gives many options that do not appear as Bitmap.Entries
properties.
I assume those are general array properties and are not specific for
Bitmap.Entries.
Right?


.

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