reading in a bitmap to get RGB values

Bill Stuar

CBuilder Developer

Sun, 04 Nov 2001 03:00:00 GMT

reading in a bitmap to get RGB values

I can't seem to get the rgd values of the pixels. I read in the bitmap
and can read each character in order to write them out to another
bitmap. But when I dump the character to cout it comes out as a zero. So
I tried using byte, or word and still all I get are zeros. I just want
to be able to add up the colors used in a bitmap by looking at each
pixel. Thanks

Bill

Damon Chandle

CBuilder Developer

Mon, 05 Nov 2001 03:00:00 GMT

Re:reading in a bitmap to get RGB values

Hi Bill,

Quote

> I can't seem to get the rgd values of the pixels. I read in the bitmap
> and can read each character in order to write them out to another
> bitmap. But when I dump the character to cout it comes out as a zero. So
> I tried using byte, or word and still all I get are zeros. I just want
> to be able to add up the colors used in a bitmap by looking at each
> pixel. Thanks

Have a look at the GetRValue(), GetGValue(), and GetBValue() API
macros. These should do what you want. You'll want to convert your
pixel value to a COLORREF before using these macros. Good luck.

->Damon
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