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getting RGB data from a BMP

Posted on 2003-12-11
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Last Modified: 2013-11-20
Hello people
I want to manipulate the RGB data for a windows BMP for image processing so how do i get the RGB array/matrix from a BMP image pleas help
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Question by:cyberizen
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5 Comments
 
LVL 13

Expert Comment

by:SteH
ID: 9920183
Since you are asking in the MFC-TA I suggest to load the bitmap into a CBitmap. Then you can get the RGB values into a buffer using GetBitmapBits:

CBitmap bmp;
HBITMAP hbmp = (HBITMAP) ::LoadImage (AfxGetInstanceHandle (), fileName, IBM_BITMAP, 0, 0, LR_LOADFROMFILE);
bmp.Attach (hbmp);

BITMAP bbmp;

bmp.GetObject (sizeof (bbmp), &bbmp);

DWORD nsize = bbmp.bmWidthBytes * bbmp.bmHeight;

BYTE *buf = new BYTE(nsize);
bmp.GetBitmapBits (nsize, buf);

....

delete buf

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Author Comment

by:cyberizen
ID: 9921640
hello newbie here
well i have the BYTES now what next how do i extract the RED GREEN and BLUE values

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