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How do you increase/decrease the brightness of a bitmap?
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How do you increase/decrease the brightness of a bitmap?
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Updated 20-Jun-10 14:30pm
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Adding a constant value to all the color components of each pixel.
The way this is done depends on the bitmap format.

There are some methods of the gdiplus::Image class that can help.
(search with google the address of the documentation)
 
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Sweety Khan 21-Jun-10 2:43am    
can i do this like that

COLORREF rgb = dc.GetPixel(x, y);
BYTE r = GetRValue(rgb);
BYTE g = GetGValue(rgb);
BYTE b = GetBValue(rgb);
r+=50;
g+=50;
b+=50;
dc.SetPixel(x, y, RGB(r,g,b));
Emilio Garavaglia 21-Jun-10 3:57am    
Yes. Tht's the principle.
But may be inefficient. Better efficience can be acieved by knowing the bitmap internal format or by callig proper API (that maps to different implementation depending on the format)
Sweety Khan 21-Jun-10 7:03am    
can u please tell me the API?
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