CODEWITHSUNDEEP
c++winapi
Alex
Alex

Reputation: 41

Win32 bitmap color to grayscale

i am writing a program that opens, rotates, scales,invert color,converts to grayscale and save bitmap (.bmp) But i dont seem to get the the converting to greyscale(ie black and white) working every other code works perfectly...

the code for my color inversion is below...

 case 3:
{
    hdc=GetDC(hWnd);
    GetClientRect(hWnd,&rt);
    BitBlt(hdc,0,0,rt.right,rt.bottom,hdc,0,0,NOTSRCCOPY);
    ReleaseDC(NULL,hdc);
}

this seem to work but getting the DC and trying to change it to grey scale isn't working using BitBlt... I would like to get an idea on how to get the DC and convert it to grey-scale... winapi thanks...

Upvotes: 3

Views: 4058

Answers (1)

Adrian McCarthy
Adrian McCarthy

Reputation: 47962

Raymond Chen gives a complete example of using the color mapper in GDI to convert a color image to grayscale using BitBlt.

Upvotes: 2

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