Change Color of Image

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I've a black and white image with 32-bpp but I want to change its color to some specific like red or green...I searched and tested many .net applications but none of 'em could do that. So any idea ?

Posted 6-Jul-10 18:45pm

Xmen Real

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2 solutions

Solution 1

There is no real way to do this accurately, a greyscale image has discarded color info. You can do a color wash easy enough, my image processing articles show how to do that, but you won't turn greyscale back into real, accurate color.

Posted 6-Jul-10 19:23pm

Christian Graus

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Xmen Real 7-Jul-10 3:20am

I have read all your articles about image processing but they all change color of colored images.

Xmen Real 7-Jul-10 3:25am

Got an idea, see my answer and thanks for reply. Now I will have to read your articles again ;)

Xmen Real 7-Jul-10 3:59am

Can you tell me how can I multiply colors ? Like Multiply effect in Photoshop

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**Xmen Real** · Accepted Answer · 2010-07-06T21:24:00

NOTE : This is just safe code and will be slow. I will change it to unsafe later but the following code is just for showing the idea ;).

void ChangeColor(Bitmap image)
{
    for (int x = 0; x < image.Width; x++)
    {
        for (int y = 0; y < image.Height; y++)
        {
            Color c = image.GetPixel(x, y);
            Color nc = Color.FromArgb(c.A, c.R, 0, 0);
            image.SetPixel(x, y, nc);
        }
    }
}