C#:APP: Tint Color

[ShadowLocke]

How can I tint one color with another color? i.e. say i have a Color.LightSkyBlue
(135,206,250) i want to tint it with Color.Green(0,128, 0)

Whats the math behind it?

[Curtis Rutland]

How can I tint one color with another color? i.e. say i have a Color.LightSkyBlue
(135,206,250) i want to tint it with Color.Green(0,128, 0)

Whats the math behind it?

Couldn't you just use some application (like Paint.NET) that has a color wheel or mixer, find the color you actually want and then use that RRGGBB value?

Why do you want the program to blend your colors?

[Plater]

Well I had really though I remember seeing something in the Color class about tinting but I can't find it anymore.
Have you read through this? http://www.inform.umd.edu/MCTP/Cours...son/index.html

[ShadowLocke]

Well I had really though I remember seeing something in the Color class about tinting but I can't find it anymore.
Have you read through this? http://www.inform.umd.edu/MCTP/Cours...son/index.html

I was thinking the same. I have found a class that may do it for me.

System.Drawing.Imaging.ColorMatrix

I havent had a chane to tinker with it too much, but it looks like this is gonna work for me. (great reference btw.)

[ShadowLocke]

This will do, heres what I came up with:

        private Bitmap TintBitmap(ref Bitmap b, Color tintColor)
        {
            ImageAttributes ia = new ImageAttributes();
            float tR = (float)tintColor.R / 255;
            float tG = (float)tintColor.G / 255;
            float tB = (float)tintColor.B / 255;
 
            ColorMatrix cm = new ColorMatrix(new float[][]
            {
                new float[] {1, 0, 0, 0, 0},
                new float[] {0, 1, 0, 0, 0},
                new float[] {0, 0, 1, 0, 0},
                new float[] {0, 0, 0, 1, 0},
                new float[] {tR, tG, tB, 0, 1}
            });
 
            ia.SetColorMatrix(cm, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
 
            Bitmap result = new Bitmap(b.Width, b.Height);
            Point[] pts = new Point[] { new Point(0, 0), new Point(b.Width, 0), new Point(0, b.Height) };
            Rectangle rect = new Rectangle(0, 0, b.Width, b.Height);
 
            using (Graphics g = Graphics.FromImage((Image)result))
            {
                g.DrawImage(b, pts, rect, GraphicsUnit.Pixel, ia);
            }
 
            return result;
        }

[Plater]

Do you need to pass bitmap b in by reference? (Is that just to keep memory usage down for very large bitmap objects?)

[ShadowLocke]

Do you need to pass bitmap b in by reference? (Is that just to keep memory usage down for very large bitmap objects?)

Correct, one of my many feeble attempts at minimizing memory consumption.