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c#imageencodingpixel

GrayScale Pixels / value relation

I have to save lots of data and i've chosen to save them as an image in which

each pixel will have an value in [0,1] (inclusiv).{0->white/1->black).

How can i encode a value [0,1] into a pixel color?

Solution

  • Generally image data uses R,G,B, which are stored as unsigned bytes (e.g. they have a value from 0-255). Therefore, you need to multiply your [0,1] value by 255 to get the corresponding pixel value. Depending on how you are creating your image, you may need this as a byte array, or as a Color object:

    float colorvalue = 0.6f;
// as a byte array:
byte[] rgb = new byte[3];
rgb[0] = (byte)(colorvalue * 255);
rgb[1] = (byte)(colorvalue * 255);
rgb[2] = (byte)(colorvalue * 255);
//as a color:
Color newcol = Color.FromArgb((int)(colorvalue * 255), (int)(colorvalue * 255), (int)(colorvalue * 255));