[RESOLVED] i want to increase the darkness of a color ?

[Jehannum]

This should work. It's just the opposite of a brightness adjuster that I use.

Subtract a value from each pixel's colour components (red, green, and blue). The bigger darknessVal, the darker the image will become.

Dim pixelColour As Color
Dim x,y As Integer
Dim darknessVal as Byte
...
For x = 0 to PhotoBmp.Width - 1
   For y = 0 to PhotoBmp.Height - 1
      pixelColour = photoBmp.GetPixel(x, y)
 
      red = pixelColour.R - darknessVal
      green = pixelColour.G - darknessVal
      blue = pixelColour.B - darknessVal
 
      pixelColour = Color.FromArgb(red, green, blue)
      photoBmp.SetPixel(x, y, pixelColour)
   Next
Next

But don't forget NOT to let red, green, or blue go below 0 after the subtraction. I didn't include the error checking code for reasons of clarity.

Bear in mind this is my first attempt at answering a question, and I'm a beginner myself.