Tone Reproduction

Thresholding (Halftoning)



• To threshold, use accumulation buffer or subractive blend
• Subtract halftone screen from image
  • Create screen by replicating pattern across framebuffer
  • glCopyPixels or texture with GL_REPEAT wrapping
• Clamping sets pixels < threshold to zero
• Use glPixelMap or scale & bias to set non-zero pixels to 1

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