Texture Synthesis

Absolute Value



• Load image into accum buffer
• Subtract: glAccum(GL_ADD, -.5)
• Multiply by 2: glAccum(GL_MULT, 2.0)
• Return positive values: glAccum(GL_RETURN, 1.)
• Return negative values: glAccum(GL_RETURN, -1.)
• Blend the two results

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