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The Gamma node applies Gamma adjustment to the heightfield. It works exactly as Gamma works in an image processing program.

Node Properties
GammaThe Gamma range is 0.0 to 2.5, with 1.0 being neutral or the original incoming gamma.

Enable Parallel ProcessingEnable multi-CPU processing of the effect.
Chunk SizeThe chunk size into which the image is divided for processing.
Edge BlendingThe percentage of blending between the edges of neighboring chunks. Higher values require more memory and processing time.

If you see grid-like artifacts in your output, use higher values for Edge Blending. If that does not help, try increasing Chunk Size. If either does not help, you can disable Parallel Processing. This may result in slower builds, but the result will be accurate and error free.