There are two ways to reduce colour banding in POV-RAY
1. 16-bit depth to have a more accurate spectrum of colours.
2. Dither to fake the colour gradient.
Unfortunately, neither of these methods is available if the output format is
If we output a PNG file with +TH, and then, convert it to JPG, the colour
I wonder why can't we directly save the same effect with JPG output.
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