Some darktable modules create hot pixel "sparkles". Is this a bug, or am I using it wrong?
Photography Asked by growse on May 24, 2021
I’m just getting started with Darktable 3.0.0 processing some RAW files out of my Canon 6D MkII.
One odd thing I noticed is that some of the modules seem to create hot pixel-like “sparkle” artifacts when using them. Here’s an example:
This particular example comes from using the “Haze removal” module and pushing the strength upwards. Below about 0.10, they seem to disappear, but I’ve not checked everywhere. I’ve also seen this using the equalizer module. These artefacts persist even when exporting to PNG or JPEG.
Is this a bug? Or am I using it wrong, and it’s an artefact of something else?
One Answer
This sort of bug is usually caused by some computation getting truncated to fit within the range that can be represented by whatever data type they are using — likely an integer over/underflow, or perhaps an improper use of unsigned integer values at some point in the computation. It is almost certainly a bug, though it may or may not be an easy bug to fix, depending.
Answered by dgatwood on May 24, 2021
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