Remove moire in ART

[Iain]

I’ve done some experiments in GMIC to detect and remove moiré, but I don’t have the skills to translate from GMIC to other software.

New Demosaicing filter

I’ve added IID Demosaicing to Testing>Iain Fergusson IID is a demosaicing algorithm that produces good colour detail and works well in the presence of chromatic aberrations. It attempts to reduce moire patterns. Noise tends to render as a maze like texture. False colours around edges will need post processing. It does NOT include the algorithm to remove moire that I posted about a while ago. I wanted to keep things simple so I could actually get something finished and be able to share it. [im…

Detect Moire Filter

I’ve just added a “Detect Moire” filter to Testing → Iain Fergusson. [Detect_moire] It’s a problem I’ve been trying to solve for a while and I was inspired to revisit it by the recent work done to combine demosaicers in Raw Therapee. It’s pretty good at detecting moire on low ISO images, high ISO images require a bit of fiddling to make sure noise is not causing false positives.

Demosaicing Experiements

I’ve been playing with demosaicing, and since my shooting style seems to promote moire and aliasing I have been especially interested in reducing it. Here it is compared to LMMSE. LMMSE is on the left. [image] it works by first, demosaicing the image twice. On one the green channel is interpolated horizontally, the other vertically. Then the G-R and G-B is interpolated. This gives two very different moire patterns for each image. Then I choose which part of each image has the least chroma …