Hi ART forum
I seem to have a a Flat Field issue in ART which was resolved the last time I ventured into DNG editing. The issue was actually with RT (as I didn’t really know ART then) as you can see here Huawei DNG files and flat field correction in rawtheapee produces a purple vignette [solved] - #11 by Mint. In short agriggio Alfredo quickly solved it and the solution was picked up by heckflosse Ingo Weyrich at RT. So back then both ART and RT could do Flat Field correction without any strange magenta/purple hues. Now I am trying to give RAW editing another go and I settled for ART because I find the GUI less intimidating then RT (and I really like you can turn the modules on and off so easily) and Darktable seem to freeze and crash a lot. However when I try to use my Flat Field correction files (DNG) in latest ART 1.14 from Apprepo - AppImage: ART now strange things occur. If I test my Flat Field DNG on it self, the result should be a completely flat white image. If I test it with RT latest 5.8 Dev (Release Automated Builds · Beep6581/RawTherapee · GitHub) that is exactly what happens. If I do the same in ART the test gives a white image but with a dark uneven ghost like area in the middle. This happens even if the module is not turned on (which is double peculiar because without asking ART for anything it does something). In RT if you don’t ask for FF correction you can see the dark greenish corners as you’d suspect. Now if I manually select the flat field DNG in ART then it sort of removes the corners but leaves and red/orange hue. So if it was sorted before in ART and the solution was implemented in RT and RT is working flawless but ART is not why is that?
Any suggestions? I suppose I could simply get over my RT fright and be done with it.
Screen shots for anybody who is interested.
Flat Field DNG
IMG_20200620_170726MAIN.dng (76.2 MB)