![]() ![]() N/A (possibly similar effect with surface blur?)Īs you can see, there are roughly 23 modules in darktable that have no dedicated equivalent in RawTherapee. N/A (effect can be achieved with Detail > Contrast by Detail Levels)Įxposure > Vignette Filter, Transform > Lens / Geometry > Vignetting CorrectionĪdvanced > Wavelet levels (can be used for many things)ĭifferent implementation, more flexible as it is available in many modules through masks N/A (similar effect can be obtained with RGB Curves)Įxposure > Auto-Matched Tone Curve (works differently, intends the same) N/A (maybe Color > Contrast by Detail Levels)Ĭolor > Channel Mixer (much less advanced) Transform > Lens / Geometry > Perspective (Method: Camera-based)Įxposure > Shadows/Highlights (not identical)Īdvanced > Color Appearance & Lighting (this module is much more advanced), Color > Color Management > Abstract Profile (similar intent) Transform > Lens / Geometry > Chromatic Aberration Correction Transform > Lens / Geometry > Profiled Lens Correction Raw > Raw Black Points, Raw > Raw White PointsĬolor > Color Management > Output Profile If not, you won’t get good results.īe aware that this tool is like a double-edged sword, so there will be times where you won’t get good results, no matter what.Transform > Crop, Transform > Lens / Geometry > Rotate With a good translator and playing with RT at the same time, you shouldn’t have many problems understanding it.Īnd thinking about your astro images problem, perhaps you should pay special attention at the third practical example and understand what’s happening in full. If I may, I would recomment that you read the Spanish RawPedia page about Defringing. ![]() If you definitely follow the defringing path, you may have to learn quite a bit how that tool works in RT, as it is wonderful, but also very picky. In my pp3 the Noise Reduction tool is active with default values, meaning that it won’t remove any noise but color noise. Then you may wish to completely avoid the Impulse Noise Reduction tool, as it removes the tiniest stars, as well as creates artifacts in bigger stars (darker pixels in the center of the star). I’m only now starting to suspect that I may have received this lens as a gift because the previous owner dropped it. That said, I will download the pp3 and have a look.Īnd you are correct, there is definite unevenness, which is why I went down the tilted-lens rabbit hole. That said, I do not play with exposure/contrast here, that occurs after I stack multiple shots (in Siril), then postprocess and noise reduce with StarTools (all this to avoid Photoshop!). ![]() I will try the non-lens specific, the shots are different but they are the “same”, in that the camera is on a tracker, so only pixel level differences, noise, sky condition are different. A legitimate small red or blue star might get defringed into white. Indeed Jade_N, there is likely a trade-off between de-fringing and star color. Ah I suppose that means that no one entered the data for a full frame camera. It does indeed raise a flag about crop factor used for lens profiling larger than that for current camera. Thanks for your rapid input folks! The supported lens, 300mm f/4 IS USM, is there when I search down the Canon list. I measured the tilt of the lens using Samuel Chia’s running track method, and just today shimmed it, and I get to test it tonight, first clear night in a month, no joke worst cloud on record. Persnickety folk will notice that the aberrations are not uniform. Since you’re here, are there RT methods to disaberrate (ooh, a new verb!) the radial stretch? Geometry seems to do a bit of it, but may not be the right tool. I’m new to defringing, so hard to tell how strong to go. It was only after I got home that I realized that it was at f/4.5 instead of the 6.3 I usually shoot at, so there is a fair bit of color. Here is a folder holding a Canon CR2 and the associated pp3 should have done that off the bat, apologies: I did not do any sharpening at this stage (being aware that deconvolving often produces dark ring halos, though I’ve never done that). Thanks folks, your wisdom/experienced is much appreciated. ![]()
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