![]() ![]() ![]() This usually involves a little bit of tweaking to improve on what could be obtained directly from the camera. I develop raw with DPP just to have a base of comparison. ![]() This is spot on when it comes to my own findings. “More cowbell” is not universally appreciated… On top of that, and can describe this more succinctly, capture sharpening has other logic to selectively apply it across the image, and that logic can differ software-to-software. If that’s the slider you’re presented with, the mapping of that slider to sigma and radius is rather arbitrary, and probably inconsistent software-to-software. Some raw processors present those two parameters for one to mess with, and those parameters can be pretty well carried from software to software as they’re anchored in a commonly understood math mechanism, the gaussian distribution.īut most folk don’t want to think of the math, they just want “more sharpen” or “less sharpen”. So, the relevant parameters to the gonkulator I described are in the blur operation, to which the relevant parameters are sigma, which in simplistic terms is the rapidity of the blurriness applied from the center pixel, and the radius, how far out should this blurriness be applied. The internal mechanics of USM sharpening work like this: 1) make a copy of the image and blur it 2) make another copy of the image and subtract the blurred image from it, then finally, 3) add the image from #2 to the original, and voila, sharpening!! You’re scratching the “semantics scab” of post processing… Sharpening definitely seems necessary but I have no idea if my similar intentions are being similarly applied when using the different applications. ![]() Right now I’m throwing darts and pretty wildly. I have had experiences where I’m unable to to get a better result with the other software. Therefore, a quick development with DPP is always done. I find DPP to be easier, primarily because there are fewer tools available. In addition to GIMP & RT I also use Canon’s Digital Photo Professional (DPP), which also has a USM tool and the same question arises with respect to the values it uses but I didn’t think it fair to raise that aspect of the question in this forum. When it comes to sharpening I have also read where it can be better to apply sharpening multiple times rather than simply increasing the amount in a single operation. While GIMP doesn’t do raw I frequently use it to do some post processing (crop, add borders, text, etc.) on photos produced from raw files developed by other programs. For this forum I thought it fair to compare GIMP with RT.Īs a novice I’m using several different programs to develop photos where I ultimately compare the results I get from each application. However, my question really has to do with how to compare what should be the same technique when performed using different software applications. I normally think of the raw tab as the beginning but I think you may be saying that it can still be used near the end of the process. It is my understanding that sharpening is something that should be last or near last in the development process. I’m a bit of a novice so please bare with me. Might someone be able to either shed some light on this discrepancy between GIMP and RT? Maybe reference some documentation that explains well enough to figure this out.Ĭapture Sharpening (Raw Tab) is NOT something I’ve yet tried but I welcome the advice. For example, how do the values in one program relate to the other? It seems like it should be possible to understand a equivalence relationship between the values being used by each program. It seems like there ought to be some relationship between the controlling parameters. I tend to leave Threshold alone and fiddle with Radius and Amount. Last they both accept a value for Amount where GIMP defaults to. Then both have Threshold where GIMP defaults to 0 but RT has a set consisting of 20, 80, 12. For example, they both use Radius where GIMP defaults to 3 and RT to. However, while both programs support the unsharp mask method (USM) and use the same terminology for describing the controlling parameters there is no similarity in the values specified for said parameters. Sharpening seems to almost always be useful. I’ve been using both GIMP and Rawtherapee (RT) to develop photos. ![]()
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