![]() to make the horizon in an image appear straight. The Hugin program is also useful to perform remappings of images, e.g. Hugin is a panorama stitcher, it has executables like align_image_stack and enfuse that you can use separately as command line programs to align image stacks, to create HDR pictures or to perform focus stacking. It allows you to perform arbitrary mathematical computations involving any arbitrary set of images using the macro language that is easy to use. It can handle all image formats from 8 bit to 32 bit images. ImageJ is a low level powerful photo editing tool. computing the average of many aligned noisy pictures, a command line tool is more useful than a GUI. If you need to work with a large number of pictures e.g. ImageMagick is a useful command line for photo editing tool. you may want to run your own demosaicing algorithms, you then need to use DCRaw to covert your RAW file to a TIFF file that contains only the raw sensor data. I use the following programs:ĭCRaw for converting RAW files to the format you want. There is no single free of charge program that will allow you to do everything that Photoshop can do in a practical way. It will allow for arbitrary color representations.Ī good free of charge alternative to Photoshop will involve using at least a few different programs. The future versions of Gimp will have a much more flexible color model: Plates. But you can decompose the image into separate compontents, process them and re-compose them back. ![]() See how to reate an oil painting from a photo in Gimp and Sketch effect.Ĭurrent version of Gimp (2.10) doesn't support color spaces different from RGB (e.g. I never use them, but there are many filters like this and tutorials how to do it manually. transforming the picture so it looks like a painting. There is also a special Foreground Select tool.Īnd tools to transform a pictures completely, e.g. Yes, there are several ways to remove or replace background. Also quality resizing, rotation, perspective correction etc.Īnd also have tools to merge new backgrounds Fix colors? - check (not the strongest side of Gimp, though, it's better to have a RAW file around). Denoise? - check (not the best in the world, but Wavelet denoise is very usable). Sharpen? - check (see Unsharp mask and Refocus, edge only sharpening is also available). Levels, curves, brightness, contrast? - yes, Gimp can do it. What I am trying to do: Ideally I would like to manipulate pictures to enhance them, Also even if it may sound unexpected, I like the interface of some of its tools (e.g.
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