![]() ![]() ![]() Then you left-click directly on the faulty spot. Select it, then hold and click to a place nearby the faulty spot that has the same color and texture. In the Toolbox window, you will find the Clone Tool. As long as they are small enough (a dozen pixels), they are easily correctable. Images often have small imperfections like hot/black pixels or flies, birds etc. ![]() It is also possible to brighten and darken only a region of the image. If you wish to increase or decrease saturation, go to Colors → Hue-Saturation and move the Saturation slider. You can also do this with the dialogue Colors → Brightness-Contrast, but with the Curves dialogue you have much better control. Then click on the curve, hold down the mouse button and drag the curve down until the desired effect is reached. To mitigate the dominating blue channel, open the Curves window again but this time select the blue channel. Move the start-/endpoints only inside the gaps between the corners and where the first values of the histogram begin, otherwise you will create artifacts. Take the upper endpoint of the curve and moved it to the right, then move the lower endpoint to the left. In the left picture below you see that the histogram is quite compressed which makes the image look pale and colorless. In this example, we “dehaze” the image and then lessen the dominating blue channel. Go to Colors → Curves where you have a window in which you can directly modify the histogram. Brightness and Contrastįor almost any picture I edit, I first modify brightness and contrast using the GIMP histogram. You can also set the aspect ratio in the Tool Options window once you clicked on Rectangle select in the Toolbox window. Once you have done that, go to Image → Crop to Selection and only the selected area remains. Then click into the image and drag to make a selection. ![]() To crop the image, you make a selection by choosing Rectangle select from the Toolbox. The next example shows a bent (left) and unbent (right) column: An example with original (left) and mitigated chromatic aberration (right) can be seen here: You can find your corrected image in a folder darktable_exported besides the original image. On the right, you will find export selected and click export. Now you can go to the lighttable tab where your image should already be marked. In the menu below, find lens correction and enable it by clicking on the small on-off button:Įspecially with cheaper lenses, you will notice a clear difference in the preview of the image. Below the histogram appearing top right, you will find this menu:Ĭlick on the button with the tool tip correction group. On the top right, you will find the tabs: The rest is fairly easy: You open the image with Darktable. If it is not detected, you may be able to select it manually. The program can detect your lens if you are using a common DSLR lens. Your lens has to be in the database of Darktable for the lens correction. Furthermore, it is more specific to photo editing, not general image editing. Unlike GIMP, it can deal with raw images. It is the open source equivalent of Adobe Lightroom. Once you shot the image, you often want to do lens correction to mitigate chromatic aberrations and barrel distortion. Later, I will provide additional tips and further reading. I will present a few common techniques when editing images to give you a starting point if you are beginning with photography or want to switch from proprietary software. It is meant as a motivation, showing that it is possible to live without the software counterparts that only work on Windows or Mac. Until now, I still have never used Photoshop or Lightroom for image editing and do not see the need to do so. Hence, I started using GIMP and later Darktable (and rarely Qtpfsgui for HDRs). I was reluctant to do so and really liked my Linux. Back in 2014, when I first bought my camera, I was told that I should buy Adobe Photoshop or Lightroom to edit my images which, in fact, would have meant going through the hassle of installing and using Windows on my Computer. ![]()
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