I tend to have the most success with high followed by uniform, but that may because I use it more often for underexposed subjects than overexposed. Sometimes all three options simply generate garbage. The filter offers three options, uniform, low, and high. I also find this usually improves the results as well.Īfter scaling the image to the desired size, then I attempt a run of the retinex filter. Due to the limited RAM and CPU clock speeds on the machines on which I work, I always scale the image before attempting a retinex. As a last resort, if the image is worth the effort, I will try the retinex filter. When a picture is backlit, or the subject is dark against a light background, setting a white point on the subject overexposes the background. Only once in thousands of images have I found setting the black point to be useful, and the gray point would require a neutral true gray photo-card be placed in the image. I often find I accidentally click on the Preview hot spot and turn-off the preview mode, so I have developed a habit of calling Levels back up from the programs tool bar at the bottom of the screen.
Gimp crop windows#
Be careful: when working on a small monitor you might have to use the Windows program task bar at the bottom of the screen to find the dialog box. Beware: if the object is not actually white, the whole image will color shift.Īfter choosing the white point, find the Levels dialog box and click on OK or the image will revert. Find a white object, or something that is supposed to be white. In GIMP, click on the button circled in red in the image below. When auto-balance does not produce the desired results, I usually next turn to adjusting the white point. The next version of GIMP, 2.4, will see a change wherein any corner can resize the crop area.Īuto-balance is available from the menu Layer: Colors: Levels. In the current version the upper left and lower right corners of the crop change the crop size, the upper right and lower left move the whole crop. When working with lots of images, short-cut keys are useful. When I first open an image I usually either crop and auto-balance, or auto-balance and then crop.
Gimp crop software#
This page is aimed at this sort of experienced user of editing software who just needs a couple starting points in GIMP. A couple faculty noted they were also working in GIMP and were unaccustomed to where the tools were that they had in Adobe Photoshop. Over time I have developed a routine that lets me work my way through up to a hundred images in an evening using GIMP as my editor. GIMP: Auto-balance, white balance, and retinex GIMP 2.2: Auto-balance, white balance, and retinexĪfter a college function I need an efficient way to slog through the photos and find images worth preserving from the event.
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