You will make your adjustments entirely in the Input Levels portion of the dialog.
#Gamma control in gimp full#
Most of the time you will likely want a full range of values to be represented in your final image, so you will leave the output sliders set to the full range (0 - 255). The two sliders here are for the darkest and brightest values in your final output.Īuto, Pick Levels - The auto button, and the pick droppers for manually choosing where the different points should be in your image. Output Levels - The range of values you want in your final image. The far left slider adjusts where you want the darkest pixel values to be, the far right is the brightest pixel value location, and the middle slider is for gamma. There are three sliders just below the histogram. The histogram represents the distribution of pixel values across your entire image from black (left) to white (right). Input Levels - The range of values you want from the original image.
![gamma control in gimp gamma control in gimp](https://www.linuxtopia.org/online_books/graphics_tools/gimp_advanced_guide/img206.gif)
Let’s have a look at the Levels dialog to clarify some items: If you don’t adjust the middle level control, the response is linear across your image values.
![gamma control in gimp gamma control in gimp](http://what-when-how.com/Tutorial/topic-3179g050h6/Beginning-Photo-Retouching-and-Restoration-Using-GIMP_images/img-gen286.png)
This means that you can control the brightest and darkest pixel values across your entire image using only the Levels slider, and you can adjust the gamma. (Color correction should be approached using other methods). I say brightest/darkest because Levels will allow you to change the relative value of pixels across your image. What Level Adjustments will do is allow you to change where the brightest and darkest pixels in your image are. Original image by Alexis O'Toole on Flickr. Original image by Danielle Scott on Flickr. If you were just interested in basic level adjustments, I thought I would cover that here. What I may not have mentioned in that post was that the process described will actually level balance your images for you automatically if you follow the steps (choosing the darkest and lightest pixel values to represent black and white in your image). In my previous post on Color Correction, I outlined a method for finding the lightest and darkest values in an image using Colors → Threshold.
![gamma control in gimp gamma control in gimp](https://1.bp.blogspot.com/-_LZPLjkvpYk/Xs20I5C2Q1I/AAAAAAAAZsc/o8PUdA9GaKk7frxLZkKmhOIcBky-x6XjwCLcBGAsYHQ/s1600/Moon16pt8pc.png)
5 min read Getting Around in GIMP - Adjusting Levels