The first thing to do is to click the point at the top right of the curve with the left mouse button and move it to This empty space is marked with a red dotted line on the image just below. Increase the highlights, eliminating the empty histogram part on the right. First of all, let's start with some practical examples: the photo is rather underexposed, therefore we need to How the curves act on the different areas of the image and histogram. Later I'll do some other examples and finally I'll explain better Now let's try to correct the brightness and contrast of our photograph using the Gimp curves. ![]() To leave the curve type as Smooth and leave the Preview Box checked, to see the result of the changes in real time. With a light gray histogram on the background and the two bars left and down, that remind us that the shadows are on the left and bottom, while the highlights on the right and top.Īt the top there is a dropdown menu, called channel with the parameter Value selected, we will always and only work on this channel, but if you preferĪ most advanced personalization, it is possible individually correct the curves of red, green and blue channels, for example to fix the dominant colors. The window that will open, will be very similar to the one you see below, Let's open the Gimp curves tool, by going to Colors → Curves. These are the cases where curves becomes the best tool. For example, if we want to increase the contrast and lighten the shadows, without however changing the values of the mid tonesĪnd without burning out the high lights, it would be impossible. This allows us to have more control, we can also modify the middle tones, but it remains a solution limited by the fact that weĬan only work on three parameters. In fact, we cannot work on the medium tones of the photograph, since the contrast acts only at the edges of the histogramĪnother way to proceed is to manually adjust the color levels on the histogram,Īs explained in this tutorial. The second is that, using only the contrast slider, we are very limited.The first is that we are going to eliminate a part of the detail of the dark tones, as highlighted by the red arrow on the left in the image below, with consequent burn out of some shadows.The result is graphically represented by the image below, where we are "deleting" the red bars. In this way, by adjusting a simple slider, we can easily increase theĬontrast "tightening" the histogram in a super easy and automatic way. A more detailed explanation is available in this basic tutorial. Just openĬolors → Brightness-Contrast and increase the value If we want to increase the contrast of a photograph there are different ways to proceed: the first, the simplest of all, is to increase the contrast. ![]() It can in fact be noted that the curve is actually a perfectly straight white line.Ĭontinues after the ad. To get started we use the default parameters of the curves tool, If you are not sure to know what we are talking about, we recommend to read this tutorial before proceeding.Ĭolor curves adjustment, however, have a huge advantage in exposure correction compared to color levels: curves allow us to raise the contrast without going to burn out the high or low lights.Īs first image, we will use a dark photo with a strong lack in the highlights (highlighted with the red arrow). To fully understand this tutorial you need to know how to read the histogram and how to adjust the color levels In any different program, however for these examples has been used Gimp. This guide is valid for any photo editing program and RAW image processing software, as the curves work in the same way This tutorial has been created to explain to all those who approach graphics and photography how to correct the exposure and contrast of an image I'm not exagerating, it's a game changer tool. Knowing how to setup a curve should be a mandatory skill for anyone Gimp tutorial: how to use curves for advanced exposure correction An explaination on how to read and use Gimp's curves tool: in this tutorial we will learn the most advanced tool to change the exposure of your photos.Ĭurves tool, in my opinion, is the most powerful and helpful tool that Gimp offers.
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