![]() For more on reading histograms, see this article: Stop Exposure Problems Ruining Your Shot. Pure black is the very left edge of the histogram area, and pure white is the very right edge. If you look at the Histogram for the image, you can see that we have no pure black tones and no pure white tones. ![]() Now, onto some real-world uses for Levels. Hopefully the above helps to show the relationship between the input levels and the output levels though. So normally you will want to leave to leave the output slider levels as they are. How often do you have an image where you want black to appear brighter than black (or white darker than white)? Not very often, if at all, I suspect. Moving it down means white and bright tones are mapped to darker tones, resulting in an image that is darker with less contrast. For the white output slider, the situation is similar. With the black output slider moved to 27:Īs you can see, changing the black output level brightens the image and lowers the contrast. All values above black would also be shifted up in brightness accordingly.įor example, here is an image with no adjustments: to value 27), black in the image would then be mapped to the new, brighter, value of 27. If you moved the black output slider up (e.g. (The values range from 0 pure black to 255 pure white). So, for the image above, Levels is mapping black in the image (value 0) to black (value 0). The black input slider maps black to the value of the black output slider. First we will cover the output slider, though you should have little need to modify it in real use. If you want to follow along with the examples in this article, you can download the images used here: image-1.jpg image-2.jpgĪbove is a description of part of the Levels tool. Levels is slightly simpler than curves in that it only allows you to adjust the black point, white point, and mid point, whereas curves will let you adjust those and any point in between.įor this article, I'll be using the levels tool in Photoshop CS5, but the levels tool in Photoshop Elements, Paintshop Pro, GIMP, etc. The levels tool is similar to the curves tool, in that it allows you adjust the brightness / darkness and color of the tones in your photos.
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