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Adjusting Tonal Range in GIMP

Adjusting Tonal Range in GIMP. BY: TJ Vines & Michael McGhee ITEC2110 2/22/12. What is this?. This tool is used to make an image lighter or darker, to change contrast or to correct a predominant color cast.

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Adjusting Tonal Range in GIMP

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  1. Adjusting Tonal Range in GIMP BY: TJ Vines & Michael McGhee ITEC2110 2/22/12

  2. What is this? • This tool is used to make an image lighter or darker, to change contrast or to correct a predominant color cast. • When using this tool, you can remove color tones like RED, BLUE, and GREEN. Also, you can alter both black and white points along with the overall brightness of the image.

  3. How do I use this? • You can get to this tools in several ways: In the image menu through Tools → Color Tools → Levels. OR: In the image menu through Colors → Levels.

  4. Original Image

  5. Tonal Adjustment

  6. What Are The Options? The first options allow you to set presets for tonal adjustment. The second option is the Channel which allows you to pick which value from RED, GREEN, or BLUE to adjust. Input Levels are used to lighten highlights (bright tones), darken shadows (dark tones), change the balance of bright and dark tones. Output levels allows manual selection of a constrained output level range.

  7. Review • Why would you adjust the tonal range? • What are the three color channels youcanadjust?

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