Adobe Photoshop CS2 CLASSROOM IN A BOOK [Electronic resources] نسخه متنی

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Adobe Photoshop CS2 CLASSROOM IN A BOOK [Electronic resources] - نسخه متنی

Anita Dennis

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Removing a color cast


Some images contain color casts (imbalanced colors), which may occur during scanning or which may have existed in the original image. This photograph of the window has a red cast. You'll use the Auto Color feature to correct this.

Note

To see a color cast in an image on your monitor, you need a 24-bit monitor (one that can display millions of colors). On monitors that can display only 256 colors (8 bits), a color cast is difficult, if not impossible, to detect.


1.

Choose Image > Adjustments > Auto Color.

The red color cast goes away.

2.

Choose File > Save.



About the Auto Color and Auto Correction commands


The Auto Color command adjusts the contrast and color of an image by searching the actual image rather than the channel histograms for shadows, midtones, and highlights. It neutralizes the midtones and clips the white and black pixels based on the values set in the Auto Correction Options dialog box.

The Auto Correction Options dialog box lets you automatically adjust the overall tonal range of an image, specify clipping percentages, and assign color values to shadows, midtones, and highlights. You can apply the settings during a single use of the Levels or Curves dialog boxes, or you can save the settings for future use with the Levels, Auto Levels, Auto Contrast, Auto Color, and Curves commands.

To open the Auto Correction Options dialog box, click Options in the Levels dialog box or in the Curves dialog box.


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