midtones, and highlights. The command converts an entire image to shades of gray without changing the image mode. To desaturate an image 1 Select one or more paint objects to desaturate all the images. You can select an area in one image in edit mode to desaturate the selected area only. If you don’t make a selection, the entire image in edit mode is affected. This command works with paint objects in RGB Color mode, CMYK Color mode, and LAB Color mode. 2 Choose Image > Adjust > Desaturate. Adjusting brightness and contrast You can adjust the brightness and contrast of an entire image or spe- cific channels with the Brightness/Contrast command. Brightness refers to the lightness of an image. Contrast is the difference in brightness between two pixels. Because the Brightness/Contrast command adjusts all pixels equally, you should avoid using it to lighten an image that appears too dark, because the image can lose shadow detail. To preserve shadows or highlights when adjusting the brightness of an image, you can use the Levels or Curves commands. See “Levels” on page 34.689 and “Adjusting brightness curves” on page 34.691. To use the Brightness/Contrast command 1 Select one or more paint objects to adjust all the images. You can select an area in one image in edit mode to adjust the selected area only. If you don’t make a selection, the entire image in edit mode is affected. This command doesn’t work with paint objects in Black & White mode or Indexed mode. 2 Choose Image > Adjust > Brightness/Contrast. 3 Enter a Brightness value from -100 to 100. Higher values can wash out midtones and shadows. Lower values can dull highlights. 4 Enter a Contrast value from -100 to 100. Increasing contrast moves the color values of pixels to the extremes of the brightness spectrum. Decreasing contrast moves color values toward medium gray. 5 After entering the settings you want, click OK.
Canvas 8 Help: Image adjustment and correction (6 of 24)                                            Page #688