Monday, March 14, 2011
1. To change brightness and contrast for an entire image, or for a selection, choose Image > Adjust > Brightess/Contrast. Drag the Brightness and Contrast sliders to the right or lift, or enter a value in the entry boxes (-100 to +100). OK the dialogue box.
2. If you are making adjustments to a selection, click the preview button to see, on screen, the result of the settings you choose.
3. Choose Image>Adjust>Auto Contrast (Ctrl/Command + Alt + Shift + L)to automatically adjust the contrast for an image or sele ction. Highlightes should appear lighter the shadows darker resulting in an overall improvement in the image. Auto Contrast dose not adjust individual channels in an image. It makes highlightes appear lighter and shadows darker by mapping the lighter and darkest pixels in the image to white and black respectively.