•   The Histogram command can be applied to paint objects in edit mode only. •   Many commands in the Adjust submenu can be used to uni- formly adjust one or more selected paint objects, or a paint object in edit mode. Working with image-adjustment dialog boxes Some dialog boxes for image-editing commands include histograms and preview options to help you achieve the effect you want. Understanding histograms A histogram plots the relative number of pixels in each brightness level in an image. In the histogram above, shorter bars on the left indicate that the image doesn’t contain large areas of very dark pixels. Higher bars toward the right of the graph show that the image does contain large areas of medium and very bright pixels. To view an image’s histogram at any time:  With an image in edit mode, choose Filter > View > Histogram. Using the Preview option Most dialog boxes for image-adjustment commands include a Pre- view check box. Select the Preview option to see how settings affect the image. Preview is available only when a single paint object is in edit mode. Brightness levels Amount of pixels Minimum (0) Maximum (255) More Fewer Tip (Mac OS only) When working with large imag- es, you can improve speed by using video LUT animation instead of previews; see “Paint- ing preferences” on page 15.224.
Canvas 8 Help: Image adjustment and correction (2 of 24)                                            Page #684