Command entry:Tools menu Viewport Canvas Activate any paint tool or click Layers Dialog. Layers dialog Menu bar Adjust menu

The Layers dialog Adjust menu includes commands for processing the entire image. Most commands open a modal dialog with a Preview option, but Auto Levels and Invert have no parameters and take effect immediately.

Brightness/Contrast/Hue/Saturation

Opens a dialog with controls for adjusting the following settings:

• BrightnessAffects the brightness (value) of the entire layer. The highest value, 100, makes the layer completely white, while the lowest value, -100, makes it black.
• ContrastAffects the contrast of the layer. Higher values tend to result in fully saturated colors, bright whites, and deep blacks, while lower values tend toward an overall gray tone.
• HueRotates areas of colors through the color spectrum. Does not affect shades of gray (including black and white).
• SaturationHigher values tend toward “purer,” or brighter colors, while lower values tend toward shades of gray.

Levels

The Levels controls in Viewport Canvas work the same as the Levels controls in most paint programs.

• BlackAffects mainly the darkest areas in the image. Raising the Black level makes the overall image tend to become black.
• WhiteAffects mainly the brightest areas in the image. Lowering the White level makes the overall image tend to become white.
• Mid Tones OffsetAffects mainly the areas in the image that are not black or white. Raising the Mid Tones level makes the image tend to become black, while lowering it makes the image tend to become white.

Color Balance

Adjusts the overall coloration of the image.

• Cyan - RedAdjusts the image color between cyan and red.
• Magenta - GreenAdjusts the image color between magenta and green.
• Yellow - BlueAdjusts the image color between yellow and blue.
• Shadows/Midtones/HighlightsSpecifies whether the color adjustments affect the darker, in-between, or lighter portions of the image.

Auto Levels

Attempts a “best-fit” adjustment of the image brightness, contrast, saturation, and color balance.

Invert

Converts the color of each pixel to its spectral opposite by subtracting the RGB values from 255. So, for example, red becomes aqua (blue-green), blue becomes yellow, and so on.