Common Image Color Adjustments
Image color adjustments are performed with filters via the filters window. Filters can found by going to the ‘Filters’ menu item, using keyboard shortcut Shift-Command-F (⇧⌘F), or clicking the filters button at the top right of Acorn’s window.
Saturation
Adjust the intensity of color in your image. Filter ▸ Color Adjustment ▸ Color Controls
Brightness
Adjust the darkness or lightness in your image. Filter ▸ Color Adjustment ▸ Color Controls
Contrast
Adjust the difference between the lights and darks of your image. Filter ▸ Color Adjustment ▸ Color Controls
Exposure
Adjust how much light is exposed, similar to film or sensor when taking a photo. Filter ▸ Color Adjustment ▸ Exposure Adjust
Hue Adjust
Adjusts the color of your image, leaving black, white, and gray alone. Filter ▸ Color Adjustment ▸ Hue Adjust
See also: Color Adjustment Filters
Curves
Adjust an image’s shadows, highlights, and mid-tones including red, green, and blue. Filter ▸ Color Adjustment ▸ Curves
See also: Curves
Grayscale
Adjust your image to black and white, or varying degrees of grayscale. Filter ▸ Color Adjustment ▸ Grayscale
See also: Black & White
Levels
Control the black, white, and mid-tones of the layer. Filter ▸ Color Adjustment ▸ Levels
See also: Levels
Filters in Acorn are non-destructive by default, meaning they do not permanently alter your image. To change the value of a filter later, just return to the filters window by double clicking the 'fx' next to your layer in the layers list. Your filters will save with your image for later editing if you choose the .acorn file format. If you wish to make a filter effect permanent, or destructive, click the 'Flatten' button located at the top of the filters window. Once you have flattened a filter, you will no longer have the ability to modify it and the 'fx' will disappear from that layer in the layers list.
See also: Filters