Curves adjustment

Settings

The following settings can be adjusted in the dialog:

• Select a colour mode (GREY/RGB/CMYK/LAB) from the first pop-up menu.
• Specify a single colour channel to apply the adjustment to, including the layer's alpha channel. Master (the default choice) applies the adjustment to all colour channels*, excluding alpha channel*.
• Picker—allows you to drag on the image to modify the adjustment. The initial click will place a node on the curve in relation to the pixel selected. Dragging up will lighten the image while dragging down will darken it. The curve graph will update accordingly.
• X—accurately positions any added and currently selected node on the X-axis of the graph.
• Y—accurately positions any added and currently selected node on the Y-axis of the graph.
• Min and Max are the input minimums and input maximums. These are useful for 32-bit documents with out of range tonal values, but can also be used to fine tune the manipulated tonal range in 8-bit and 16-bit documents:
  • Input minimum—specify, in float, a minimum value to use as tonal input.
  • Input maximum—specify, in float, a maximum value to use as tonal output.