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7. The Menus / 7.6 The Tool Menu

### 7.6.39 Curves

The tool Curves adjusts all or individual color channels of an image.

The sliders Brightness, Contrast and Gamma allow you to change these attributes in a simple way.

The curve fields change the color channels in a more sophisticated way. The curve of the active curve field can be modified in the large curve editor (see also chapter 3.7). The first curve field affects all color channels, the other ones only the given channel. It is possible to drag a curve to another curve field. Aside from the native color space of the image the channels can also be edited in Lab and HIS, if the image is RGB, CMYK or Lab.

If the Shift key is pressed when moving a curve point, the point is only moved vertically, with the Alt key the point snaps to the grid if it is close to it.

By selecting the white, black or gray pipette you can set a white, black and gray point. If the gray pipette is active and you are clicking to a place in an image, that should be 50% gray, PhotoLine automatically calculates the corresponding curve. It is possible to do the same with black and white. You can reset the gray point by assigning a transparent color.

Picking a color in the document window or the dialog preview will create a corresponding point in the curve. Dragging edits the newly inserted point. Holding Ctrl (Windows) or Command (macOS) will create a new point in the curves of all color channels.

File saves and loads the current settings.