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3. More on Curves

We are now ready to start adjusting our image's Curves. Press CTRL + M or in the menus select: Image > Adjustments > Curves.

What you are seeing now is the Curve's Interface. The Curves interface allows you to edit the values of all the color channels at once or one at the time. The number of channels available are dependant on your color space setup (CMYK or RGB).

The curves values range from 0 (Black) to 255 (white) for RGB and from 0 to 100% for CMYK. Pressing the white and black opposing arrows on the interface will reverse the intensity.

As you can see our Graph is a 2 dimentional graph with the horizontal axis being the current pixel intensity (Input) and the vertical axis shows the resulting color values (output).

The color pickers on the lower right of the Curves interface allow you to set your white, gray and black points to be able to clamp your levels of intensity.

For the purpose of this tutorial we will be focusing on the RGB options:

Because our image has a large amount of color and we want large amounts of control, we will adjust one channel at the time.

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