3-24Processing RAW ImagesTone CurveA tone curve shows the brightness and color saturation for the original image (input) and theadjusted image (output) in the form of a line graph. You can use the tone curve to adjust theimage brightness and color saturation values that were set by the camera when the shot wastaken. Also, by using the tone curve to adjust an image, you can tailor the image to theparticular color reproduction characteristics of your monitor or printer so that you obtain themost faithful color reproduction.The tone curve adjustment options include [RGB], which adjusts the input and output for theentire image in a single operation, as well as the [Rch], [Gch] and [Bch] settings that adjusteach color individually. You can use the [Tone curve settings] list box to switch between thedifferent channels as you make your adjustments.The horizontal axis shows the brightness and color saturation for the unadjusted (input) image,with the left-hand end indicating shadow (darker areas of the image) and the right-hand endindicating highlights (brighter areas of the image).The vertical axis shows the brightness and color saturation for the adjusted (output) image,with the lower end indicating shadow and the upper end indicating highlights.
