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When activating the Tone Curves effect, either from the <Editing> drop down in the Recipe panel or by pressing [T], you will be able to customize the curves of the loaded image.
This effect offers you full control over the curves in the image. You can change curves per channel (Red, Green, or Blue) or combined for the RGB channel. Each activated channel will get its own "curve" (the line in the grid). As you can see in the screenshot above, only the RGB channel is activated and you see the curve for this channel as a gray line. The line for the Red channel is Red, Green is Green and Blue is Blue.
Notice the handles on the curve in the lower left, middle, and upper right of the curve. You can drag these handles and the curve will be drawn through these control points. The image itself is then changed to represent the new curve for that channel of the image. This is very powerful. If needed you can add more handles to the curve. To do so, right click on the position in the curve where you'd like to add a new handle and then add a point.
In this curve I have dragged the lower left corner to the right and the upper right corner to the left. This will increase the contrast of the image as the shadow colors (lower left) will be compressed to a smaller range, while the highlights (upper right) are compressed too. It is best to play with it a bit and see how changing the curves will change your image tones.
The upper part of the Tones dialog displays a "Presets" drop down. IDimager comes with a few pre-defined curves that you can easily apply to your image. It is of course also possible for you to create your own curves and store them as presets. Do that with the <Add> and <Delete> buttons that are located to the right of the Presets drop down.
To apply a preset you simply select it from the drop down. As you select it, it is possible to change the curves by simply repositioning its handles.
Here's the curve for the "Cross Processing" preset. This curve will create an old-style and faded Polaroid effect which is quite popular these days.