![]() ![]() See the note above on the influence this setting has on the preview vs the saved image. This control gives meaning to the difference between "local" and "global" contrast the greater it is the larger a detail needs to be in order to be boosted. If set to zero tone mapping will have an effect similar to unsharp masking. ![]() ![]() The greater it is the more likely an illumination change is to be considered an "edge". This parameter affects sensitivity to edges. Gamma moves the action of tone-mapping to shadows or highlights. As of version 4.2.156, as you increase the strength, shadows are raised and highlights are slightly lowered in a way which aims to preserve the average luminance of the image thereby preventing the washed-out look. This controls the strength of the overall effect. Remember that if you zoom the preview to 100%, it will perfectly match the saved image regardless of what slider values you use. An easy way to simplify this task is by setting an image viewer as the " External editor", then you just hit the keyboard shortcut Ctrl+e to have RawTherapee fully process the image and automatically view it in your image viewer. If you wish to adjust these values, you will need to process the full image every time you change them to make sure that their effects on the saved output are what you had in mind. These values generally lead to good results and a preview which quite closely matches the saved image. The default values for this tool are Edge Stopping=0.5 and Scale=0.10. The side-effects of this are that the zoomed-out preview may not match the saved image, depending on the " Edge Stopping" and " Scale" sliders. Processing a 900圆00 image is much faster than processing a 7360x4912 one, for instance. To keep the preview fast, RawTherapee feeds each tool with the image you see in the preview at the same resolution as the preview, not the original, huge one (however, when you save an image, it uses the original, huge one, which is why saving takes longer). The effects of this tool highly depend on the size of the input image in the engine's toolchain. Using this trick, the preview matches the saved image very well. ![]()
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