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Reset curve. Resets the current on-top edit curve to the initial default, single straight line from 0,0 to 1,1.
Reset all curves. Resets all curves to their initial defaults.
Auto-set max input. Sets the maximum input to the maximum floating-point value in the input image (thus moving the horizontal knob location).
Set max output from input. Sets the output range to be identical to the input range, typically after an Auto-set max input operation. Often you will want to map all values to a 0..1 range. But if you want them to have the same range as initially, then you’ll want to use this operation.
Write Kurves cubemap. Writes a 3D color LUT map solely based on Kurves, in contrast to the Save button on the Image Preprocessor’s Color tab, which writes
a LUT based on all the level and color settings. If Kurves is doing all the color adjustments, this option can produce a more accurate LUT with detailed 1D LUTs for RGB and a 3D LUT for the overall luminance and saturation channels.
Copy Y to RGB. Copies the luma curve to the R, G, and B channels, enables them, and disables the luma curve processing. Useful when you’ve set an initial luma configuration but need to adjust the color further.
Copy to Luma/Red/Green/Blue. Copy from the on-top edit curve to the respective other channel.
Copy from Luma/Red/Green/Blue. Copy the respective channel to the on-top edit curve.
Undo. Undo the last operation. Can’t go past the opening of Kurves!
Redo. Redo the last undone operation within Kurves.
Enable saturation. Turns on or off saturation detection, which looks for a single large peak that is crushing the rest of the (auto-scaled) histogram.
No filtering. Disable histogram filtering; data is presented raw so missing values will be apparent.
Low filtering. Perform a small amount of filtering, for data that is already relatively good.
Medium filtering. Performs a useful default amount of filtering, definitely smooths out the curves, and can fill the holes on typical 8-bit to 8-bit curves even with moderately sharp slopes.
High filtering. Even higher filtering, for serious saw-tooth-filling power.
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