This Enfocus PitStop command allows us to apply a curve to the channels of RGB mode objects (any type of RGB is supported: uncalibrated, calibrated and with an ICC colour profile) selected within a PDF. It does not affect objects defined in another colour mode, even if they are selected.
If nothing is selected, it will affect all susceptible RGB objects.
The visual curve tool works same as that of any similar program (Adobe Photoshop, etc.).
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