Brightness curve transformation : full capability of multipass sharpen ...

[pierrelabreche]

• add preview window
• display numerical values of before and after of the brightness point being adjusted
• Adding a point to the brightness curve should have immediate feedback to the curve rather than being added after computing mean image
• Add blur threshold and sharpen threshold (black and white) slider controls

[jsachs]

Adding a preview window would make the transformation more awkward to use and in most cases is unnecessary.

The use of the mean image in brightness curve is not the same as in sharpening as it is simply used to separate the image into high and low pass versions.

Adding a point does not trigger a recalc of the mean image, although I did find a couple of cases where there were unnecessary calls to mean image and fixed them for the next release. When editing an advanced mode brightness curve transformation, the first time you make a change to anything, it needs to recompute the mean image (unless the detail or radius settings would ignore it anyway) since this is not stored once the transformation is closed.