Request for new tool
In December of 2018, I asked for a new tool to be added to the Photoshop tool kit. A few people replied with advice about how to use the existing tools. I've followed some of that advice. It has helped a tiny bit, but only a tiny bit. I think the tool I want would be a little more complicated than the blur tool, but less complicated than the spot healing brush.
I asked on another forum if it was possible to modify an existing tool, such as the Blur tool, myself, and was advised by Chuck Uebele that it isn't.
I've surfed the add ons thoroughly and bought and used SRDx and one other whose name I've forgotten. These aren't obviously better than the Photoshop tools, except perhaps for a few cases for which they've been optimised.
When using the Blur tool to repair a blemish, it is usual to make the tool significantly bigger than the blemish, so good pixels will outnumber bad pixels. Because the Spot Healing Tool algorithm looks outside the area to be repaired to find good pixels, it is possible and usual to make it just a whisker bigger than the blemish, to minimise the number of pixels changed by the repair.
The algorithm I think I need would have the look and feel of the Blur tool and use pixels inside, not outside the cursor, but would interpolate like the Spot Healing Tool instead of simply blurring.
In a little more detail, pixels near the edge of the cursor would contribute the information for the interpolation and not be changed; pixels near the centre of the cursor would contribute no information to the interpolation, and be changed by that interpolation.
The Blur tool with a suitably soft brush nearly does this, but doesn't ignore the pixels forming the spot and seems not to use interpolation, but just simple averaging.
Curiously, the algorithm I propose might be easier to implement and might produce better results for scratches than for simple spots. For a scratch, the interpolation can be along a line perpendicular to the scratch, not over a circular area.
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