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Opacity is 'fill' level for brush. So a brush at 100% opacity will 'fill' at 100%.


So why then, does it take three brush strokes to reach maximum fill at 50% opacity (when logic says it should take 2), and seven brush strokes to reach maximum fill at 25% opacity (when it should take 4)?


Similarly with feathering. A specified level of pixel feathering does not match the end result (see screenshot). I've tested this on numerous trials from 1 to 10 pixel feathering and counted the number of pixels affected - there seems to be no correlation between the specified pixel feather and the result. So, for example, the 2 pixel feather, on the straight edge, affects 7 pixels, and the 4 pixel feather, affects 12 pixels.


I find these to be slight annoyances, especially on the feathering, but I'm more interested to know how and why this should be, and if anyone else has investigated it? I'm guessing it's something to do with the workings of Photoshop? It would be nice to find some sort of equation to do away with the frequent trial and error of brush strokes and feathering.


[ATTACH]76398[/ATTACH]


ps. I'm using CS5.


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