03-27-2012, 12:16 PM
Yes, I did, of course, play around with different setups including one with a max. LW/PH at 3800.
As you surely know the sharpening effect is depending on the contrast of an "edge" on pixel level. Thus sharpening will always emphasize edges that are already sharp anyway. This is espeically "dangerous" regarding the lack of AA filtering on the horizontal axis. A sharpening of a "clean" edge on this axis results in a fairly extreme boost. Imatest does detect this and provides a figure defining the "over-/under-sharpening" of an edge. This figure is a key calibration point.
A higher sharpening (than the one currently used) does there always emphasize the center - less so the less-sharp corners. The "spread" between center and borders/corners would have been higher (LW/PH-wise).
However, we would have also used a different scale, of course. The "current" borders/corners are very slightly "better" (visually on the chart) compared to the version that I would have used with a more aggressive sharpening. However, the visual difference isn't substantial (and in fact it's less than I anticipated).
As you surely know the sharpening effect is depending on the contrast of an "edge" on pixel level. Thus sharpening will always emphasize edges that are already sharp anyway. This is espeically "dangerous" regarding the lack of AA filtering on the horizontal axis. A sharpening of a "clean" edge on this axis results in a fairly extreme boost. Imatest does detect this and provides a figure defining the "over-/under-sharpening" of an edge. This figure is a key calibration point.
A higher sharpening (than the one currently used) does there always emphasize the center - less so the less-sharp corners. The "spread" between center and borders/corners would have been higher (LW/PH-wise).
However, we would have also used a different scale, of course. The "current" borders/corners are very slightly "better" (visually on the chart) compared to the version that I would have used with a more aggressive sharpening. However, the visual difference isn't substantial (and in fact it's less than I anticipated).