I seem to be getting sharpening artifacts with ACR 6.7 RC1 at relatively low levels of sharpening with Canon 5DM3 files using the "Details" tab. For instance even at ISO 200, I see these at levels like 40 -6-25-0. If I up the masking it does get a little better, but I've never seen this before while using a 40D. I sharpen at 100% view, but even at 50% this is noticeable. I'm using CS5 on a Dell Studio desktop running Windows 7 Home Premium. This is consistent across dozens of images, all of which are properly exposed. (No exposure/brightening/contrast or clarity, etc. applied)
Anyone else seeing this?
Hard to comment without an image, easy enough to post a 100% crop so we can see your artifacts.
I'm running 6.7, have not seen any sharpening problems on GH2 or S100 raw files.
The so-called "screen door effect" was caused by noise becoming distorted when applying a warp (e.g., lens profile correction). In that earlier example, a very high sharpening setting with no masking and no noise reduction was applied to a moderate ISO image.
I suggest applying Luminance noise reduction and using more Masking when applying sharpening. This avoids the pattern entirely.
Screen door effect...that kind of describes it. The only reason I flagged this was because I did not experience this while using a 40D. I have been employing the lens correction tab, so I'll take a look at this and see if it resolves the issue.
Thanks all for the input.