Bob Jarman Offline Upload & Sell: Off
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RustyBug wrote:
Don't click the mouse ... problem solved.
A couple things come to mind.
1) Looking at the different zoom levels, it renders different amounts of moire'. I have noticed this before on many different things, but as long as I'm good at 100%, I don't think much about it. I've resized images up / down and seen the moire' come & go accordingly.
2) Are you letting LR do sharpening on your view/preview? Again, I think this is being artificially display induced, as the 100% version only has one section of fence (the angled one) that hints at moire'.
Generally speaking, moire' is a frequency issue. By scaling things down, you are changing the frequency. If you want to scale down, you might need to apply some form of blur / NR / etc. prior to scaling down. Conversely, you might try to uprezz the image and see how the different algorithm (bicubic, linear, etc.) might play to adjust the frequency.
However, if this is just your "viewing" and not your final output, likely nothing to be concerned with. I'd run a test print from a section @ 100%, and see if it shows up in print. Depending on your workflow, you may want to modify your sharpening algorithm, as a "softer" transition may be less susceptible to the frequency relationship. Also, if LR is applying output sharpening, that might be something to consider adjusting in your workflow as well.
Is the 100% view sooc / raw, or is it somewhere along the path of PP (i.e. did you have any sharpening applied by LR or on the way in? Personally, I have all my input set to "0" in ACR or DPP when bringing things into PS.
Hard to say from here, but I suspect that the "near" (i.e. not really) moire frequency territory of the fence is being induced into moire' territory by either scaling or sharpening or a combination of both.
Here's your large view reduced to 50%. I blurred it some before downrezzing it (reduced contrast a bit, and brightened it some, too). THEN applied some sharpening (which drives contrast darker / lighter to recover the blur / contrast reduction). Depending on how much sharpening I applied, I could certainly induce MORE MOIRE' (exaggerated examples for ease of view) ... so, here again, I think your workflow / usm might warrant some modification for the structure that the fence represents. Might even consider some masked / selective sharpening for the differently structured areas in the scene.
Best to work from RAW, but hopefully you get the gist that our processing can induce moire' that didn't originate from the actual capture. Thus we may need to modify our usual processes to safeguard against inducing the moire'.
HTH ... but, I really think this one is more of a viewing issue on your display in concert with USM or LR sharpening in your previews (i.e. you don't have a real issue, just the illusion of one).
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AuntiPode wrote:
When the grid of a fence makes your eyes take offense, that's a moiré.
<ducking>
Thanks Kent,
A friend in Oz, across the water from Karen, also told me the anomaly is display/size related, no problem at 100% so not really moire. I'll explore more, maybe a bit OCD? , later.
Karen, you owe me for setting that one up for you - nicely played
Bob
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