Re: Sony A77 and A65 and Nex-7 Announcements Today
Thank you for the (partially accurate) description of color aliasing. I\'m an optical engineer for FC in CCD design. You can get color aliasing just like that in the window from very-high frequency detail in the image. An object resolving at one pixel width and many tall (basically what the panes are) hitting an RGBG array does indeed produce color aliasing, which is what I\'m clearly seeing in both the fullsize and crops. Nyquist isn\'t really relevant when we\'re downsizing for web since we try to preserve that (false) detail as it averages pixels, as we see on the tree tops in the full size. If you take a crop of the trees sticking out over the building to the immediate left of the flagpole you\'ll see exactly what I\'m talking about. Here\'s one of my favorite examples to bring up when people try to claim you can\'t see color aliasing in resizes --
Anyhoo, I would be very curious to hear the rest of your explanations on optical theory. In another thread. Or maybe even a PM convo. If you ever want to send me those raws to look at that\'d be awesome as well. I\'d love a raw of this specific image since it\'s my typical case shooting for print scenario, and PP time is very important to me.
Aug 27, 2011 at 09:41 PM
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