Tag
“sharpening”
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- Technical Deep Dives··8 min read
Why Sharpening a Cutout Draws a Halo Around Fur
Upscale a cutout of a long-haired pet and a bright rim appears along the fur. The model did not do it — an alpha-blind sharpening pass did, by averaging in the black that sits behind every transparent pixel. Here is the mechanism, the fix, and exactly what the numbers behind it were measured on.
Technical Deep Dives··9 min readWhich Blurs Can Be Recovered, and Which Are Simply Gone
Camera shake, focus miss, subject motion and noise all look like 'blurry' and only some of them are reversible. Here is what a deconvolution model can actually put back, the resolution trade the tool makes to run in a browser tab, and how to tell in advance whether a photo is worth the attempt.