Commons talk:Featured picture candidates/File:Lagangarbh cottage with Buachaille Etive Mòr.jpg

Only as question @Colin: Are the halos from HDR or sharpening? --Ralf Roleček 21:22, 9 November 2015 (UTC)

Ralf the 1px wide halo appeared to be the result of sharpening. I used the Lightroom preset "Sharpen - scenic" and applied also a sharpening mask to avoid the sky becoming noiser. So this is a fairly standard amount of sharpening. I guess the strong contrast between the dark mountain and the grey sky emphasised the sharpening halo. To eliminated it, I painted the sky with an adjustment brush of an equal amount of negative sharpening (using "auto mask" to get right up against the mountain but not overlap into the mountain) -- this resets the sharpening to 0 in that area. Another kind of halo I've seen on other pictures is a softer and wider kind caused by too much Clarity in Lightroom. But there's only a modest amount of clarity applied and when I tested removing it, it didn't seem to make any difference. The image isn't HDR, just stitched from several frames. I read that Clarity is local-contrast tone mapping from the relatively HDR of a raw file onto the LDR of a JPG, so the same kind of artefacts can result from over-use. -- Colin (talk) 22:27, 9 November 2015 (UTC)

I know a similar effect from Photoshop too ... --Alchemist-hp (talk) 22:55, 9 November 2015 (UTC)