gdanmitchell Offline Upload & Sell: Off
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I'm wondering if something changed in the more recent versions of ACR and Lightroom. "Back in the day" ACR (and, I assume, Lightroom) automatically mapped out the hot or deal pixels. Yet, recently I have also seen them showing up in my raw images again. (I looked through ACR menus to try to find an option to turn pixel mapping on/off, but could not find one.)
By the way, this issue is not entirely limited to long exposures, though I certainly do see them in some recent night photography.
There is supposedly a method to get your Canon camera to map them out: Turn the camera on. Turn on manual sensor cleaning, but do not remove the lens. Leave it in this mode for 30 seconds. Then shut the camera off. I have no idea if this actually works, but I see it described in various places on the web.
In the meantime, you can easily delete them by using the clone tool. I use the ACR clone tool to eliminate mine.
Dan
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