On Wed, Feb 29, 2012 at 11:10 PM, Larry Colen <[email protected]> wrote:
>> I thought that was (part of) what Highlight Recovery in Lightroom/ACR did. > > Not so far as I know. I thought that all it did was tweak the conversion > from raw to JPEG to closer to the way overexposure on film works, beyond a > certain point, it takes a lot more input to make the same amount of output. > I've never seen highlight recovery bring anything back that you couldn't > get back with the exposure slider, it just doesn't darken the rest of the > data at the same time. It sounds like you're just describing a tone curve rolloff; that's not all Highlight Recovery is. When one or two channels are clipped, Highlight Recovery does use the unclipped channels to provide luminance information. The reason you don't see any difference from Exposure is that Exposure uses the same approach as Highlight Recovery when channels are clipped. See, for example, the introductory paragraphs of this paper (which is a couple of versions out of date): http://www.adobe.com/digitalimag/pdfs/phscs2ip_hilight.pdf Note changes in Highlight Recovery and the highlight clipping warnings in LR4's Process Version 2012: http://forums.adobe.com/message/4177664 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
