Hi Axel, Responses inline...
> From: Axel Jacobs <[email protected]> > Date: February 27, 2012 11:42:09 PM PST > > ... >> I cannot use a strict cut-off for image values. Up to 0.2% of the pixels >> below the minimum are ignored and 0.05% of pixels above the maximum, >> likewise. This avoids issues with stuck pixels, which would otherwise make >> the -x option useless. This is also why it is better not to use -x for >> critical work, because you may lose the peak highlight in your image if it >> happens to be very small. > > This is probably what happened with my sequences. Since hdrgen copes > admirably with completely black frames (as far as the human eye can > tell), it's probably best to use them all, rather than make a > pre-selection. This is more true of the latest code. In some cases, the old version would allow noise from short exposures to leak into the final result. The new code has a couple of different strategies to mitigate this problem. >> Note also that hdrgen would never discard an input exposure off the end >> because it was "in range." Only the exposures shorter than first one below >> the safe maximum and the exposures longer than last one above the safe >> minimum that are considered superfluous. >> >> I have a Lubuntu installation running under VMWare with gcc version >> 4.6.1-9ubuntu3. I could use it to recompile hdrgen if you like, but I'm not >> sure what machines it would run on.... > > That would be absolutely super-fantastic. I understand from > http://www.hdrlabs.com/news/index.php?id=8369771879810293991 > that the ghost removal in Photosphere is now second to none, and that > it can even handle breaking waves and swaying palm trees on tropical > beaches. This is really exciting! I don't fully agree with the comment on Christian Bloch's site. I worked on the Photoshop CS5 ghost removal as well, and the algorithm is very similar, with the added ability to control which exposure serves as reference in CS5. It may have worked better on this one example, but I sometimes find myself using Photoshop when Photosphere doesn't do what I want it to. I've fooled around with compiling a bit now, and I don't know that I can get the TIFF library to build for me under Lubuntu. It will probably be easiest to compile a Linux version of hdrgen that only produces Radiance (.hdr) output. Would this be sufficient? > I volunteer to update the man page, if you like. I think I have one already, but any fixes you have would be welcome! Cheers, -Greg _______________________________________________ HDRI mailing list [email protected] http://www.radiance-online.org/mailman/listinfo/hdri
