sean_reid Posted June 1, 2007 Share #21 Posted June 1, 2007 Advertisement (gone after registration) Bill, In fact, if you want, you could generate one for various forms of lighting. Sandy I was thinking the same thing and actually mentioned that in the article. For critical color work, it could be quite useful to have different profiles for different lighting conditions - although it certainly shouldn't be necessary for a lot of work. Cheers, Sean Link to post Share on other sites More sharing options...
Advertisement Posted June 1, 2007 Posted June 1, 2007 Hi sean_reid, Take a look here ReidReviews is testing a vignetting correction program. I'm sure you'll find what you were looking for!
sean_reid Posted June 1, 2007 Share #22 Posted June 1, 2007 CornerFix is GPL licensed, so the full source code will be available to anyone that wants to modify it to a Mac version. Of the 120+ plus files that make up the full source code base, only about 6 are Windows specific, so in principle, it shouldn't be a big problem. Sandy Cool! That's great news. See, I told you people were gonna' love this. <G> Cheers, Sean Link to post Share on other sites More sharing options...
sean_reid Posted June 1, 2007 Share #23 Posted June 1, 2007 CornerFix will be, in my mind, essential for the CV 12 (if one is using IR-cut filters) and should also be very useful for the Zeiss 15. The Zeiss has 72 mm filter threads and Leica doesn't make a UV/IR filter that big. But one can get a 486 in that size so the hot ticket for color work with the Zeiss 15 will likely be lens + 72 mm 486 filter + Corner Fix. The factory (firmware) cyan drift corrections for the WATE still needs to be dialed in a little better so, for the time being, CornerFix will probably provide better corrections for WATE files than the M8 itself will. Again, though, I expect that future firmware will better correct cyan drift for the WATE (and I'm actively working towards that result). So,all of the ultra-wide RF lenses I just tested can benefit from CornerFix. For the longer lenses, I still prefer the convenience of the M8's "in camera" corrections (with coded lenses) but CornerFix does also provide an alternate option for people with uncoded lenses. As many will have gathered by now, I really enjoy seeing independent solutions being made by creative individuals such as John Milich and Sandy. I support those kinds of efforts and like to write about them. Leica is doing their best, in most respects, but these additional options from Jaime, Edmund, Sandy, etc. are, in my mind, a good thing for photographers. Cheers, Sean Link to post Share on other sites More sharing options...
scott kirkpatrick Posted June 1, 2007 Share #24 Posted June 1, 2007 Hi, Sean. This sounds great. I gather that CornerFix performs a full-frame correction for both luminance vignetting and red vignetting -- opens the DNG, rescales the RG or B values by reference to the profile, and puts it all back into DNG form? Does all the EXIF (including the proprietary MakerNotes) survive the transformation? How will you handle color temperature settings? The cyan drift is much more dramatic at 3000 K than it is at 5500 K or 7500 K. Will you shoot separate profiles for each of several kinds of lighting or have a blending parameter which will adjust the strength of the correction, using a standard profile? scott Link to post Share on other sites More sharing options...
sean_reid Posted June 1, 2007 Share #25 Posted June 1, 2007 Hi, Sean. This sounds great. I gather that CornerFix performs a full-frame correction for both luminance vignetting and red vignetting -- opens the DNG, rescales the RG or B values by reference to the profile, and puts it all back into DNG form? Does all the EXIF (including the proprietary MakerNotes) survive the transformation? How will you handle color temperature settings? The cyan drift is much more dramatic at 3000 K than it is at 5500 K or 7500 K. Will you shoot separate profiles for each of several kinds of lighting or have a blending parameter which will adjust the strength of the correction, using a standard profile? scott Hi Scott, Sandy is the one to answer questions about the program itself. I plan to make profiles based on daylight and studio tungsten but the program is designed so that it can create its own profiles (based on source files) so people can certainly make their own based on whatever conditions they're working in, etc. Again, I just provided some source files and feedback, this is really Sandy's baby. At first blush, the corrected DNG files seem to retain the EXIF information that is in the original EXIF files. Cheers, Sean Link to post Share on other sites More sharing options...
billh Posted June 2, 2007 Share #26 Posted June 2, 2007 I was thinking the same thing and actually mentioned that in the article. For critical color work, it could be quite useful to have different profiles for different lighting conditions - although it certainly shouldn't be necessary for a lot of work. Cheers, Sean Could Leica buy this program and incorporate profiles like you mention into their firmware? Link to post Share on other sites More sharing options...
billh Posted June 2, 2007 Share #27 Posted June 2, 2007 Advertisement (gone after registration) posted the same time as Sandy. PC only, darn. We need to get our Mac hackers out there and work on this:D Until that happens, why don't we just send our files to the PC guys to convert for us? Link to post Share on other sites More sharing options...
sean_reid Posted June 2, 2007 Share #28 Posted June 2, 2007 Could Leica buy this program and incorporate profiles like you mention into their firmware? Hi Bill, They essentially do incorporate correction profiles into their firmware - for the coded Leica lenses. Sandy has basically given an external and flexible tool for doing what the M8 does when it detects specific lenses. Cheers, Sean Link to post Share on other sites More sharing options...
sean_reid Posted June 2, 2007 Share #29 Posted June 2, 2007 Until that happens, why don't we just send our files to the PC guys to convert for us? For some photographers, for now, it might be worthwhile to drag out an old PC from the mothballs and use it just to batch convert these files before doing the serious work on the Mac. Sandy tells me that batch conversion will be coming down the pike. Cheers, Sean Link to post Share on other sites More sharing options...
MP3 Posted June 2, 2007 Share #30 Posted June 2, 2007 Sandy and Sean I believe Leica should at least show her gratitude to you guys in rounding up the little beautiful M8 world here. Any way to let Leica or C1 to incorporate the CF features in their firmware or software system and reward you guys? Cheers Matthew Link to post Share on other sites More sharing options...
sean_reid Posted June 2, 2007 Share #31 Posted June 2, 2007 Hi Matthew, Thanks very much but it's Sandy who deserves any reward. I wouldn't rule out seeing a feature like this in C1 4.0, though. Cheers, Sean Link to post Share on other sites More sharing options...
sandymc Posted June 2, 2007 Share #32 Posted June 2, 2007 Hi, Sean. This sounds great. I gather that CornerFix performs a full-frame correction for both luminance vignetting and red vignetting -- opens the DNG, rescales the RG or B values by reference to the profile, and puts it all back into DNG form? Does all the EXIF (including the proprietary MakerNotes) survive the transformation? How will you handle color temperature settings? The cyan drift is much more dramatic at 3000 K than it is at 5500 K or 7500 K. Will you shoot separate profiles for each of several kinds of lighting or have a blending parameter which will adjust the strength of the correction, using a standard profile? scott Scott, As Sean states above, all the EXIF data is kept, including the proprietary stuff. As regards color temperature, CornerFix keeps the color temperature at the center of the image. So gray in the center stays gray in the center. Note however that doesn't mean that average color temperature of the image stays the same - effectively, the corners get "warmer" Sandy Link to post Share on other sites More sharing options...
sandymc Posted June 2, 2007 Share #33 Posted June 2, 2007 Sandy and Sean I believe Leica should at least show her gratitude to you guys in rounding up the little beautiful M8 world here. Any way to let Leica or C1 to incorporate the CF features in their firmware or software system and reward you guys? Cheers Matthew Matthew, CornerFix is GPL licensed. What that means in this situation is that the code is freely available, but cannot be sold for gain, and cannot be incorporated into anything that is sold for gain. At least not without talking to me(!). It is entirely acceptable to use the software for any purpose, including correcting images that are to be sold commercially. Its just the actual code, or anything derived from it, that can't be sold. Sandy Link to post Share on other sites More sharing options...
carstenw Posted June 2, 2007 Share #34 Posted June 2, 2007 I didn't see this mentioned, but does CornerFix have separate settings for the four corners? Link to post Share on other sites More sharing options...
sandymc Posted June 2, 2007 Share #35 Posted June 2, 2007 I didn't see this mentioned, but does CornerFix have separate settings for the four corners? Carsten, No, CornerFix is designed to provide only symmetrical correction, by automatically analyzing a reference field. Doing each corner separately is possible in theory, but would require really, really flat illumination over the reference field. The big advantage that symmetrical correction has is that it's quite tolerant of uneven illumination on the reference flat field, something that I felt was really important given that most people don't have the kind of equipment required to get 100% flat illumination. One option, perhaps for a future release, would be to allow manual tweaking of each corner. Sandy Link to post Share on other sites More sharing options...
carstenw Posted June 2, 2007 Share #36 Posted June 2, 2007 Perhaps a shift of the centre might be a desirable adjustment parameter then. I have seen photos posted on this board made with modern Leica lenses (and those of other manufacturers) which displayed a distinct non-uniformity, as if the whole optical assembly was off-centre. Congratulations on the program, by the way. It seems very useful. More technical questions: Do you load the DNGs yourself? What image format does your program work in, and how do you export? Link to post Share on other sites More sharing options...
sandymc Posted June 2, 2007 Share #37 Posted June 2, 2007 Perhaps a shift of the centre might be a desirable adjustment parameter then. I have seen photos posted on this board made with modern Leica lenses (and those of other manufacturers) which displayed a distinct non-uniformity, as if the whole optical assembly was off-centre. Congratulations on the program, by the way. It seems very useful. More technical questions: Do you load the DNGs yourself? What image format does your program work in, and how do you export? Carsten, The program uses Adobe's DNG Software Development Kit to do most of the file reads/writes and the decoding of the various DNG fields. The actual devignetting is done on the raw image (what Adobe would call the stage 1 image). Sandy Link to post Share on other sites More sharing options...
cjago Posted June 2, 2007 Share #38 Posted June 2, 2007 All, (a) this is Windows only, and requires that you have both .NET 2 and the VC 2005 Redistributables installed on your machine (instructions on how to do that are with the software). No Mac version! Sandy Sandy, Any idea whether your program will run in a Windows environment on an Intel Mac (i.e. Parallels or Boot Camp)? Your references to .NET 2 and VC 2005 are way over my head :-) As others have said, many, many thanks for your efforts. Colin Link to post Share on other sites More sharing options...
gwelland Posted June 2, 2007 Share #39 Posted June 2, 2007 Windows on Mac with Parallels/Boot Camp (Intel Mac) or Virtual PC on a G4 should all support the application. It'll just be a normal windows app built on .NET by the sounds of it. If you need someone to look at the Mac port then I could possibly be interested to help. I have a full dev environment and could look at a port if you need it. Link to post Share on other sites More sharing options...
Guest tummydoc Posted June 2, 2007 Share #40 Posted June 2, 2007 Sean & Sandy, how is this programme different or better than PanoTools Radial Luminance? I've been using that ever since I've had my M8 and find it works admirably. My big problem is where there's a mix of lenses used on my card, of course there's no EXIF data to show me how to group them for batch correction. I'm very excited about these programmes because I'm loathe to butcher my collectible lenses (such as the 35 Summilux-ASPHERICAL) with coding. Link to post Share on other sites More sharing options...
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