Baxter Posted August 13, 2007 Share #1 Posted August 13, 2007 Advertisement (gone after registration) It is some while since anything was posted about Camera Calibration. I was wondering if anyone has been working away trying to improve the integrity and accuracy of this vital aspect of using the M8. Having downloaded and run both the Rags and Fors Photoshop scripts, the results are very different as can be seen in the spreadsheet attachment from the profiles generated from the same DNG image files following relevant instructions. Neither am I convinced that either is accurate. With Leica IR/UV cut filters in place, I shot the GM colour-checker chart in a several lighting scenarios. Initially I ran the Fors scripts and saved as development settings in Lightroom (my primary software for the M8) and as named presets in ACR. Thus I am able to select appropriate setting for each image as the baseline before choosing whether further tweaking is necessary. Rather than reinvent any wheels, I thought I'd canvas members. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/31019-calibration-any-new-developments/?do=findComment&comment=328933'>More sharing options...
Advertisement Posted August 13, 2007 Posted August 13, 2007 Hi Baxter, Take a look here Calibration - any new developments?. I'm sure you'll find what you were looking for!
gwelland Posted August 13, 2007 Share #2 Posted August 13, 2007 Interesting to see the differences. I've used the Fors calibration with my D2X's and M8's and it makes a significant improvement overall in colour rendition. Do you find any significant colour rendering differences between the two calibrators? Is one more 'neutral' or more pleasing, particularly in the greens, than the other? I'll shoot some more targets for comparison and try the Rags to see if it produces a nicer set of calibrations for me too. Beautiful classic LF landscapes on your site btw. Quote Link to post Share on other sites More sharing options...
Baxter Posted August 14, 2007 Author Share #3 Posted August 14, 2007 Yes the Fors do improve colour rendition, although I feel the greens are overcooked - even from a Fuji Velvia user! I started to modify them by reducing green saturation, but felt that some of the yellows weren't terribly pleasing. With this in mind, and lots of new miages to process, I ran the Rags profiles yesterday. First impressions only are that the Rags ones look more acceptable to my way of seeing, blues seem more natural. On some images such as an open beach vista, there is little practical difference. I'll run the Rags scripts for Overcast and indoor mixed lighting today and see what effect they have. The problem will be clogging up the Lightroom Develop presets window with all the possibilities, I am loathe to delete them at this stage until I have more confidence in their integrity. I am perplexed that so many members of this site will discuss apparent differences in lenses and relative merits relatively endlessly and yet heads seem to be in the sand on this issue. The effect of RAW processing and getting good or correct colour is arguably just as important in the final image - it affects every single image, not just the percentage where a particular lens was used. Furthermore there seems to be big gains to be had for very little expenditure, quite the contrary to lens issues! Thanks for having a look at my LF pictures Graham, the website needs an update - too much fiddling with the Leica is my primary excuse! Quote Link to post Share on other sites More sharing options...
lct Posted August 14, 2007 Share #4 Posted August 14, 2007 ...I am perplexed that so many members of this site will discuss apparent differences in lenses and relative merits relatively endlessly and yet heads seem to be in the sand on this issue... What do you attribute your overcooked greens to? Calibration or IR-cut filters? Quote Link to post Share on other sites More sharing options...
robsteve Posted August 14, 2007 Share #5 Posted August 14, 2007 Max: Are you using Lightroom on a Mac or a PC? I have noticed most of the calibrations I have seen are far from what I am using and really don't work with my images. I am on a PC. It is the greens settings that seem to off the most in these fors calibrations that have been posted here. My setting for the M8 are: red hue +8 red Sat +1 Blue Hue -8 Robert Quote Link to post Share on other sites More sharing options...
Baxter Posted August 14, 2007 Author Share #6 Posted August 14, 2007 Set-up is Gretag-McBeth eye-one colour managed Mac running Lightroom 1.1 and Pshop CS2. The greens get boosted significantly in the Fors profiles from the plain file when opened in Lightroom. Haven't looked at images without the Leica filters, but the greens are pretty subdued without any adjustment, in contrast, the reds look very bright in the unadjusted file. Both the Fors and Rags calibration systems seem to bring the others up to the higher level, rather than attenuate the reds. It is the level to which the greens are boosted in Fors adjustments which led me to question if others are having similar issues and therefore what solutions might have been reached. Either few, or people aren't sharing! Surely others are trying to establish colour managed settings in order to ease the process of getting images to proper standard for output? For monitors, scanners and printers it is an esential aspect of digital work-flow. My understanding was that camera calibration was necessary in the same way as it is for scanning E6 accepting that cannot do for C41 (ignoring Rollei scanfilm). Quote Link to post Share on other sites More sharing options...
woodyspedden Posted January 4, 2008 Share #7 Posted January 4, 2008 Advertisement (gone after registration) I am having a hard time getting Mr Fors ACR Calibrator to work as it is not compatible with ACR Raw 4.3.1. But I am using John's M8 UV/IR which is Red hue 6 and Red sat -15 and I think it is very good. Of course any of these are just starting points and you will have to adjust depending upon light conditions. YMMV Woody Spedden Quote Link to post Share on other sites More sharing options...
barjohn Posted January 5, 2008 Share #8 Posted January 5, 2008 Baxter, To get the Fors calibrator to work with ACR 4.3.1 you need to edit the script. If you like, I have uploaded the edited script for use. I would like to try the Rags script but I don't have it. If someone can point me to it I would appreciate it. I had to give it a file extension of .pdf, just change it to .jsx to make it work. Down load it first. AcrCalibrator.pdf Quote Link to post Share on other sites More sharing options...
woodyspedden Posted January 5, 2008 Share #9 Posted January 5, 2008 Baxter, To get the Fors calibrator to work with ACR 4.3.1 you need to edit the script. If you like, I have uploaded the edited script for use. I would like to try the Rags script but I don't have it. If someone can point me to it I would appreciate it. I had to give it a file extension of .pdf, just change it to .jsx to make it work. Down load it first. John I couldn't open the attached file. I believe it is corrupted. Could you re-attach? I really need to work with ACR 4.3.1 and need the script mods. Thanks much Woody Spedden Quote Link to post Share on other sites More sharing options...
barjohn Posted January 5, 2008 Share #10 Posted January 5, 2008 Woody, Download it first, then change the file extension to .jsx. I just tested this and it works fine. It wouldn't let me upload it as a .jsx file. Quote Link to post Share on other sites More sharing options...
robsteve Posted January 5, 2008 Share #11 Posted January 5, 2008 In regards to some of the settings posted where there are large adjustments made in the Calibration, have you noticed these adjustments will cause clippin earlier in the resulting conversion? In other words, when one channel is boosted a lot, are we affecting the dynamic range of the sensor and introducing more noise? Quote Link to post Share on other sites More sharing options...
woodyspedden Posted January 5, 2008 Share #12 Posted January 5, 2008 Woody, Download it first, then change the file extension to .jsx. I just tested this and it works fine. It wouldn't let me upload it as a .jsx file. John I did this as you suggest but when in Photoshop when I go to scripts, browse the ACR Calibrator.JSX is greyed out! It is probably me but that is the situation for me now. Any idea of what I am doing wrong? Woody Quote Link to post Share on other sites More sharing options...
Baxter Posted January 5, 2008 Author Share #13 Posted January 5, 2008 I haven't used this for a while, but this link comes from my bookmarks. I see that he has updated them in November. Rags Gardner's script Please let us know how you get on! Quote Link to post Share on other sites More sharing options...
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