chrismuc Posted February 7, 2016 Share #1 Posted February 7, 2016 Advertisement (gone after registration) I bought a 2nd hand M9, works nicely. I thought only the M8 had the problem to be sensitive to IR due to the lack of an IR filter on the sensor. But actually my M9 records black nylon fabrics with rather red color cast. Is that normal? Anything can do in post? I have the original sensor. Would the replacement glass + sensor have a more efficient IR filter? 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/256598-m9-ir-sensibilityreddish-color-cast/?do=findComment&comment=2984946'>More sharing options...
Advertisement Posted February 7, 2016 Posted February 7, 2016 Hi chrismuc, Take a look here M9 IR sensibility/reddish color cast. I'm sure you'll find what you were looking for!
tobey bilek Posted February 7, 2016 Share #2 Posted February 7, 2016 When the problem first appeared on the M8, I took the photo from the internet into photoshop. Then made a color selection of the offending place and did a desaturation. I leave the filters on all time for M8 and M9 photos. If you can not get a decent selection, I would make a dup layer , desaturate the whole thing, then make a mask and hand paint the coat white. There will be trouble separating the darker areas of the coat from her dark hair. You might have to hand modify the mask making her hair black . PS experts can suggest a better way to mask. Quote Link to post Share on other sites More sharing options...
tobey bilek Posted February 7, 2016 Share #3 Posted February 7, 2016 color select- hand paint mask to deselect hair- desaturate 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/256598-m9-ir-sensibilityreddish-color-cast/?do=findComment&comment=2985050'>More sharing options...
erl Posted February 7, 2016 Share #4 Posted February 7, 2016 Simple and effective solution is to use IR cut filter on all lenses. The magenta problem is especially bad under tungsten lighting. I used to do a lot stage and theatrical work. IR cut filter is essential then. In daylight, greens are marginally improved using the IR filters. Beware of reflections from the filter (any filter) at night when light sources are included in the image. 1 Quote Link to post Share on other sites More sharing options...
Rus Posted February 8, 2016 Share #5 Posted February 8, 2016 I find the same slight IR contamination in M9 images taken in very bright sunlight. Quote Link to post Share on other sites More sharing options...
farnz Posted February 8, 2016 Share #6 Posted February 8, 2016 (edited) If you're going to desaturate in post processing to restore the magentas to blacks then I recommend using LAB colour space instead of RGB and desaturating in the 'A' channel so that the luminosity/luminance will be unaffected. No selection or mask needed, just Desaturation brush at 100% in PS. Pete. 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! Edited February 8, 2016 by farnz 1 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/256598-m9-ir-sensibilityreddish-color-cast/?do=findComment&comment=2985731'>More sharing options...
chrismuc Posted February 9, 2016 Author Share #7 Posted February 9, 2016 Advertisement (gone after registration) Thx Pete & Tobey good ideas (at least for post) LAB mode is very useful for such purpose I saw the effect mostly outdoors (sunny or cloudy) maybe still better to use IR filters (but I don't like filters, normally never use them) Quote Link to post Share on other sites More sharing options...
tobey bilek Posted February 9, 2016 Share #8 Posted February 9, 2016 I knew some expert would help. Notice the green cast in the coat in what I did did not happen with LAB. I did not rebalance the color. Quote Link to post Share on other sites More sharing options...
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