troyfreund Posted August 13, 2006 Share #1 Posted August 13, 2006 Advertisement (gone after registration) Hey Folks, Hoping you can help me out here. I usually only use my R8/DMR at low ISO settings, but have shot at a few weddings lately with it. I see this strange striations in the dark areas, particularly if the shotis on the under-exposed side. What is this strange action going on and will it adversely affect my prints--will it show up? What is it? 2nd problem--less frequent. I"ve only seen it maybe 2-3 times, but it's still an awful little matter. In the deep shadows, I don't get flat black shadow, but get these funky, weird whiteouts happening. Anyone else experience this? What's the matter? Thanks so much for any advice. The first two crops @ 100% show the patterned noise I"m speaking of. The third crop shows both issues--patterned noise and messed-up shadow areas. Oh, one more thing--some time back, a forum member mentioned a good solution for cleaning the DMR's sensor. Could I please be reminded of what that solution was? Troy Freund Troy Freund Photography Link to post Share on other sites More sharing options...
Advertisement Posted August 13, 2006 Posted August 13, 2006 Hi troyfreund, Take a look here DMR issues--anybody else?. I'm sure you'll find what you were looking for!
gravastar Posted August 13, 2006 Share #2 Posted August 13, 2006 I don't own a DMR but I'll have a guess at what the problems may be. The striated pattern could be due to radio interference from a cell phone or a nearby transmitter. The pattern isn't always in the same direction which is typical. Was the photo taken near the top of a building where there may be mobile phone transmitters? White areas in the shadows are a mystery. They look very similar to the effect you get if an editing program has "show clipped shadows" enabled, the absolute black or near black levels are highlighted. Similar if the program is set to show out of gamut colors. If you use a file viewer rather than an editor are the white areas still visible? Bob. Link to post Share on other sites More sharing options...
pascal_meheut Posted August 13, 2006 Share #3 Posted August 13, 2006 I had such problems when shooting Raw and using Flexcolor. Could you give us more infos about your parameters ? Link to post Share on other sites More sharing options...
troyfreund Posted August 13, 2006 Author Share #4 Posted August 13, 2006 OK, shooting in Raw, usually low ISOs. Have only noticed the weird striation in higher ISO--situations that have lots of shadows. Process the files through Flexcolor. I can see the striations in whichever application I use. I've not worried about it in the past, but recently shot this wedding for a friend's studio and he noticed it, worried about it, asked me about it. I had no good answer for him. Troy Link to post Share on other sites More sharing options...
pascal_meheut Posted August 13, 2006 Share #5 Posted August 13, 2006 Yes, this is a Flexcolor bug usually visible at 800 ISO. I reported it to Leica months ago and I remember it was fixed in some version of Flexcolor. But I'm not sure, I'm not using it anymore: I've switched to RawShooter and the to Capture One. Link to post Share on other sites More sharing options...
mgcd Posted August 13, 2006 Share #6 Posted August 13, 2006 I don't own a DMR but I'll have a guess at what the problems may be. The striated pattern could be due to radio interference from a cell phone or a nearby transmitter. The pattern isn't always in the same direction which is typical. Was the photo taken near the top of a building where there may be mobile phone transmitters? White areas in the shadows are a mystery. They look very similar to the effect you get if an editing program has "show clipped shadows" enabled, the absolute black or near black levels are highlighted. Similar if the program is set to show out of gamut colors. If you use a file viewer rather than an editor are the white areas still visible? Bob. Troy - The white area in shadows is a Flexcolor issue. I stopped using Flexcolor altogether as there were too many strange artifacts from processing, including the ones your images show. I stick to C1, getting excellent results. I would have to dig out my 800 ISO Flexcolor processed files with respect to the striation pattern. I certainly don't get this with C1. My first impression, like Bob, was that this was due to radio interference from a cell phone or other type of transmitter. Cheers, Link to post Share on other sites More sharing options...
bono0272 Posted August 14, 2006 Share #7 Posted August 14, 2006 Advertisement (gone after registration) Troy, Start trying Capture One. It will give you the best results in noise suppression and RAW conversion/adjustment. From the beginning of using my DMR with R8, I used Photoshop CS2 and Flexicolor but most of the forum members recommended me to switch to Capture One. And now I use C1 always, PS only for re-touching. Link to post Share on other sites More sharing options...
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