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response:9744
response:9744


Author Comment Last activity Moderation
cfastie "Hi CHUMBA, I have never seen the inside of a Samsung camera, so I can't be of any help. There is probably a filter somewhere. Maybe it is glued to..." | Read more » almost 7 years ago
CHUMBA "Hi @cfastie, I wonder if you know How take out the IR filter from a Samsung DV150-f, I have one, I broke it, and I did not find the IR filter anywa..." | Read more » almost 7 years ago
Tbtouaki "Hi I had wrong white balance for my camera. Thanks everyone for the help. Sorry for the trouble If anyone has any idea on how to save pictures take..." | Read more » about 7 years ago
Tbtouaki "Hi I have tried several white balance options before, base on what I've read. On this pics the settings were exactly the same as the maxmax camera...." | Read more » over 7 years ago
cfastie "Hi Rita, Your photo above (NIR1_Red3_b.jpg) will not produce very good NDVI. Most of the pixels of plants have the same value in each of the three ..." | Read more » over 7 years ago
Tbtouaki "Hi I currently have a modified canon (IR block removed) with a wratten 25A Red filter. My pictures are really nice looking but I have big problems ..." | Read more » over 7 years ago
mathew "thank you for these conversion details and trying to get to the bottom of this problem. " | Read more » over 7 years ago
patcoyle "Chris, excellent well documented tips. I appreciate your continuing effort to advance the quality of results from these tools. " | Read more » over 7 years ago
Tbtouaki "Hi I have several filters to put in front of the lenses and was considering which to put inside, to replace the IR filter. Thank you so much for ..." | Read more » over 8 years ago
cfastie "Tbtouaki, It sounds like you have a full spectrum camera, one that has the IR blocking filter removed and nothing replacing it. By placing a filte..." | Read more » over 8 years ago
Tbtouaki "How do you swap channels in an unmodified camera from RGB to NIR? What kind of camera are you using? I am really interested in this, I am photograp..." | Read more » over 8 years ago
nedhorning "Hi Roolark - I don't have a spectral sensitivity curve for the A2200. I've been using LEDs to get a rough idea of spectral sensitivity but that's a..." | Read more » over 8 years ago
Roolark "@Ned, do you already have a spectral sensitivity curve for the canon A2200, with its ir block filter removed (similar to the Nikon curve above)? If..." | Read more » over 8 years ago
mathew "I think doing calculations based on red and green might be two ways to get to the same result that Chris was seeking in his Oaktober note-- the cha..." | Read more » over 8 years ago
warren "It's weird because we think of green being reflective, but compared to IR, it's very absorbent. " | Read more » over 8 years ago
cfastie "Mathew, That does seem to be a consistent pattern. I think you are right that a green filter might offer the purest visible light channel in a sing..." | Read more » almost 9 years ago
mathew "looking at the sensor sensitivity graph for the Nikon D200, its interesting that green is the least sensitive channel in the infrared band, implyin..." | Read more » almost 9 years ago
cfastie "Hi Pat, The Wratten 25A is an old standard photographic filter that is still widely available in glass and gel. I think Ned bought a genuine Kodak ..." | Read more » almost 9 years ago
patcoyle "Thanks Chris and Ned, this is an encouraging line of inquiry. Remind me on the source for the Wratten 25 filter material, or is it in the prior not..." | Read more » almost 9 years ago