Author Comment Last activity Moderation
jhondue123456 " " | Read more » about 2 months ago
warren "Hi, can you share the images you do get, before and after your calibration? " | Read more » over 4 years ago
warren "@warren awards a barnstar to Claytonb for their awesome contribution! " | Read more » almost 6 years ago
Claytonb "@Thorsten I have not tried using a chart like the color checker though I have used materials(plastic, felt, paper) in the shade of red on the chart..." | Read more » over 7 years ago
Thorsten "@Claytonb great work as usual! Two questions: Have you tried some reddish colors of calibration targets such as the ColorChecker? http://xriteph..." | Read more » over 7 years ago
cfastie "This is a great discovery. It will be good to learn how this color works with a red filter like Wratten 25. I will keep my eye out for Boom Chicka ..." | Read more » almost 8 years ago
Rural "Magic Lantern seems to run on the EOS M and has an intervalometer. I can't recommend Magic Lantern enough. I've got an EOS 600D/T3i that I much pre..." | Read more » about 8 years ago
cfastie "I don't know the specs of the blue paper I use for custom white balance. The idea is to flood the blue channel with light (when using a blue filter..." | Read more » over 8 years ago
carolccarvalho "@cfastie, I'm trying to do the white balancing manually using a Raspberry Pi and I need to know the number of this "pure blue" that you are using. ..." | Read more » over 8 years ago
funkycbj "I just used a StellarNet spectrometer to find the transmittance of hot filters from the Canon A2200 & A2500. Both hot filters rapidly fall off ..." | Read more » about 9 years ago
cfastie "Orangey yellow is good for blue filtered Infragrams. Turquoise blue is good for red filtered infragrams. Gray is bad. Below is a good red filtered ..." | Read more » over 9 years ago
liz "hey @cfastie and @warren , is it true that orangey looking photos indicate a well white balanced blue filter infragram, while blue/greyish photos i..." | Read more » over 9 years ago
nedhorning "I usually use a gray target to white balance my NIR camera but I know some people use green vegetation like grass for the white balance. You can ex..." | Read more » almost 10 years ago
gpenzo "ttaylor you make some good points there. My cameras are not on a gimbal but directly connected to the drone (pure for kiss). Because of some gust t..." | Read more » almost 10 years ago
ttaylor "Interesting work indeed. I have a few partly formed thoughts: 1) since there is a thunderstorm, the illumination conditions are highly variable an..." | Read more » almost 10 years ago
gpenzo "Good point Ned. I'm going to lock everything in those cam. Event the photos are not good I love the sharpness. Ned should I use white background fo..." | Read more » almost 10 years ago
warren "Ned, those are some great points -- would you mind if I used them as the basis of a new page at: ? " | Read more » almost 10 years ago
nedhorning "The NIR and visible images look a little different and that could be caused by a few factors. If any of the camera settings change between images i..." | Read more » almost 10 years ago
ttaylor "The alignment of the blue and red spectral response below 850nm that you are seeing is consistent with the spectral response curves that have been ..." | Read more » about 10 years ago
gpenzo "In my case I also want to capture visible images, will help the farmer to identify the problem. Can use my drone for mapping and 3d vegation maps w..." | Read more » over 10 years ago
cfastie "It's good to know about the NDRE. Instead of computing the difference between reflected NIR and reflected red light, I think NDRE replaces reflecte..." | Read more » over 10 years ago
funkycbj "Just so you know, 720nm is in the "red edge" region so you're not computing NDVI. You are computing the Normalized Difference Red Edge Index (NDRE). " | Read more » over 10 years ago
cfastie "Thanks Grayson, I was referring to stretching the histograms in the Fiji plugin. I forget what the default is, but it can make a big difference. ..." | Read more » over 10 years ago
gpenzo "Hello Chris. Seems I need to be more precise on my notes, answer to your question. NIR camera has the block filter removed. 720 and 850 nm filter ..." | Read more » over 10 years ago