frosted-globe
frosted-globe


Author Comment Last activity Moderation
cfastie "Setting a custom white balance on the Mobius camera can be done numerically. Determining which numbers to use requires trial and error and subjecti..." | Read more » about 7 years ago
suman "Dear Cfastie, Very informative. Thanks for posting. I was interested to know, which method is more preferred and accurate, whi..." | Read more » about 7 years ago
WhiteRabbit "Interesting results! " | Read more » almost 10 years ago
cfastie "You're right, that would be a revealing test. In the example you referred to (below), the red channel should be three times more sensitive than th..." | Read more » about 10 years ago
ttaylor "you know, if the little color filters in Mobius cmos sensor Bayer array have the same spectral response as some of the CCD sensors I've seen around..." | Read more » about 10 years ago
ttaylor "Wow, that was quick. Too bad about the Mobius not doing raw. I feel like a I have decent handle on the Canons, but the Mobius is so light and po..." | Read more » about 10 years ago
cfastie "Tom, Maybe it would also be useful to you to have DNG images (via CHDK) from my full spectrum Canon A810? " | Read more » about 10 years ago
cfastie "Hi Tom, I didn't capture RAW with the S95, and the Mobius does not do RAW (although the firmware is open source, so it's possible). I could capture..." | Read more » about 10 years ago
ttaylor "Chris, do you have raw versions of these images I could look at? " | Read more » about 10 years ago
mathew "I'm matching your process from here- got to go grab the rosco filter packs from storage, but I just printed up that beautiful mount. " | Read more » about 10 years ago
mathew "I'm surprised at the IR passing of the Powershot. nice research. really should buy some of those NIR LEDs myself. " | Read more » about 10 years ago
nedhorning "My guess is that you would get the same effect that you get with a blue card if you used a gray card and then multiply the blue channel by a factor..." | Read more » over 10 years ago
warren "Definitely the IR and vis are mixing unmeasurably, but I'm wondering if the blue card contributes to the sum amount of light being reflected in the..." | Read more » over 10 years ago
cfastie "Jeff, Our goal is to have 1) a red channel which records how much NIR is reflecting from plants, and 2) a blue channel which records how much blue ..." | Read more » over 10 years ago
cfastie "Ned, The G11 photos in the panel above were recorded in camera raw. According to my naïve model of what camera raw does, it should be possible to t..." | Read more » over 10 years ago
warren "I love the theory that the blue card is flooding the blue channel to minimize or outweigh or "wash out" the infrared from that channel. I think tha..." | Read more » over 10 years ago
nedhorning "This white balance stuff got me thinking. I don't think the white balance actually changes the amount of light recorded by the sensor but instead m..." | Read more » over 10 years ago
warren " " | Read more » over 10 years ago
cfastie "The relative amounts of NIR vs visible light in each channel is definitely a big and important unknown. The camera can't do anything to change that..." | Read more » over 10 years ago
warren "I guess the WB introduces a big unknown about the relative amounts of NIR vs visible light. One way the NIR and VIS might mix in blue is that perha..." | Read more » over 10 years ago