| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 » | over 9 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 9 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 9 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 9 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 » | almost 11 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 » | almost 11 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 » | almost 11 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 » | almost 11 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 » | almost 11 years ago | |||
| Dongjie | "cfastie, yes, I am referring for that. Thanks for your information. :) " | Read more » | about 11 years ago | |||
| cfastie | "Dongjie, are you referring to the gigapans? They are gigapans embedded here from gigapan.com. " | Read more » | about 11 years ago | |||
| Dongjie | "cool, how do you make the figure like Google streetmap? " | Read more » | about 11 years ago | |||
| nathanathan | "I've started experimenting with phosphorescent paint. Here's a link to a note on what I've done so far. " | Read more » | about 11 years ago | |||
| nathanathan | "I recently ordered a smartphone spectrometer, measuring glow in the dark pigment spectra seems like a fun project to try it out on. I'll give it ..." | Read more » | about 11 years ago | |||
| cfastie | "For some reason it's hard to find spectra of glow-in-the-dark pigments. Really, a thousand Public Lab spectrometers out there and no one has done t..." | Read more » | about 11 years ago | |||
| nathanathan | "I would like to know how glow in the dark paint compares to LEDs. Postcards with glow in the dark rainbows painted on them could be packaged with s..." | Read more » | about 11 years ago | |||
| cfastie | "Would the LED have to be placed outside the entrance slit? Otherwise the grating would form an image of the entire bulb. Standard single color LED..." | Read more » | about 11 years ago | |||
| warren | "I'm interested in something similar for spectrometer exposure calibration -- putting an LED and battery inside each spectrometer, on one side, so y..." | Read more » | about 11 years ago | |||
| mathew | "cool test! this is definitely the most pixels in a research note, as far as I've seen. " | Read more » | about 11 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 » | about 11 years ago | |||
| warren | "It's weird because we think of green being reflective, but compared to IR, it's very absorbent. " | Read more » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 years ago |