| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| GFFchris | "Hello, I wanted to ask if anyone has an idea on how to order the Rosco filter to Europe / Germany? Many Thanks! " | Read more » | almost 9 years ago | |||
| cfastie | "The Bayer filters determine how wavelengths are separated into the three color channels. This is how the camera can sense the balance between the t..." | Read more » | almost 9 years ago | |||
| poo | "this green photo don't Relevance to Bayer pattern Mr. @cfastie ? " | Read more » | almost 9 years ago | |||
| cfastie | "Black surfaces do not reflect much light, but they do reflect some. Some black surfaces might reflect more green than other colors, and other black..." | Read more » | almost 9 years ago | |||
| poo | "hi. I have a question. when I set a black paper or black thing in custom white balance, and then i take a photo, why my photo become a green photo?..." | Read more » | almost 9 years ago | |||
| LaPa | "ok, i have to solve some problems of remote link of the Raspberry before taking other photos. And, of course, I have to buy a red filter because th..." | Read more » | almost 9 years ago | |||
| cfastie | "LaPa, yes that would be very useful. It would also be useful if someone could do that with a red filter on the NoIR. Blue should be exaggerated whe..." | Read more » | almost 9 years ago | |||
| LaPa | "Hi Chris thank you for the suggestions! Do you think would it be a good idea take a set of photos (NoIR camera + blue filter) of the plant graduall..." | Read more » | almost 9 years ago | |||
| cfastie | "Those basil leaves should not be the same color as the flower pot. They need to be more orange. To get NDVI values in the appropriate range, the va..." | Read more » | almost 9 years ago | |||
| LaPa | "At the moment I took a photo two plants in sunny light. But I didn't manage to take another without gain because it became cloudy :(. Is it possib..." | Read more » | almost 9 years ago | |||
| LaPa | "Thank you cfastie, I seem that your post encourages me to keep on this way; I ask confirmation about this. Do you have any idea how to modify the p..." | Read more » | almost 9 years ago | |||
| cfastie | "That orange color of the leaves is promising. It should be even oranger. If you can put the plant in brighter outdoor light and take two photos -- ..." | Read more » | almost 9 years ago | |||
| LaPa | "anyway I try awbg. I wrote in the terminal "raspistill -awb off -awbg 0.88,0.97 and I took a picture of the tester and a two plants. The light was ..." | Read more » | almost 9 years ago | |||
| LaPa | "Actually I don't know if it is possible mount two modulo cam in 1 Raspberry because it has just 1 slot to mount a modulo cam. I'll find out more ab..." | Read more » | almost 9 years ago | |||
| cfastie | "It is not clear that the other respondents at the Pi forum understand what you are asking about. Using awb_gains will allow every photo to exaggera..." | Read more » | almost 9 years ago | |||
| LaPa | "What do you think about this way to proceed? https://www.raspberrypi.org/forums/viewtopic.php?p=856005#p856005 " | Read more » | almost 9 years ago | |||
| cfastie | "Thanks Erwan, It looks like awb_gains allows the red and blue channels to be adjusted relative to one another which is just what is needed. Howeve..." | Read more » | almost 9 years ago | |||
| Erwan | "hi, Did you trying this with picamera ? https://picamera.readthedocs.org/en/release-1.10/api_camera.html Here there are some possibility to parame..." | Read more » | almost 9 years ago | |||
| cfastie | "LaPa, The custom white balance procedure you refer to works only for certain cameras. A year ago it was not possible to set a custom white balance..." | Read more » | almost 9 years ago | |||
| cfastie | "It will probably be possible to give you some guidance if you attach a couple of the photos straight from the camera. Chris " | Read more » | over 9 years ago | |||
| cfastie | "RQ, The white balance looks good. I think those are the settings used by Public Lab. But experimenting with similar numbers could produce better r..." | Read more » | over 9 years ago | |||
| cfastie | "The angle from which the photo is taken and the angle of the sun do influence the NDVI result. NDVI values are a function of how much red and NIR l..." | Read more » | over 9 years ago | |||
| kykytos | "Is it important the station in which the photo is taken? I mean, how do you differ infrared reflected radiation from infrared emitted radiation (th..." | Read more » | over 9 years ago | |||
| khufkens | "Good point, I might use this approach to see if I can get better results on my PRI sensor. Things were funky and this offset in response (differenc..." | Read more » | over 9 years ago |