| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| nedhorning | "Can you post one of your RAW images? I looked at Image1.dng and that shows the Bayer pattern so it needs to go through a debayer process to create ..." | Read more » | almost 6 years ago | |||
| Corymbia | "How do you make sure the white balancing step is omitted? I tried that myself (see table 3 and figure 5 in my note), but the resulting NDVI values ..." | Read more » | almost 6 years ago | |||
| nedhorning | "I use RAW pixel values for calibration analysis and since white balance doesn't impact RAW values I don't usually worry about it. If you want to us..." | Read more » | almost 6 years ago | |||
| Corymbia | "Thanks, I will try! One more problem I noticed yesterday was that (at least when I set the white balance on a red/white surface) the red channel g..." | Read more » | almost 6 years ago | |||
| nedhorning | "The calibration coefficients are, in the simplest case, the slope and y-intercept of the linear regression line for wavelength (based on calibratio..." | Read more » | almost 6 years ago | |||
| Corymbia | "Thanks for the advice. How are the calibration coefficients calculated? I need to take photos of >50 trees in a glasshouse, so even within one s..." | Read more » | almost 6 years ago | |||
| nedhorning | " If you're using them for calibration you should be fine taking photos of the targets every so often. The calibration coefficients shouldn't change..." | Read more » | almost 6 years ago | |||
| Corymbia | "I realised that my tiles may be too shiny and grabbed some matt paint samples (pieces of matt paper) from a local store. They’re small and light, m..." | Read more » | almost 6 years ago | |||
| nedhorning | "I just read over Rob Sumner's RAW guide and see Adobe DNG Converter is free. It also looks like he did some pretty rigorous tests so my previous co..." | Read more » | almost 6 years ago | |||
| nedhorning | "The tables look great. Before the end of the week I'll try to compare your converted image with on that I run through dcraw to see if they are simi..." | Read more » | almost 6 years ago | |||
| Corymbia | " Hi Ned, Thanks for your comment, it was mainly your notes that inspired my camera conversion :) I (hope I) fixed the tables by inserting print sc..." | Read more » | almost 6 years ago | |||
| nedhorning | " Hi Corymbia – It’s nice to see some new work in this area. I see that you used the Adobe DNG converter. You might want to look into that to under..." | Read more » | almost 6 years ago | |||
| Corymbia | "Hi Chris, I made a simple test earlier today, so far only managed to look at the JPEG file data (I have an old code for reading DNG into Matlab (ba..." | Read more » | almost 6 years ago | |||
| cfastie | " One photo every 50 shots might be sufficient. It depends on how much the light changes during that time (5 minutes?, an hour?, a day?). You might ..." | Read more » | almost 6 years ago | |||
| Corymbia | " Hi Chris, Thanks for your answer! Very helpful. 1) Regarding the reflectance targets. I bought a dozen of ceramic tiles in different colours (inc..." | Read more » | almost 6 years ago | |||
| cfastie | " You are correct that your multi-day observation will present some problems. It is possible that doing a custom white balance on each day will comp..." | Read more » | almost 6 years ago | |||
| Corymbia | " Hi Chris, Many thanks. I managed to get a DB660/850 filter and should have my camera (Olympus E-M10 Mark II) converted this week. It did cost an a..." | Read more » | almost 6 years ago | |||
| cfastie | "The primary advantage of dual band filters is that they pass much narrower bands of wavelengths than red or blue filters (which also pass NIR). Th..." | Read more » | almost 6 years ago | |||
| Corymbia | "Hi, thanks for the post. I'm planning to re-convert my NIR-adapted camera (currently with a blue filter) due to its rather poor performance in dete..." | Read more » | almost 6 years ago | |||
| cagiva | "@cfastie, You were absolutely correct. The Blue card from PublicLab arrived today so I redid the white-balancing calibration with it and I got much..." | Read more » | almost 6 years ago | |||
| cagiva | "Hi @Tbtouaki Was your NDVI balloon mapping a research project? Were you able to publish the results in a paper or blog? Best, ~~Al " | Read more » | almost 6 years ago | |||
| cfastie | "Performing a custom white balance on a blue-filtered NIR camera fools the camera into exaggerating the brightness of the red channel. The red chann..." | Read more » | almost 6 years ago | |||
| Chus | " Gracias, Xose, me animas!! He pensado mezclar IR+ espectroscopía, voy a probar y si me sale algo aceptable lo publicaré. Saludos!! " | Read more » | about 6 years ago | |||
| xose | "Fantástico upgrade entonces! Creo que manazas y esto que has hecho no son muy compatibles ;D " | Read more » | about 6 years ago |