| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| kykytos | "I'd like some of the Rosco filter too. Thanks! " | Read more » | almost 11 years ago | |||
| cfastie | "Hi jaluna, NDVI tells us something about plant health because it quantifies the difference between light that is absorbed by plant pigments and use..." | Read more » | almost 11 years ago | |||
| jaluna | "Hello cfastie! I follow your job with interest, but there are a thing that I not understand well. You say "A filter can be used to block all red l..." | Read more » | almost 11 years ago | |||
| nedhorning | "Increasing dynamic range will go a long way in improving NDVI results in the shadows. There are some high-dynamic-range image processing methods th..." | Read more » | almost 11 years ago | |||
| cfastie | "Ned, your explanation suggests that exposure is critical. The shadow in the close-up is essentially the same as the ones in the gigapan - a shadow ..." | Read more » | almost 11 years ago | |||
| nedhorning | "Great shots. The impact of shadows on NDVI will vary with the darkness of the shadow. Lower pixel values (darker shadow) will be more likely to pro..." | Read more » | almost 11 years ago | |||
| liz | "@Jeff i really like this NDVI color gradient that replaces violet with black. " | Read more » | almost 11 years ago | |||
| cfastie | "This set has the Rosco and the halogen. https://spectralworkbench.org/sets/show/366 " | Read more » | almost 11 years ago | |||
| warren | "Can you link to the spectra so I can give it a try? Thanks. " | Read more » | almost 11 years ago | |||
| cfastie | "Jeff, Your first question: I subtracted the Rosco spectrum from the halogen light spectrum, but the result made no sense at all. So I just used the..." | Read more » | almost 11 years ago | |||
| warren | "I've been modifying lots of cameras with the new superblue filter (using the Rosco filter you sent). For those (like webcams) which don't have cust..." | Read more » | almost 11 years ago | |||
| PlanetenPaultje | "When I went to school in 1969 (something) the physics classroom was equipped with a big slide lantern that was installed by Siemens in 1925. It got..." | Read more » | almost 11 years ago | |||
| cfastie | "Brother Will, who sent me the lantern slides, asked a good question today: What is a lantern slide? I guess I should have assumed that many folks b..." | Read more » | almost 11 years ago | |||
| patcoyle | "Chris, what a thoughtful and informative piece. Delightful that you also had the R. W. Wood, infrared photographs show up in your mail box. " | Read more » | almost 11 years ago | |||
| warren | "Wow... he's a character who'd likely have gotten along with us... That's amazing that you have those plates! You said it was probably not the orig..." | Read more » | almost 11 years ago | |||
| warren | "Apparently, from my phone, not nearly well enough. There are disadvantages to a mobile friendly website... Using baseline subtraction in Spectral ..." | Read more » | almost 11 years ago | |||
| cfastie | "That's an excellent color table for the heat metaphor. This topic of how to display NDVI deserves much more attention. "It'd be neat to test the r..." | Read more » | almost 11 years ago | |||
| warren | "I've been messing with different NDVI gradients, and have been trying to get one which shows "cool" colors below zero, and doesn't circle back arou..." | Read more » | almost 11 years ago | |||
| geobduffy | "Thanks for the quick response. I'd be happy to be a Low Alt Aerial Photo Guinea Pig for testing :) " | Read more » | almost 11 years ago | |||
| cfastie | "Ned's plugin is available under downloads here: https://github.com/nedhorning/PhotoMonitoringPlugin. I still has a bit of a learning curve but offe..." | Read more » | almost 11 years ago | |||
| geobduffy | "Do you have a source for Ned's ImageJ plugin? I'm very curious about that. Also, I may have gotten ahead of myself with excitement...Do you think t..." | Read more » | almost 11 years ago | |||
| geobduffy | "Thank you for sharing this information. Your results are very promising. I am struggling to come up with a way to capture imagery that can be used ..." | Read more » | almost 11 years ago | |||
| warren | "Hi, Chris - i copied this down from YouTube but the version I got was a bit pixellated. Any way you could post the original so we can reduce copyin..." | Read more » | almost 11 years ago | |||
| donblair | "This is AMAZING. Am I seeing changes in individual plant photosynthesis levels when it passes in and out of shadow, or am I projecting? Really go..." | Read more » | almost 11 years ago |