| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Have you attempted to do dual-camera red/IR photos? Or even just a regular visible-light photograph of the same worm to get the red channel? What ..." | Read more » | almost 11 years ago | |||
| cfastie | "The lack of differentiation really surprised me. The fact that hornworms fed a leaf-free diet turn blue is consistent with the idea that ß-carotene..." | Read more » | almost 11 years ago | |||
| warren | "Time to begin scanning them with a spectrometer! Don't you think there ought to be more differentiation there? " | Read more » | almost 11 years ago | |||
| cfastie | "I would encourage people to try to get the plants in their Infragram photos to be rather orange, like this: It might help to do the custom whi..." | Read more » | almost 11 years ago | |||
| cfastie | "In the camera you use in this example, press "Menu" while filling the scene with the blue paper. Then press Function/Set to begin taking photograph..." | Read more » | almost 11 years ago | |||
| warren | "BTW, this post is now the 7th most popular research note (by view count) on the site! " | Read more » | about 11 years ago | |||
| warren | "Another way to approach this is to standardize everything as much as possible, so it follows a well-described, simple, standard process, which we c..." | Read more » | about 11 years ago | |||
| cfastie | "Hi jalarid, Yes that is correct. There is lots of active development about which cameras and filters work best, and how to get the most meaningful ..." | Read more » | about 11 years ago | |||
| warren | "That's right, jalarid! " | Read more » | about 11 years ago | |||
| jalarid | "Hi, so if I am understanding this correctly I only need to remove the IR filter from my camera and replace it with Rosco #2007 VS Blue filter. At t..." | Read more » | about 11 years ago | |||
| mathew | "kykytos-- I put Chris out of the filter business . If you are interested in helping us do research on filters, please e-mail me. mathew at publiclab " | Read more » | about 11 years ago | |||
| cfastie | "kykytos, Sorry, I am out of the business of mailing #2007 filter. We are currently testing several different filters with different cameras to choo..." | Read more » | about 11 years ago | |||
| kykytos | "I'd like some of the Rosco filter too. Thanks! " | Read more » | about 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 » | about 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 » | about 11 years ago | |||
| liz | "@Jeff i really like this NDVI color gradient that replaces violet with black. " | Read more » | over 11 years ago | |||
| cfastie | "This set has the Rosco and the halogen. https://spectralworkbench.org/sets/show/366 " | Read more » | over 11 years ago | |||
| warren | "Can you link to the spectra so I can give it a try? Thanks. " | Read more » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 11 years ago |