| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| amck | "I can actually provide a, perhaps, useful comment to your drone question. One reason I chose to use the 130IS was that it is very light. Mine wei..." | Read more » | over 7 years ago | |||
| cfastie | "I'm not sure how different the NIR signal will be when using a Rosco #2007 vs. #19 or other red filter. Both will allow capture of some distributio..." | Read more » | over 7 years ago | |||
| amck | "Thanks for the reply Chris. Your observations are very insightful. My thoughts are currently toward reproducing some of your tests with hooking u..." | Read more » | over 7 years ago | |||
| cfastie | "I see what you mean about the green channel being almost as bright as the red channel. The Rosco 2007 filter blocks almost as much green as red, so..." | Read more » | over 7 years ago | |||
| cfastie | "Alex, The two filters are probably the same. The #19 filter will work best if the you do a custom white balance on the camera before you take photo..." | Read more » | over 7 years ago | |||
| nedhorning | "The image for this note with the blue color was probably a JPEG image white balanced using red paper. The raw image will have much higher values in..." | Read more » | over 7 years ago | |||
| agustin_castellano | "Thanks Ned. I have a red filter (600nm) and the filter color is red and the pictures that i take with this filter are red why you have a similar fi..." | Read more » | over 7 years ago | |||
| nedhorning | "Hi Agustin - I have a feeling the problem with with the calibration targets you are using. The targets I sued for this note were scanned by a labor..." | Read more » | over 7 years ago | |||
| agustin_castellano | "Hi Ned me again, could be that the analisys that you did it was over the image without the red filter? because when i read the article i understand..." | Read more » | over 7 years ago | |||
| agustin_castellano | "Hi ned! I would like to ask you how do you setup the camera? I have a canon power shot a490 with red filter, i try to a similar test but with bud r..." | Read more » | over 7 years ago | |||
| harrysafraz | "Yes drag and drop would be fine " | Read more » | almost 8 years ago | |||
| peauproductions | "Hello Ned, can you please contact me: nolan@peauproductions.com. We have a new dual-band NDVI filter and would like to ask you some questions, tha..." | Read more » | almost 8 years ago | |||
| warren | "I believe that if Cindy had pressed Fastie colormap instead of step 3, she would have gotten the same result as Chris's first image -- perhaps a sl..." | Read more » | almost 8 years ago | |||
| cfastie | "I can't help much with the infragram.org process. It seems to be pretty easy to produce an image that doesn't have any obvious relationship to the ..." | Read more » | almost 8 years ago | |||
| warren | "So I wonder if we should not show the colorize button until you press "run"? Is there any situation where you'd want to colorize before pressing ru..." | Read more » | almost 8 years ago | |||
| warren | "Hi, Cindy - let me try to follow your steps and note what I think you've done in each one. Note that if you think one step is really not intuitive,..." | Read more » | almost 8 years ago | |||
| nfliu | "Cannot log in with my old account. Thank you very much for your reply and suggestions. I think you well explained what I am confused about. Yes, I ..." | Read more » | almost 8 years ago | |||
| nedhorning | "Hi Nanfeng, I'm not certain why the results look the way they do but I have a feeling that it could be a result of doing pixel-by-pixel comparison..." | Read more » | almost 8 years ago | |||
| Nanfeng | "Also, I put three figures to show the raw (i.e., bayer), jpg images and the jpg-raw DN correlation. " | Read more » | almost 8 years ago | |||
| Nanfeng | "Hi Ned, This is a really nice work. I have a couple of questions about the conversion between the DNs of JPEG images and that of raw images. The F..." | Read more » | almost 8 years ago | |||
| funkycbj | "I just used a StellarNet spectrometer to find the transmittance of hot filters from the Canon A2200 & A2500. Both hot filters rapidly fall off ..." | Read more » | almost 8 years ago | |||
| gpenzo | "Hallo John. Based on wikipedia you need 531 and 570 nm filters. I checked arround and I could not find those filters. I saw 540nm and 580nm http://..." | Read more » | almost 8 years ago | |||
| gpenzo | "More info see another note: http://publiclab.org/notes/gpenzo/03-25-2015/ndvi-cape-for-the-beagle-bone " | Read more » | almost 8 years ago | |||
| jhon | "Hi gpenzo From Colombia... I would like to know how I can get the filter for such cameras to build a camera in order to obtain the index PRI. Th..." | Read more » | almost 8 years ago |