colormap
colormap

Colormaps are used to show details in monochrome (greyscale) images, by showing pixel intensity values using a wide range of colors instead of just from black => white. This makes finer details easier to see, although it may make it harder for colorblind viewers to read depending on the colors chosen. See https://publiclab.org/ndvi-gradients for a collection of common and useful colormaps by @cfastie. Some colormaps are not linear, meaning they use a set of color changes in one region of the scale to emphasize features with approximately that brightness. Colormaps are also known as "lookup tables" or LUTs, and the process overall is sometimes known as "false color" (alongside other color compositing techniques). Learn more in these posts: [notes:grid:colormap]...


Author Comment Last activity Moderation
jhondue123456 "https://www.google.com " | Read more » 3 months ago
shahdharam7 "@peter_mansson1 Nice work. The final goal here is to analyze the nutrient effect. Right? The normal camera (Raspberry pi camera) can also get th..." | Read more » almost 3 years ago
achita_ea "Hi @petter_mansson1 I can not use Cloud Upload in MainNDVI Thise error missing 2 required positional arguments : 'preNDVIFilepath' and 'timestamp' ..." | Read more » over 3 years ago
patalbright "Have you found your answer already or is there anyone else with a feedback on how to know when one found the best balance? :) pretty hard to find i..." | Read more » almost 4 years ago
nstarli "Hi Peter, you explained that you used the GUI to manually find your proper balance, however how did you actually quantify what made a good photo? " | Read more » almost 5 years ago
evan_lesmez "Lol wish I had saved the blue filter it shipped with " | Read more » almost 5 years ago
evan_lesmez "This is awesome I am working on implementing this into analyzing my hydroponic garden. Just got my piNoIr camera running & am looking through y..." | Read more » almost 5 years ago
warren " Hi! Just noting that this software stack I mentioned above is configured to run headlessly and to send video over WiFi, including NDVI processing:..." | Read more » about 5 years ago
petter_mansson1 "I use a combination of PILLOW, numpy and Matplotlib. You can also find all my camera settings in https://github.com/PiddePannkauga/ndviMachine. It ..." | Read more » about 5 years ago
jmdavison12 " Thanks Petter, I'm using a headless Raspberry Pi so I don't have the option of writing a GUI application (without networking the stream and severe..." | Read more » about 5 years ago
petter_mansson1 "Here is my repo for the GUI application. Run the script on your raspberry pi. Think you need to install a Tkinter library. At first I only created ..." | Read more » about 5 years ago
petter_mansson1 " I wrote a simple GUI application using TK for Python with 2 sliders to control AWB gains. That was my approach to finding a good balance. I don't ..." | Read more » about 5 years ago
jmdavison12 " " | Read more » about 5 years ago
jmdavison12 " Hi Peter, What red/blue gains did you use for these photos (I assume you are using picamera)? I know that lighting conditions vary and white bala..." | Read more » about 5 years ago
jmdavison12 "Dang, nice! Didn't realize this was possible with the blue filter that ships with the piNoIR. I can't believe how clear these results are. I'm als..." | Read more » over 5 years ago
petter_mansson1 " Hi Jacob, Cool! It would be interesting to compare ideas. I'm taking a single image, using the blue filter that came with the NoIR camera module..." | Read more » over 5 years ago
jmdavison12 " Wow, great work Peter! Have you not included the non-filtered image used to generate the single channel NDVI? or are you doing 'single image' NDVI..." | Read more » over 5 years ago
ankurp836 " Thanks for buddy Post " | Read more » over 5 years ago
warren "that'd be awesome. The image workflow we've built is javascript based, but it's also possible to use Pi Builder to produce reproducible python tool..." | Read more » over 5 years ago
petter_mansson1 " I was not aware of this. Very cool, I had an idea doing something of the same sort but it's better if we work together! I'd love to share what I'v..." | Read more » over 5 years ago
warren " Hi! This is awesome. Have you seen our Infragram Pi software, somewhat documented at: https://publiclab.org/infragram-pi https://publiclab.org/p..." | Read more » over 5 years ago
Bronwen " This is fantastic! Looking forward to seeing your conclusions! " | Read more » over 5 years ago
bansal_sidharth2996 " Hi, please submit your proposal on the GSOC official website at the earliest. Thanks " | Read more » over 5 years ago
bansal_sidharth2996 " I really like your proposal Few suggestions We are looking forwards for supportive folks. Make sure to do 1. at least one PR review each week and..." | Read more » over 5 years ago