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 | ||
|---|---|---|---|---|---|
| mrodriguezorejuela | "Hi there. Are there any csv files for the other colormaps? I'm specifically looking for the Physics and its variation ones. Thanks! " | Read more » | over 6 years ago | |||
| Endure1 | "Is this conversion the reason a dual camera setup doesn't necessarily require calibration? " | Read more » | almost 7 years ago | |||
| cfastie | "The text file attached above gives the correct RGB values for the NDVI_VGYRM lookup table. I put an image of the NDVI_VGYRM color gradient in my an..." | Read more » | almost 8 years ago | |||
| Jtaw | "update : I used the lookup table above and did not give me a good result. I hope it is not the colormap used by infragram and there is something el..." | Read more » | almost 8 years ago | |||
| Jtaw | "The lookup table will do for me. I'll try to generate an equation from this one. thanks a lot! " | Read more » | almost 8 years ago | |||
| cfastie | "I think the algorithm to convert a blue- or red-filtered NIR photo to color NDVI is something like this: Start with a color photo in which one ch..." | Read more » | almost 8 years ago |