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[EXTERNAL] [rasterio] Applying Color Ramp to Single-Band Grayscale Images
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Hare, Trent M
Nathan,
Not sure about using rasterio, but have you tried gdaldem using "color-relief"?
shows creating a colorized image and adding hillshade (hillshade step not needed here):
-Trent
From: main@rasterio.groups.io <main@rasterio.groups.io> on behalf of nathan.raley via Groups.Io <nathan.raley@...>
Sent: Tuesday, March 24, 2020 3:12 PM To: main@rasterio.groups.io <main@rasterio.groups.io> Subject: [EXTERNAL] [rasterio] Applying Color Ramp to Single-Band Grayscale Images Does anyone have any methods of applying a color ramp to a grayscale image?
I have a NDVI calculated image I am trying to apply color ramp for the decimal based value ranges, but have no idea how to accomplish this. I was wandering if this was possible via any of the rasterio libraries, and, if so, how would one go about accomplishing this? I have other band based calculations I'd like to attempt, but until I can figure out how to apply the color ramps, I am at a stand still. Thanks, |
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nathan.raley@...
Thanks Trent,
I have looked into that, but the part of using the colormap.txt portion still is a bit confusing. I haven't been able to find sufficient documentation on how to create that file to apply the color, or a ramp between two color ranges, for the values. I did find a method in the python wrapper library for gdal that supported creating a color ramp for ranges using a specified color; however, that only supported whole number values and not the float based values you get from the NDVI image. |
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nathan.raley@...
Actually, that second link looked like he had the format where it was using decimal based values, that might work. I'll give it a try. Thanks!
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