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Colorized Context Camera Images
jccwrt
post Oct 26 2020, 04:18 AM
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So jumping off from my project to figure out ChemCam plasma colors from LIBS spectra, I realized that the code I developed could be applied to convert CRISM spectra and I could make true-color/natural-color/false-color stretches of my choosing. The products I am currently creating from the Map-Projected Reduced Targeted Data Records are very similar to those produced by the team, although I think going this route saves me from needing to use a work copy of ENVI to use the data like I have in the past. The technique I am using is probably only a minor improvement on the official CRISM processing is in terms of reduced color noise, since this can incorporate every spectral channel into a product, rather than relying on a median value of 5 channels to create a channel for an RGB composite.

The raw output is a little boring (it's a more or less butterscotch/orange color) so I'm going the route of producing either enhanced true color products (each channel individually stretched, similar to the the TRU browse product produced by the CRISM team), or enhanced natural color products (where each channel is individually stretched, and the brightness of each color channel adjusted to match the color of Mars dust). Some examples

Enhanced natural color

Layered Deposits in Southwest Candor Chasma - Mars Reconnaissance Orbiter

Enhanced true color (similar to CRISM TRU product)

Layered Deposits in Southwest Candor Chasma - Mars Reconnaissance Orbiter

Infrared false color (800 nm to 2000 nm)

Layered Deposits in Southwest Candor Chasma - Mars Reconnaissance Orbiter


A couple of additional sites:


Columbia Hills - Mars Reconnaissance Orbiter


Chasma Boreale - Mars Reconnaissance Orbiter
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Steve G
post Oct 26 2020, 01:17 PM
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Amazing work! I just finished colourising almost 400 family pictures from the 1950s. It's an art and work of love.
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titanicrivers
post Jan 27 2022, 07:56 PM
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While not colorized this MRO CTX image https://www.jpl.nasa.gov/news/nasas-mro-fin...viously-thought and article in AGU Advances https://agupubs.onlinelibrary.wiley.com/doi...29/2021AV000534 provides interesting evidence that Mars may have had “surface waters forming chloride deposits continued through the Hesperian and into the Amazonian, making them among the latest-formed, large-scale deposits of water-related minerals on Mars.”
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