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With the amazing images coming back from Juno's flyby of Io, I finally took a stab at processing some JunoCam images. This image shows Io's north polar region from 2839km distance.
flic.kr/p/2ppYk8v
Credit: NASA/JPL-Caltech/SwRI/MSSS/Simeon Schmauß
#Io #Jupiter #Juno #Astrodon #Solarocks #Space #Astronomy
Io - PJ57-23 - approximate true colors - HDR
JNCE_2023364_57C00022_V01 Capture time: 2023-12-30 08:37 UT Height above surface: 2839.6 km Jupiter's innermost moon Io as captured by the JunoCam instrument during Perijove 57.Flickr
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Simeon Schmauß
in reply to Simeon Schmauß • • •I processed this image from the individual framelets, which I preprocessed with a python script and then assembled in PTGui.
This allowed me to retain the complete horizon which is often lost with JunoCam images.
Simeon Schmauß
in reply to Simeon Schmauß • • •I also developed a color calibration for the JunoCam filters based on the CIE1931 color system. This allowed me to process the image in approximate true colors as the human eye would see them.
However, this wasn't an easy task because the JunoCam RGB filters don't match the spectral response of the human eye very well. Particularly the red filter is way too sensitive in the near infrared and Io's surface is especially reflective there.
Simeon Schmauß
in reply to Simeon Schmauß • • •In addition to the common ColorChecker 24 spectral target I used an Io reflectance spectrum (Spencer et. al. 1995), so I could better fit my calibration matrix to the spectral characteristics of Io.
Even with weighting the Io spectrum, my calibration only managed a dE of the Io reference target of 8.3 which really isn't great. That's why I'm only calling it an "approximate" true color image for now.
There is probably room for improvement by using more representative spectra.
Simeon Schmauß
in reply to Simeon Schmauß • • •@volcanopele's Galileo true color processing of Io.
I might try to process/calibrate some Galileo and Voyager images in the future.
planetary.org/articles/2629
Exposing Io's true colors
The Planetary SocietyTom Montgomery
in reply to Simeon Schmauß • • •Simeon Schmauß
in reply to Tom Montgomery • • •Tom Montgomery
in reply to Simeon Schmauß • • •With currently available transportation, the trip there is about 5 years, and, presumably another 5 to come back to Earth! 🚀
I think I'll be content with the amazing images that Juno is providing! 😃
Jacob Urlich 🌍
in reply to Simeon Schmauß • •Wöhnlich
in reply to Simeon Schmauß • • •