65dBnoiseAug 16, 2023

Mars.

Processed, leveled, cropped MCZ_LEFT, FL: 110mm
Sol: 880, RMC: 43.0000, LMST: 12:07:17
Original: https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/00880/ids/edr/browse/zcam/ZL0_0880_0745060589_769EBY_N0430000ZCAM08882_1100LMJ01.png
Credit: #NASA/JPL-Caltech/ASU/65dBnoise

#Perseverance #Mars2020 #Solarocks #Space #crackedRocks

Show thread65dBnoiseAug 16, 2023

"There's more than one way to skin a cat"

The first image is part of an Arizona State University panorama composed from images captured on #Mars2020 Sol 4, "approximately simulating the colors of the scene that we would see if we were there viewing it ourselves."
https://mastcamz.asu.edu/galleries/mastcam-zs-first-high-resolution-mosaic-sol-4/?back=%2Fmars-images%2Fpanoramas-mosaics%2F%3Fitem_type%3D360-panoramas

The second image is the same but filtered for people with insensitivity to green.

When it comes to color perception or other sensory experience, things don't necessarily follow our preconceptions 😀

#GIMP

Mastcam-Z's First High-Resolution 360° Mosaic! (Sol 4) - Mastcam-Z

[Note: The banner image here is a lower-resolution MP4 movie file, and the JPEG available at the red button link below is a 1/3 resolution version. For full-resolution versions of this Mastcam-Z mosaic, click on the TIFF or PNG button below, and for additional versions of this panorama at full resolution, including 3-D anaglyphs for […]

Mastcam-Z
Show threadPaul HammondAug 16, 2023

@65dBnoise

Colour perception varies more than most people realise.

I guess the folk that set up some of the M20 cameras and their image pipelines appreciate the raw images on the mission server more than others.

#cantpleaseeveryone

Show thread65dBnoiseAug 16, 2023
@PaulHammond51
Indeed, those people definitely know better. And knowing better makes them show a number of different approaches to viewing, rather than sticking to one for all intents and purposes.
Show threadSimeon SchmaußAug 16, 2023
@65dBnoise @PaulHammond51 I agree that color perception can vary quite a lot between different people, however there is a pretty well established process for digital cameras here on earth to produce natural looking colors.
NASA doesn't apply any of those established processes to the Mastcam images.
And what they are doing instead is no substitute to this process, from my understanding it's plainly wrong to call the "natural color images" true to what the human eye would see.
Show thread65dBnoiseAug 16, 2023

@stim3on @PaulHammond51
My concern here is visual perception of Martian terrain and how a viewer can make the most out of it. So I take a "high altitude" view on the subject, caring most for the end result.

Anyone who has ever dived deeper than 10m (or has seen pictures/movies) knows that everything at that depth looks blue-green, despite fish and corals still being colorful. If one needs to understand what goes on at the bottom of the sea, presenting one ...

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Show thread65dBnoise

with an accurately calibrated picture does not help; most creatures, plants and other details will go unnoticed in a homogeneous color.

Same with Mars. I've seen numerous attempts to process Martian images "as one would see them if one were on Mars", most of them based on a preconception of a "red planet" giving a red/orange tint to everything. I doubt most such attempts are any close to what one would actually *perceive* when being/living there. Instead, most such attempts reduce ...

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Aug 16, 2023 at 5:19pmWeb