Holger Isenberg

Nice! Especially good to see that an adjustment from the calibration illuminant into higher temperatures causes smaller errors than into the lower temperature range. Even a shift of 500 to 1000K ...

With the SSF-based profile the Watson is already better than most NASA-published images I have seen so far. Only very few top-management presentations at NASA use color-profiled images. I have ...

The verification image now with your SSF-based profile applied at 3150K WB in Rawtherapee: https://areo.info/mars20/files/wsmacbetha005_hogan_3150k_ssf.png Looks perfect! The red is even better ...

Thanks, I'll run those through the same toolchain I used to create the previous two verification images. I just tried it on a different tool where the red now looked similar to my result with SSF, ...

I guess I understand now where my current approach of using ICC profiles with embedded sensor color balance has some inaccuracy and that was demonstrated with comparing your CC24-based profile for ...

No, as I try to just use dcamprof and argyllcms without doing my own calculations and Rawtherapee for displaying and applying the profile. Sure, I've just sent them for Watson as private message. ...

I now compared your matrix profile with my ICC profile visually in Rawtherapee on the test image: With your profile applied, the neutral patches match exactly 3150K blackbody equivalent. That would ...

Thanks! I'll compare the results with your matrix and my previously calculated profile and post it here. Indeed, the setting for the calibration image is not really optimal. Usually the target ...

And afterwards you can apply the profile to the raw images, available for example here for sol 46 in JPG format: https://pds-imaging.jpl.nasa.gov/data/mars2020/mars2020_imgops/data_watson_imgops/so ...

For the Perseverance Rover Watson camera a ColorChecker24 calibration image was now published on November 10 I see: http://www.unmannedspaceflight.com/index.php?showtopic=8603&view=findpost&p=259077 ...

It depends about whom you ask. I'm saying that it is on the technical engineering level unknown as there was never a spectrometer placed on the surface to measure it. At least no spectrometer ...

Sure, many I have read already, but all have the problem that there was never a spectrum measurement device on the surface usable for this purpose, i.e. something like a professional handheld ...

Sure, that's why it would be interesting to find out what's really the surface illuminant there on the surface as so far no photo spectrometer was brought to the surface to measure it. The current ...

Nice to see a technical discussion here ongoing about calibration of the Mars Rover cameras! I have recently created camera profiles for them (ICC and DCP) and currently working on improving them. ...