Improve whites in cira stretch

[mraspaud]

This PR improve the brightness of clouds in Cira stretch.

See comments for examples.

• Closes #xxxx
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[mraspaud]

Original cira stretch (main):

new version (this PR)

[coveralls]

Pull Request Test Coverage Report for Build 15021807021

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.326%

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Totals
Change from base Build 15005538775:	0.0%
Covered Lines:	55425
Relevant Lines:	57539

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💛 - Coveralls

[djhoese]

What sparked this change? I think this should be a separate enhancement or something configurable or I don't know. I don't like that this long standing enhancement is changing internally and in an "arbitrary"/non-math way. You could also use the enhancement that we've been using in Geo2Grid for a long time due to this same washed out cloud issue:

https://github.com/ssec/polar2grid/blob/93e3f63dc9cc0379ba3e83b3779ea2278dc9d7ac/polar2grid/etc/enhancements/abi.yaml#L2-L14

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.22%. Comparing base (4dd516f) to head (055238b).
Report is 81 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3130    +/-   ##
========================================
  Coverage   96.21%   96.22%            
========================================
  Files         396      398     +2     
  Lines       56910    57330   +420     
========================================
+ Hits        54756    55165   +409     
- Misses       2154     2165    +11     

Flag	Coverage Δ
behaviourtests	3.88% <0.00%> (-0.03%)	⬇️
unittests	96.31% <100.00%> (+<0.01%)	⬆️

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[ameraner]

Ping @strandgren if you also played around with similar things?

[mraspaud]

What sparked this change? I think this should be a separate enhancement or something configurable or I don't know. I don't like that this long standing enhancement is changing internally and in an "arbitrary"/non-math way. You could also use the enhancement that we've been using in Geo2Grid for a long time due to this same washed out cloud issue:

https://github.com/ssec/polar2grid/blob/93e3f63dc9cc0379ba3e83b3779ea2278dc9d7ac/polar2grid/etc/enhancements/abi.yaml#L2-L14

Yes, it's an arbitrary decision indeed.
The thought was clouds were looking grey, so we wanted to fix it, and do it at the same time as other changes triggered by the RGB workshop conclusions.
However, I just looked at the RGB workshop recipe for true color and it goes against what I did here (range 0-100, not 0-80 as implemented here), so I think I will go with what you suggest and make in configurable.