can we have gamma-correct image-resizing

[mtc]

because sRGB is non[physical(energy)]-linear when resizing you might get differently from...

Luminance-Chroma color-spaces based on it are also affected (YCbCr YUV)

maybe hard for me to explain, see links:

​http://forum.doom9.org/showthread.php?t=160038
​http://blog.johnnovak.net/2016/09/21/what-every-coder-should-know-about-gamma/
​https://ninedegreesbelow.com/photography/linear-gamma-blur-normal-blend.html#
​https://github.com/webmproject/libwebp/blob/b62cdad287ef265de189247f406cc3516eee97f0/doc/webp-container-spec.txt#L505
​https://userbase.kde.org/krita/manual/colormanagement
​https://docs.krita.org/Gamma_and_Linear
​https://cloud.githubusercontent.com/assets/72159/11488537/3da372b4-97bf-11e5-93d1-7b0923a0a973.png
​http://www.nies.ch/doc/it/monitor.en.php

​https://photo.stackexchange.com/questions/53725/what-is-the-purpose-of-gamma-correction-in-todays-screens-and-how-does-it-relat

​http://www.lagom.nl/lcd-test/gamma_calibration.php

​http://www.lbodnar.dsl.pipex.com:80/imaging/gamma.html
​http://forum.doom9.org/archive/index.php/t-172094.html

[mtc]

​http://www.synth.in/2016/07/your-scaling-software-sucks.html
resizing the image might.. (vs no-scaling)

​https://www.gimp-forum.net/Thread-Linear-Gamma-RGB-Color-Space

​http://int64.org/projects/resamplehq/
sRGB gamma-skewed

RGBlinear gamma-compensating scaling

[mtc]

​http://ptgmedia.pearsoncmg.com/imprint_downloads/peachpit/peachpit/lightroom4/pdf_files/LightroomRGB_Space.pdf
​http://www.webupd8.org/2013/10/gimp-29-210-development-builds.html

​https://discuss.pixls.us/t/users-guide-to-high-bit-depth-gimp-2-9-2-part-2/534
​https://discuss.pixls.us/t/help-linear-color-space-not-working/3718

​https://ninedegreesbelow.com/photography/patched-gimp-compared-to-default-gimp.html

preceptual-uniform isnt physical-radiometric-linear

[mtc]

​https://graphicdesign.stackexchange.com/questions/64890/in-gimp-how-do-i-get-the-smudge-blur-tools-to-work-properly

[mtc]

​http://www.realtimerendering.com/blog/tag/gamma/
​http://filmicworlds.com/blog/gamma-and-mipmapping/
​http://http.developer.nvidia.com:80/GPUGems3/gpugems3_ch24.html

[mtc]

maybe barely (usually not much) affects dithering accuracy in very coarse palettes

[mirh]

This still results in the wrong image.

ffmpeg -i gamma-1.0-or-2.2.png -vf "scale=w=iw/2:h=ih/2" -vframes 1 -c:v bmp rules.bmp

Possibly related to #9772 too?