What are the RGBH, RGBS format constants ?

Steph328 · Messages: 52 Registration: 06.02.2003

SlammedE30 · Messages: 44 Registration: 09.23.2003

Under "format constants" , most of the naming convention makes sense, but what are the RGBH, RGBS ? and GRAYH, GRAHS ? I guess what do the "H" and "S" stand for ?

billycorgan · Messages: 85 Registration: 01.05.2003

H stands for half precision. Pixels are stored as 16 bit floating point numbers. S stands for single precision. Pixels are stored as 32 bit floating point numbers.

kalib0y · Messages: 2,982 Registration: 06.13.2001

Thanks . That makes sense too

Reed · Messages: 444 Registration: 05.01.2002

Ok, sort of related, but is there a reliable way to load exr , either half or full float into vapoursynth yet ? There are many exr variants, but the imagemagick plugin, lsmash, ffms2 all crash on the common ones But djv_view and FFMpeg can successfully process them - So is it a compiling issue , just not including the libraries , or something else ?

TooTall424 · Messages: 774 Registration: 04.18.2003

My piz exr files work fine with the image reader / image writer plugin (imwri). They are always 16bit full RGB though. I never tried 32bit (it's a bit of a weird extension to the exr format ) and I never tried chroma subsampling. Somewhere along the line you will probably loose floating point and go to integer though, because imagemagick is most often 16bit at its output

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What are the RGBH, RGBS format constants ?