[Chris Wright]

I believe you are having multiple issues, that’s why it’s confusing. You are grading with a wide gamut monitor, but premiere ignores it.
AE with -> simulate display turned off(even with color management on) is acting as a ‘passthrough’ for your monitor, once again in dumb mode like premiere. that is problem#1

#2 is that youtube doesn’t do adobe rgb/p3. it does rec.709 or srgb gamma 2.2. its hdr can do rec.2020, but that’s different.

#3 vimeo is rec. 709 2.2 16-235 using broadcast pixel encoding. (don’t ask me why, its on their recommended encode page)

so.. to recap:
if you want AE to work for your monitor, set view-simulate display to your native color space of your monitor
if you want premiere to work with wide gamut, set lut from your native color monitor to rec. 709 2.2
if you want youtube, set monitor to rec. 709/srgb with fixes in previous thread inside chrome.( I haven’t tested firefox)
if you want vimeo, set same as youtube but encode as 16-235.
if you want video player, either set your monitor to rec. 709 or use a color managed player like madvr

[Chris Wright]

this is your problem right here…
“But my display is not set to a rec.709 profile. ”

you need to use an adobe RGB to rec. 709 2.2 gamma -or- P3 to rec. 709 transform LUT for EVERYTHING. even your browser doesn’t know what P3/adobe RGB is.
much less a 20 year old quicktime player.

[Chris Wright]

do you mean color grade?

[Chris Wright]

does your graphics card have a video gamma overide?
in premiere’s scopes, what does it say the black level is at?
did you try ae’s utility color profile converter to burn in rec. 709 16-235 input/output darker?
what is your monitor gamma set to?
premiere only understands 2.2. premiere isn’t affect by monitor gamma but web browsers are, could be a discrepancy there.

[Chris Wright]

glad to hear it smells better 😉

[Chris Wright]

depending on how bad it is, play around with the cineon effect, might get lucky with it and neatvideo. if there’s no rgb info, it will be grey at all values.

[Chris Wright]

when you setup dispcal, set it for lut. use that calibrated lut in premiere as premiere will not support any color profiles by os.
if your monitor is p3, premiere only understand srgb so a translation lut is required. vimeo is 16-235. youtube is 16-235 or 0-255 depending on many factors.(see item#1 below)

1. “going to your YouTube channel’s edit options, choosing ‘retouch’ for one of your videos, and then saving without even changing anything. Sometime in the next two to ten hours YouTube will re-encode it to VP9, and then it will display properly on most browsers.”
this thread has most of the youtube fixes.”
https://forums.adobe.com/thread/2297635

2. youtube
Solution/workaround to NVIDIA control panel’s dynamic range setting to 0-255 changing the appearance/gamma of YouTube-uploaded videos (even though other videos on YouTube don’t react to the setting):

3. https://f1.creativecow.net/10598/fixmyyoutube
it doesn’t work with adjustment layers directly
you have to use it in the dropdown for the export in adobe media encoder. or you can NEST it first.
its a premiere bug. also it needs to be copied in both premiere-lumetri-technical and adobe media encoder-lumetri-technical

4. VLC will match premiere exactly the same if you set its tools-prefs,video output to OpenGL to match premiere’s opengl . quicktime doesn’t use opengl so its going to wrong most of the time.

i have tested youtube inside chrome and it matches exactly from my monitor using a pixel sampler. I have tested using ame vs premiere, they both match
and import correctly. the main reason why this fails is that people have 3rd party video codecs installed on their computers. in medinfo, it should say quicktime RLE main or something similar, not lavsplitter or something weird.

[Chris Wright]

VLC tools-prefs, video output set to openGL will match openGL drivers from premiere.

[Chris Wright]

vimeo is 16-235 and youtube is 0-255. not confusing at all…

[Chris Wright]

this is better than adobe’s help files.^