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Lucie / minute @mntmn@mastodon.social
1y
why would an LG monitor choose to basically high pass filter the dark/shadow ranges depending on whether the 1080p mode is 50/60Hz (dark) or 75Hz (normal), even if everything is set to custom? even the gamma setting is the same. i've been watching unintentional film noir every night for months. maybe years? thanks, obscure forum post from 2008
gnome and mnt wallpaper on my "tv" at home (an lg monitor)
the same output, but the shadow of the logo looks totally different now and isn't black at all
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Lucie / minute @mntmn@mastodon.social
1y
something about broadcast color range or sth? but i guess that would have an opposite effect. anyway, someone who knows, please enlighten me! (i haven't yet checked if that's a rk3588 quirk, but i don't think so)
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Graham Sutherland / Polynomial @gsuberland@chaos.social
1y
@mntmn that does feel like a 16-235 range issue
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Lucie / minute @mntmn@mastodon.social
1y
@gsuberland yes, same. i have to find out where it's happening though, need to cross-check 50/60Hz modes on other monitors. apparently linux doesn't have a standard way of reporting which colorspace the hdmi tx is using
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Lucie / minute @mntmn@mastodon.social
1y
@gsuberland on my Dell, when setting 1920x1080p @ 50Hz, i also get a similar darkness. but not at 60Hz. but also at 100Hz. i'm sensing a driver issue after all
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erincandescent 💜 @erincandescent@erincandescent.net
1y
@mntmn @gsuberland limited vs full range isn't signalled by the HDMI transceiver

I don't remember the full rules but I think its something like: sRGB colourspace is identified by which EDID table the timing information came from. If it came from the CEA table, then sRGB modes are limited range (*unless the monitor is configured for "full range" mode which technically violates the HDMI specification); if it came from the "normal" EDID tables, then sRGB modes are full range. If you can, use YCbCr 4​:4:​4 mode and avoid this nonsense.
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Jeder neocat_floof_googly_woozy neocat_flag_agender @jeder@miau.jeder.pl
1y
@erincandescent @gsuberland @mntmn okay but then YCbCr is incredibly blurry and unreadable and colours are all fucked up compared to RGB
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erincandescent 💜 @erincandescent@erincandescent.net
1y
@jeder @gsuberland @mntmn you're thinking YCbCr 4​:2:​2 (which does chroma subsampling). YCbCr 4​:4:​4 does no chroma subsampling and should be approximately lossless
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Lucie / minute @mntmn@mastodon.social
1y
@erincandescent @gsuberland @jeder unfortunately, as far as i know, Linux/GNOME does not have UI for setting YCbCr 444 vs 422. also, all my planes are 30 bit color (2/10/10/10) for no reason according to drm_info. this is also not configurable or displayed anywhere
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Jeder neocat_floof_googly_woozy neocat_flag_agender @jeder@miau.jeder.pl
1y
@mntmn @gsuberland @erincandescent yeah that's my experience, which is annoying because my dell supports both YCbCr 444 and RGB but HDMI with amdgpu on linux still doesn't really want you to use RGB but that mess instead (so I migrated to displayport)
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