68kMLA Classic Interface
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| Click here to select a new forum. | | Apple Performa Plus Display M9102LL/D | Posted by: Shinobi Kenobi on 2026-03-16 17:39:58
I just reinstalled Photoshop for the first time in a long time, and I'm configuring the gamma. Does anyone know what type of phosphors this exact model used? I guess I don't HAVE to set it to the correct ones, but I would like to. The service manual doesn't specify that info.
The available choices are:
EBU/ITU
HDTV (CCIR 709)
NTSC (1953)
P22-EBU
SMPTE-C (CCIR 601-1)
Trinitron | Posted by: adespoton on 2026-03-17 10:56:54
The display appears to be a Goldstar-built 14" shadow-mask CRT. These types of monitors were generally using the 1.8-gamma color space.
The choices you list are all incorrect; most are for non-Mac devices, with the Trinitron being the exception -- but your display is NOT a Trinitron display. Your best bet would be to generate your own ICC profile; if that's not an option, setting gamma to 1.8 will likely get you "close enough". | Posted by: Shinobi Kenobi on 2026-03-17 19:38:37
Thank you. If you don't mind, how did you find this info? | Posted by: adespoton on 2026-03-18 07:46:53
Started with duck.ai to find the original sources, then looked those up to corroborate 🙂 First round gave me a bunch of inaccurate junk, so it took a few minutes of digging. Helped that I also vaguely remember going through all this ~30 years ago, so I knew when I was on the right track -- but in my case, I used a Sony Trinitron monitor, not a Goldstar one, so that bit was easier (except at the time, everything assumed you were using a Goldstar monitor, and the gamma curve for the Trinitrons was notably different -- messed things up for me until I realized 1.8 was NOT right for me. | | 1 |
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