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> White is 0x00FFFFFF or 255,255,255 Calling this a falsehood isn't even beginning to describe the problem: - does not distinguish between a white surface (ref
by moring 4y ago
> White is 0x00FFFFFF or 255,255,255
Calling this a falsehood isn't even beginning to describe the problem:
- does not distinguish between a white surface (reflects all light) and a white emitter (emits blackbody radiation in a specific temperature range)
- there is no maximum intensity for emitted light, but there is a maximum for reflection
- RGB (255,255,255) does not produce a blackbody curve -- though it can cause the same reaction as a blackbody curve for people with exactly three working cone types. This point may be wrong on this list because it may be thought of as a solved problem.
- RGB (255,255,255) does not specify the temperature
- that is before monitors even start being imperfect
Oh, and a general one: An emitted color (e.g. monitor) and a reflected color (e.g. printout) cannot be the "same", ever, because only the latter depends on how it is illuminated.
- taneq 4y agoWhat about RGB (256, 256, 256) though? Edit: Oops, I read "there is a maximum for reflection - RGB (255,255,255)" as one statement rather than two fragments but I still like my response. :P
- otikik 4y agoI always understood OxFFFFFF to be “give me all you’ve got”. Of course a quasar is going to be able to emit more powerful photons than a 90s CRT. But if said quasar had a GUI, 0xFFFFFF would mean “master blaster”, and the same for the old screen. My expectation as a programmer was never that the colors would have any semblance of “realism” or “uniformity”, and to expect variance from machine to machine. Perhaps since I have not involved myself with photography software and kept my budget for displays below the thousands-per-unit this has held true so far
- moring 4y agoWhat I tried to say by that is that "give me all you've got" is the only kind of maximum a screen can do, and a brighter screen (or a quasar) will be brighter. OTOH, "reflect everything" is the absolute maximum for reflection, and no other object will top that.
- yetihehe 4y ago> OTOH, "reflect everything" is the absolute maximum for reflection, and no other object will top that. Maybe some old night scopes with photon amplifiers could be coaxed into making "over 100% reflective" mirrors? A fun idea to reasearch.
- astrange 4y agoAny monitor can simulate HDR ("brighter than 255") images by simply darkening the rest of the picture around them. Also, in TVs it's 16-235 not 0-255. They're not even 8-bit!
- rr888 4y ago> An emitted color (e.g. monitor) and a reflected color (e.g. printout) cannot be the "same", ever, because only the latter depends on how it is illuminated. Surely there is a case when the light coming into your eye is the same for both? If the printout is lit by the monitor wouldn't it be the same?
- rocqua 4y agoThe colors can be the 'same' under a specific illumination condition. Standards that help make sure prints look like your screen specify the illumination condition of viewing, and then demand the spectrum radiating from the screen and paper 'look' the same. Often this is a daylight lamp shining on the paper with a specified intensity, in an otherwise dark room (I believe) compared to watching the screen in a specific ambient light (again daylight with a given intensity).
- moring 4y agoThere is sometimes the expectation to get a printout that looks the same as the image on screen in any illuminating condition. The whole process of designing printed material (or, say, a passive billboard) on a computer has to constantly avoid making that assumption.