On Wed, 2021-12-29 at 12:19 -0700, home user wrote: > I wonder how many people don't even know about them, and use them > without knowing it, as was the case for me. To me, the idea of a zero-width line would mean non-printing, so I would avoid it. In fact, when I print tables and charts, one of the things I experiment with is quite thin lines and not 100% black, as they tend to make tables ugly and more cluttered. > Color perception is complex and tricky. I'm a long-time collector > of fluorescent minerals. My collection is big. Color perception is > important in this hobby. A book(*) that I read many years ago > talked about color perception. I remember context (my term) being a > part of that. Time also matters. Most monitors are sRGB, which > covers less than 50% of the range of colors people can see. I've > longed for much better color gamuts for monitors for a long time. Perception certainly is a huge part of it. What you view adjacent to an object affects how you perceive it. e.g. The old butcher's trick of putting green plastic around their meat display to make it look redder. Most monitors (and various video systems) have a very limited gamut, they rely on contrasts between things to avoid looking dull. Cameras do the same thing, and often deliberately emphasise contrasting colours to try and make things pop out at you. You can see that with news bulletins where they've done night filming, and there'll be a black halo around deep blue lighting (where the system has overcompensated). When it comes to monitors, the actual tint (or hue) of the red phosphor isn't pure red. Not only isn't it 100% saturated red, but it's often not red (on most old domestic CRT TVs it actually verged towards orange). Likewise, with the blue and green phosphors not being 100% mono-chromatic, and not being precisely the same tint on each screen. Apart from meaning you couldn't get pure, or accurate colours, it meant each screen looked different. You get similar impreciseness whether it's CRT, plasma, or LCD. Also, there's a limit to the range between the dimmest visible emissions and the brightest possible ones. There's a technical limit to how much they can emit, as well as compete with ambient lighting, and as to how much you want to see. e.g. You don't want super bright emissions when viewing TV in a dark room, it hurts your eyes. One of the tricks employed by TV/monitor manufacturers to say they've improved their colour gamut is to have increased the possible emission brightness further (therefore increased the range of possible colours). Yet, you can rarely use that full range, the super bright is too bright. And many things are filmed to use the full contrast range no matter what the scene is. It only tends to be the arty directors that shoot for more realistic look: A bright sunny day gets a full-contrast picture, indoors gets less contrast. Where you could have set up your wide-range display to show both nicely. Translate that back to computer displays: When typing black text on white background (representing what you'll eventually print on paper). You don't want 100% burning bright white background simulating your paper background, on a super-bright emitting screen. But that's how most things are usually set up. Then, when you look at a photo on the same set-up, it looks oddly too dim (because it is, comparatively speaking). Word processors ought to let you display a non-100% white typing background, one that the printer isn't going to try and print. -- uname -rsvp Linux 3.10.0-1160.49.1.el7.x86_64 #1 SMP Tue Nov 30 15:51:32 UTC 2021 x86_64 Boilerplate: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the mailing list. _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
