Crt effects list

[DariusG]

Halo doesn’t exist on a real CRT, that’s a camera effect. Afterglow and glow do exist, glow in small amounts.

In fact many shaders try to imitate a photo screenshot of a CRT and won’t look at all like a real crt e.g. new-pixie. That’s mostly like a magazine photo of a CRT, exaggerating all effects and introducing others that don’t really exist like scalines rolling here and there. Looks pleasant and neat nevertheless, if not a bit heavy.

A real CRT looks mostly like crt-lottes, Another two-three shaders i wrote (promotion time) that look close to a real CRT are cyclon, gdv mini ultra Trinitron (parts of Guest.r code here), crt-pocket SLANG. I mean those were actually compared and developed alongside my 2 CRTs, 14" Trinitron and 20" slot mask.

[kokoko3k]

Couldn’t large halos be the effect of those cabs coming with a second glass? I mean, not the crt itself.

[DariusG]

It could have some reflection i guess.

[kokoko3k]

That’s for sure, but maybe If the second glass is not perfect, it could scatter or partially reflect light within its surface.

[DariusG]

who knows, it could even reflect environment light and more.

[Jobima]

@DariusG

In fact many shaders try to imitate a photo screenshot of a CRT and won’t look at all like a real crt

I also said this before

@Jobima

(that why I asked before to have professionally CRT Images database since not all shaders/presets people still has CRT/working-CRT and most people that still do have CRTs dont do shaders/presets stuff)

[PlainOldPants]

@PlainOldPants

When something bright is in the overscan area, there is a larger, brighter glow with some barely-visible rainbow. (This is a lesser-known effect, so I doubt anyone has posted an example.)

In my experience, glow on a CRT is not just a camera effect. As other people in this thread have suggested, it might be related to a dirty screen or some age/wear-related problems. Maybe a black matrix, microfilter, etc. might have an effect.

Or maybe I’m hallucinating this. Lol

On my 1985 and 1989 CRTs which have gray screens instead of deep black ones whenever powered off, they still have a bit of a gray afterglow even after powered off, showing a blurry afterimage of whatever was on-screen. When I turn the lights off in my room, the screen is still emitting (or reflecting?) a tiny, faint amount of light. This entire effect probably isn’t significant enough to consider emulating, but it’s worth thinking about in this discussion.

[alexb3d]

If it has to do with phosphorus but doesn’t mention the name of the effect, someone mentioned the name in a Vogon forum, but I can’t find it.

@anikom15

Halation is visible on cameras because cameras have a glass lens. On a normal CRT it should not be visible.

Saturated colors in digital cameras overwhelm the CMOS sensor, producing a ‘defect’ known as Blooming.

The halo of CRTs is somewhat different. Even though it is completely transparent, it always causes refraction, but in this case, they are not; they have a thin film. I suppose the reasons are: to appear flat, anti-static, and to darken the image (making blacks blacker).

In a well-lit environment, a monitor with gamma 1.8 cannot be perceived, but with the light off and a black background image, it is blatantly obvious. What’s more, if you look closely at the image, you can see the silhouette reflected in the glass.

This is not a memory, it is suffering; calibrating these monitors was painful.

[anikom15]

@PlainOldPants

On my 1985 and 1989 CRTs which have gray screens instead of deep black ones whenever powered off, they still have a bit of a gray afterglow even after powered off, showing a blurry afterimage of whatever was on-screen. When I turn the lights off in my room, the screen is still emitting (or reflecting?) a tiny, faint amount of light. This entire effect probably isn’t significant enough to consider emulating, but it’s worth thinking about in this discussion.

This is caused by the thermal contributor to phosphor decay (phosphor decay has three components), and I purposefully stop it from happening by forcing my phosphor shader to go down to 0. Otherwise it gets stuck due to a lack of floating-point precision.

There was a very good IEEE paper about the security issues of thermal after-images.

[Jobima]

I don’t know who will agree with me, but in my opinion, many CRT effects (and even analog video effects in general) add a dynamic and lifelike (teeming with life) quality to games. Perhaps we used to dislike these effects, characteristics, or even limitations, but today we appreciate their value after losing them in the age of digitization and ideal screens

I know I am not alone who felt this way, there are others

also I noted many younger peoples use effects that make their videos (in youtube or whatever) get analog artifacts or crt effects (especially scanlines or curves, and sometimes even masks) or even film artifacts although they did not live through those times, so this is not just a nostalgia

[Jobima]

about Convergence adjusting in flyback

I remember it was in SONY only, in other TVs it was Focus, or I am wrong?

anyway I kinda like a bit of misconvergence in shaders, it kinda give nice effect, also I think you can’t get 100% convergence in real CRT, at least there will be some differences around the screen areas