Because of the specific alpha output, which is used later on. If i change this, then older preset won’t work any more.
Stock pass later on is needed to prevent serious mip-map related distorsions, at least with my drivers. It was added there for specific reasons.
Does this do anything to help my Crazy Taxi issue? (too much RL at the moment for me to check for a bit)
Can you please test some other options? Like if you disable interlacing and play with the internal resolution values? They influence the density of scanlines, more values are acceptable, if the vertical input resolution is high enough.
Hi @guest.r! First of all, I’d like to thank you for the excellent shader, I’ve been using it for many years and it’s my favorite.
I have a question regarding the Raster Bloom effect.
I’m trying to make the bloom more apparent for full screen flashing effects, like lightning in some RPGs or when shooting/getting shot in lightgun games like Time Crisis, while keeping it relatively stable for normal gameplay.
Ideally, I would like a high “Raster Bloom %” and a low “Raster Bloom Effect Smoothing” to make the bloom more dramatic and responsive, but increasing the “Raster Bloom %” makes the screen move too much during normal gameplay and trying to remediate this by increasing the “Raster Bloom Effect Smoothing” makes the bloom unresponsive for full screen effects.
Is there a way to adjust the Raster Bloom sensitivity/bias towards higher average picture brightness levels? Could this be an option?
Thanks!
Finally! Thanks @guest.r
I must say however that things seem very temperamental, with very slim margins among balancing artifacts, noticeable, undesirable flickering/noise in dither patterns and getting the now infamous “m” to look legible.
Disabling artifacting and fringing turns it into that smeared mess it was like before at Resolution Scale settings which fully blended dithering!
Increasing artifacting increases flickering, increasing fringing is even worse.
Deblur and Preserve edge colours played a significant role in taming some of the wilder artifacts.
Wish temporal effects could be more transparent though. Are things being affected by frame pacing issues/limitations in RetroArch?
maybe this article can be useful for some of you:
Developers Speak on Designing Game Artwork for CRTs | CRT Database
New Release Version (2025-11-11-r1):
Notable changes:
Original History or Source basedDownload link:
https://mega.nz/file/4xplxJbC#-MG9YcKMw3Hmx5rSLs_IT16zeaPCMSdmroyEAEV9ULY
Feature Example:
Original:
With Font Preservation:
Disclaimer:
Checkerboard and bar de-dithers usually apply very complex logic to dissolve dithering patterns, current implementation is quite simple, and works better with checkerboards. Still in “beta”. 
Just gave it a quick test, seems to work pretty well!
Just to clarify, the more negative I set the “Raster Bloom Smoothing Bright Deviation” the more sensitive it is to bright screens and vice-versa?
Yes, negative deviation values make the effect more jumpy with brighter screens.
that a very good update! thanks!
the font are indeed will be better with the new option
also I like the new Raster Bloom update
but I will not post a preset update yet, since it has crt-black_crush-koko which is not added to the slang repo yet
I second this, It works!
Would this resolve the issue @Jobima was having with interlaced content that wasn’t happening with the Phosphor Persistence shader?
@guest.r WOW, nailed it with this update. I was just thinking about this font problem the other day, I could never really get font edges to look completely right no matter how much I fiddled with the sharpness settings. This solves the problem!
I use Phosphor Persistence shader since it can be used after interlaced to do some Phosphor Persistence magic that help in reduce interlaced flickering, unless you mean this
I was just inquiring as to whether you could now use CRT-Guest-Advanced to do what you previously needed to use Phosphor Persistence for since these changes were implemented by @guest.r.
I tried the ntsc shader and I noticed an issue where the grass on a soccer stage on TT Acme Allstar on Genesis would be garbled during motion, as if Rainbow filter was enabled. HD shader version displays it fine in motion
Because shader has so many options, which is the one to disable that effect?
There are basically two options, one is to merge fields, other is to reduce fringing or maybe artifacting.
hi @guest.r
I wonder if it possible to have mixed interlace mode that will do mode 3 in moving areas and mode 4 in static parts of the frame, to kinda do adaptive deinterlacing
Thanks for the suggestion. You can also shed some light on the effect purpose, like when and where this should work better compared with regular interlacing.
It can also go an other way, like static interlacing with edges and dynamic for surfaces. This, for example, would reduce flickering etc…
in fact that what I want, mode 4 but if there are moving it will use mode 3 so it will not has comb, perhaps with few fading pixels that average both modes between the two areas to have homogeneous mix
edit: maybe its better to make the mix adaptive, which mean if the different in pixel between the previous frame and current frame was big it will overlay from mode 3, if it small it will merge (average) mode 4 with mode 3
