undefined | Better HN

0 pointsviler5y ago0 comments

(Author of the script here): appreciate the observations. Pretty much all of these parameters (scanline intensity/sharpness, pixel blur, glow/halation, blackpoint for the background) can be adjusted to taste in the configuration files. :)

I tried to show the range of possibilities in the screenshots/video samples, e.g. higher-res EGA/VGA with no visible scanlines, and some amber monitor shots with deeper blacks, etc. Admittedly, this script is geared more towards simulating lower-resolution CRTs - mostly because my approach entails a large oversampling of the input.

0 comments

2 comments · 1 top-level

kiwidrew5y ago· 1 in thread

I'm impressed with the results from your lo-tech batch file approach. The output is really quite nice.

It turns out that real CRTs also have a number of user-adjustable parameters, which of course makes it impossible to define any sort of "canonical" or most-accurate preset. :)

(Like this weird paper-white monochrome CRT that uses P7 phosphor, designed for 350-line MDA but can also handle a greyscale 15.7khz 200-line CGA input... the scanlines are so sharp that it looks 100% fake!)

vilerOP5y ago

Yup, multisync/multi-scan sure complicates things. :)

I'd still like to give it enough flexibility so that a preset can at least be accurate to a particular mode of operation. I actually went down the rabbit hole of looking up a precise persistence curve for the P39 phosphor (as used in the IBM 5151) - found conflicting data, but a friend will be helping out with a video and an ad-hoc program to get some results, so we'll see!

j / k navigate · click thread line to collapse