Shaders on real CRTs - Revision history

Ahayri at 21:07, 15 June 2026

2026-06-15T21:07:09Z

← Older revision		Revision as of 21:07, 15 June 2026
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	On 31+kHz PC CRT monitors displaying in high-resolution modes, most filters/shaders should work fine as-is, as most were intended for output scaled 3× or higher.		On 31+kHz PC CRT monitors displaying in high-resolution modes, most filters/shaders should work fine as-is, as most were intended for output scaled 3× or higher.

Ahayri at 19:34, 13 June 2026

2026-06-13T19:34:57Z

← Older revision		Revision as of 19:34, 13 June 2026
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	You can combine those things with these two shader presets: [https://github.com/libretro/common-shaders/blob/master/cgp/tvout/tvout.cgp tvout.cgp] for 240p and [https://github.com/libretro/common-shaders/blob/master/cgp/tvout%2Binterlacing/tvout%2Binterlacing.cgp tvout+interlacing.cgp] for 480p. Both allow you to apply adjustable signal-resolution blur horizontally, as well as color controls like gamma and saturation, and the option to use TV color range (16–235) instead of PC color range (0–255), while the 480p version provides a scanline shader that is interlaced on 480-line content. The signal-resolution blur works best if you use a large horizontal resolution (1280 or higher recommended) while keeping your vertical resolution at 240 or 480, and set the emulator's aspect ratio to stretch to fit. The higher horizontal resolution will make it look natural and convincing, avoiding banding issues. These can be combined with NTSC filters/shaders for maximum authenticity; check out the shader presets in [https://github.com/libretro/common-shaders/tree/master/cgp/tvout /cgp/tvout] and [https://github.com/libretro/common-shaders/tree/master/cgp/tvout%2Binterlacing /cgp/tvout+interlacing] for some examples.		You can combine those things with these two shader presets: [https://github.com/libretro/common-shaders/blob/master/cgp/tvout/tvout.cgp tvout.cgp] for 240p and [https://github.com/libretro/common-shaders/blob/master/cgp/tvout%2Binterlacing/tvout%2Binterlacing.cgp tvout+interlacing.cgp] for 480p. Both allow you to apply adjustable signal-resolution blur horizontally, as well as color controls like gamma and saturation, and the option to use TV color range (16–235) instead of PC color range (0–255), while the 480p version provides a scanline shader that is interlaced on 480-line content. The signal-resolution blur works best if you use a large horizontal resolution (1280 or higher recommended) while keeping your vertical resolution at 240 or 480, and set the emulator's aspect ratio to stretch to fit. The higher horizontal resolution will make it look natural and convincing, avoiding banding issues. These can be combined with NTSC filters/shaders for maximum authenticity; check out the shader presets in [https://github.com/libretro/common-shaders/tree/master/cgp/tvout /cgp/tvout] and [https://github.com/libretro/common-shaders/tree/master/cgp/tvout%2Binterlacing /cgp/tvout+interlacing] for some examples.

			=References=
			{{reflist\|2}}

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Ahayri: /* Shaders on real CRTs */

2026-06-13T19:33:25Z

Shaders on real CRTs

← Older revision		Revision as of 19:33, 13 June 2026
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	~~== Shaders on real CRTs ==~~
	On 31+kHz PC CRT monitors displaying in high-resolution modes, most filters/shaders should work fine as-is, as most were intended for output scaled 3× or higher.		On 31+kHz PC CRT monitors displaying in high-resolution modes, most filters/shaders should work fine as-is, as most were intended for output scaled 3× or higher.

Ahayri: Created page with "== Shaders on real CRTs == On 31+kHz PC CRT monitors displaying in high-resolution modes, most filters/shaders should work fine as-is, as most were intended for output scaled 3× or higher. However, on CRT monitors (and 15kHz CRTs) displaying in low-resolution modes like 240p or 480p, you will find that many of them won't work correctly due to the low output resolution. In these cases, you should use shaders that are applied only on the horizontal axis, only make change..."

2026-06-13T19:33:18Z

Created page with "== Shaders on real CRTs == On 31+kHz PC CRT monitors displaying in high-resolution modes, most filters/shaders should work fine as-is, as most were intended for output scaled 3× or higher. However, on CRT monitors (and 15kHz CRTs) displaying in low-resolution modes like 240p or 480p, you will find that many of them won't work correctly due to the low output resolution. In these cases, you should use shaders that are applied only on the horizontal axis, only make change..."

New page

== Shaders on real CRTs ==
On 31+kHz PC CRT monitors displaying in high-resolution modes, most filters/shaders should work fine as-is, as most were intended for output scaled 3× or higher.

However, on CRT monitors (and 15kHz CRTs) displaying in low-resolution modes like 240p or 480p, you will find that many of them won't work correctly due to the low output resolution. In these cases, you should use shaders that are applied only on the horizontal axis, only make changes to color output without scaling, or those that add scanlines/interlacing for 480p output.

You can combine those things with these two shader presets: [https://github.com/libretro/common-shaders/blob/master/cgp/tvout/tvout.cgp tvout.cgp] for 240p and [https://github.com/libretro/common-shaders/blob/master/cgp/tvout%2Binterlacing/tvout%2Binterlacing.cgp tvout+interlacing.cgp] for 480p. Both allow you to apply adjustable signal-resolution blur horizontally, as well as color controls like gamma and saturation, and the option to use TV color range (16–235) instead of PC color range (0–255), while the 480p version provides a scanline shader that is interlaced on 480-line content. The signal-resolution blur works best if you use a large horizontal resolution (1280 or higher recommended) while keeping your vertical resolution at 240 or 480, and set the emulator's aspect ratio to stretch to fit. The higher horizontal resolution will make it look natural and convincing, avoiding banding issues. These can be combined with NTSC filters/shaders for maximum authenticity; check out the shader presets in [https://github.com/libretro/common-shaders/tree/master/cgp/tvout /cgp/tvout] and [https://github.com/libretro/common-shaders/tree/master/cgp/tvout%2Binterlacing /cgp/tvout+interlacing] for some examples.