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{{Main|List of shaders and filters}}
===LCD Shaders===
[[File:Lcd-grid.png|thumb|256px|cgwg's lcd-grid-v2 shader with GBA colors.]]
These replicate the look of a low-resolution LCD common on handhelds. These can range from a simple grid drawn around the pixels to a detailed recreation of each pixel's RGB subpixels. May also include motion blurring to simulate ghosting and washed out color gamuts.
This For LCDs these replicate the look of a low-resolution LCD common on handhelds. These can range from a simple grid drawn around the pixels to a detailed recreation of each pixel's RGB subpixels. May also include motion blurring to simulate ghosting and washed out color gamuts.[[File:Dot.png|thumb|right|[https://github.com/libretro/common-shaders/blob/master/handheld/dot.cg dot.cg]]][[File:Lcd.png|thumb|left|[https://github.com/libretro/common-shaders/tree/master/handheld/lcd-shader lcd]]][[File:Lcd3x.cgp png|thumb|centre|[https://github.com/libretro/common-shaders/blob/master/handheld/lcd3x.cg lcd3x.cg]]][[File:Lcd-grid.png|thumb|left|256px|cgwg's lcd-grid-v2 shader with GBA colors.]][[File:Gb.png|thumb|189px|right|GameBoy Shader with default palette. Other palettes are available.]][[File:Gameboy.png|thumb|centre|[https://github.com/libretro/common-shaders/tree/master/handheld/gameboy Gameboy], replicates the dot matrix screen of a Game Boy, complete with the ghosting problems to reproduce certain visual effects. Made by Harlequin. Requires [[RetroArch]].]]
These are shaders designed A technique used to detect increase the amount of colour and smooth [[dithering]]shading that can be produced on a system. [https://githubThe effect is achieved by using lines or dots which are then blurred by the low quality NTSC signals (composite or RF) used by the system.com/libretro/common===Anti-shaders/tree/master/dithering mdapt] is a popular onealiasing===A graphics rendering technique used to reduce or eliminate jagged or stepped edges (aliasing artefacts). There is also a newer gdaptIt works by applying various methods such as super-sampling, multi-sampling, or post-processing filters to improve the smoothness and visual quality of the image, particularly when displaying diagonal lines, curves, or fine details.
This shader is supposed to appear Shaders that scale the same as the nearest neighbor (aka "unfiltered"), except with minor corrections when using a non-integer scale that is increasingly less noticeable image within the higher it is scaledviewport. This shader is can be useful to anyone who wants to keep things as sharp as possible without worrying about scale factors. Available in [https://github.com/hizzlekizzle/quark-shaders/tree/master/Pixellate.shader Quark] and [https://github.com/libretro/common-shaders/blob/master/retro/shaders/pixellate.cg Cg] shader formats. A newer alternative that does the same thing (but may give sharper results) is the sharp-bilinear shaderfor ensuring a certain quality of scaling, which prescales often with the image to a high resolution, then downscales using bilinear intention of applying other effects on top that are picky about scaling.
==Types==
[[File:Crt-geom.png|thumb|190px|crt-geom-flat.cg, a popular CRT shader.]]
===CRT Shaders===
These software filters replicate the signals that consoles output to the TV. They vary in quality, with the lowest quality being RF, then composite, then S-Video, and then RGB (SCART) being the highest quality. Many emulators have blargg's NTSC filter libraries<ref name="blargg">http://slack.net/~ant/libs/ntsc.html</ref> built into them. They can also be separately downloaded in filter plugin format.
===Game Boy ShaderHandhelds===[[File:GbThese shaders replicate the visuals of the Dot matrix and LCD displays of older handhelds and their specific artifacts in comparison to newer screens.png|thumb|189px|GameBoy Shader with default palette. Other palettes are available.]]
===Smoothing shaders===
These shaders, such as 2xSai, Super Eagle, Super 2xSai, scaleX, HQx, xBR and xBRZ attempt to reduce the pixelation by smoothing and rounding. They can cause a lot of false positives and distortions, however, scaling the image 2x or 3x using nearest neighbor, then applying the smoothing shader will reduce the intensity of the smoothing by keeping the pixel shapes intact, eliminating most distortions while keeping a fairly smooth look.
====Lanczos====
[https://github.com/libretro/common-shaders/blob/master/lanczos/lanczos4.cg lanczos4.cg], [https://github.com/libretro/common-shaders/blob/master/lanczos/lanczos6.cg lanczos6.cg], [https://github.com/libretro/common-shaders/blob/master/lanczos/lanczos12.cg laczos12.cg], [https://github.com/libretro/common-shaders/blob/master/lanczos/lanczos16.cg laczos16.cg]
[[File:Lanczos12.png|thumb|right|200px|lanczos12.cg]][[File:Lanczos4.png|thumb|left|200px|lanczos4.cg]][[File:Lanczos6.png|thumb|centre|200px|lanczos6.cg]]
[[File:Lanczos16.png|thumb|centre|200px|lanczos16.cg]]
====Bicubic====
Enlarges images by calculating the colour values of new pixels based on a weighted average of neighbouring pixels in the original image. Popular for its ability to produce smooth, high-quality results when resizing images, especially when significant upscaling is required.
{| class="wikitable"
! scope="col" style="text-align: center;"|Name
! scope="col" style="text-align: center;"|Image
! scope="col" style="text-align: center;"|
Description
|-
| style="text-align: center;"|[https://github.com/libretro/common-shaders/blob/master/bicubic/bicubic-fast.cg bicubic-fast.cg]
| style="text-align: center;"|
| style="text-align: center;"|
|-
| style="text-align: center;"|[https://github.com/libretro/common-shaders/blob/master/bicubic/bicubic-normal.cg bicubic-normal.cg]
| style="text-align: center;"|
| style="text-align: center;"|
|-
| style="text-align: center;"|[https://github.com/libretro/common-shaders/blob/master/bicubic/bicubic-sharp.cg bicubic-sharp.cg]
| style="text-align: center;"|
| style="text-align: center;"|
|-
| style="text-align: center;"|[https://github.com/libretro/common-shaders/blob/master/bicubic/bicubic-sharper.cg bicubic-sharper.cg]
| style="text-align: center;"|
| style="text-align: center;"|
|}
====DDT====
Data-Dependent Triangulation Shaders look at the square plane formed by the four nearest neighbours (a basic image resizing technique that assigns each pixel in the resized image the colour value of the nearest pixel in the original image). They divide the square plane into two triangular planes. The pixels are bilinearly interpolated using only the three points of the triangles to which they belong.
[[File:Ddt-waterpaint.png|thumb|left|[https://github.com/libretro/common-shaders/blob/master/ddt/ddt-waterpaint.cg ddt-waterpaint.cg]]][[File:Ddt.png|thumb|right|[https://github.com/libretro/common-shaders/blob/master/ddt/ddt.cg ddt.cg]]][[File:Ddt-extended.png|thumb|centre|[https://github.com/libretro/common-shaders/blob/master/ddt/ddt-extended.cg ddt-extended.cg]]]
====Hqx====
("hq" stands for "high quality" and "x" for magnification) is a pixel art scaling algorithm developed by Maxim Stepin and used in emulators such as Nestopia, bsnes, ZSNES, Snes9x, FCE Ultra and many more. There are 3 hqx filters: hq2x, hq3x and hq4x, which scale by a factor of 2, 3 and 4 respectively.
[[File:Hq2x.png|thumb|left|[https://github.com/libretro/common-shaders/blob/master/hqx/hq2x.cg hq2x.cg]]][[File:Hq4x.png|thumb|right|[https://github.com/libretro/common-shaders/blob/master/hqx/hq4x.cg hq4x.cg]]]
====Eagle====
[[File:Super-eagle.png|thumb|right|[https://github.com/libretro/common-shaders/blob/master/eagle/super-eagle.cg super-eagle.cg]]]
===Dithering===
{{Main|Dithering#Shaders}}
[[File:Advanced-aa.png|thumb|left|200px|[https://github.com/libretro/common-shaders/blob/master/anti-aliasing/advanced-aa.cg advanced-aa.cg]]]
[[File:Fx-aa.png|thumb|right|200px|[https://github.com/libretro/common-shaders/blob/master/anti-aliasing/fx-aa.cg fx-aa.cg]]]
[[File:Fxaa-edge-detect.png|centre|thumb|200px|[https://github.com/libretro/common-shaders/blob/master/anti-aliasing/fxaa-edge-detect.cg fxaa-edge-detect.cg]]]
[[File:Reverse-aa.png|thumb|centre|200px|[https://github.com/libretro/common-shaders/blob/master/anti-aliasing/reverse-aa.cg reverse-aa.cg]]]
===Pixellate===
[[File:Pixellate.png|thumb|200px]]
This shader is supposed to appear the same as the nearest neighbor (aka "unfiltered"), except with minor corrections when using a non-integer scale that is increasingly less noticeable the higher it is scaled. This shader is useful to anyone who wants to keep things as sharp as possible without worrying about scale factors. Available in [https://github.com/hizzlekizzle/quark-shaders/tree/master/Pixellate.shader Quark] and [https://github.com/libretro/common-shaders/blob/master/retro/shaders/pixellate.cg Cg] shader formats. A newer alternative that does the same thing (but may give sharper results) is the sharp-bilinear shader, which prescales the image to a high resolution, then downscales using bilinear scaling.
===Auto-box===
[[File:Box-max.png|thumb|left|200px|[https://github.com/libretro/common-shaders/blob/master/auto-box/box-max.cg box-max.cg]]]
[[File:Sharpen-lighter-box.png|thumb|right|200px|[https://github.com/libretro/common-shaders/blob/master/auto-box/sharpen-lighter-box.cg sharpen-lighter-box.cg]]]
===Border===
