Changes

'''GTU-Famicom''' is a variant<ref>https://github.com/libretro/common-shaders/tree/master/crt/shaders/GTU-famicom</ref> of the GTU CRT shader that emulates the NTSC NES/Famicom PPU. It requires the "raw" palette option in Nestopia , Mesen and FCEUmm [[libretro]] cores, which outputs<ref name="nestopia_raw">https://github.com/rdanbrook/nestopia/commit/9d58851a22eb3baeee7b4fe28ae8ffaac7eaa599</ref> chroma, level, and emphasis as red, blue, and green color channels. GTU-Famicom takes that output and processes it as an NTSC signal, which the shader decodes into RGB colors for display. The shader also emulates the full effects of RF/composite NTSC video signals, complete with artifacts, fringing, and color bleed, and optionally RF signal noise. Like with the GTU shader, the various signal resolution parameters can be tweaked so it can be made sharper, or made to have less color bleed by boosting chroma resolution.