Check out my first novel, midnight's simulacra!
Theory and Practice of Sprixels: Difference between revisions
From dankwiki
| Line 77: | Line 77: | ||
==Color quantization== | ==Color quantization== | ||
The Kitty protocol accepts arbitrary RGBA 32-bit words in the sRGB color space; our natural internal format is 24bpp RGB plus two bits of alpha, so that's great—our colorspaces match. Sixel is a palette-indexed format. Common sizes are 16-, 256-, and 1024-entry palettes (in XTerm, this is controlled with the <tt>numColorRegisters</tt> X resource). Palettes are independent unless the <tt>privateColorRegisters</tt> resource is | The Kitty protocol accepts arbitrary RGBA 32-bit words in the sRGB color space; our natural internal format is 24bpp RGB plus two bits of alpha, so that's great—our colorspaces match. Sixel is a palette-indexed format. Common sizes are 16-, 256-, and 1024-entry palettes (in XTerm, this is controlled with the <tt>numColorRegisters</tt> X resource). Palettes are independent unless the <tt>privateColorRegisters</tt> resource is explicitly set false). A color quantization step is thus necessary (note that this these quantizations can be performed in perfect parallelism when split across multiple frames/images, but not necessarily within a single frame). There are five essential color quantization algorithms: | ||
[[File:Penrosetiling.png|thumb|200px|right|These images throw libsixel for a loop; <tt>img2sixel</tt> chugs along, and then generates no output.]] | [[File:Penrosetiling.png|thumb|200px|right|These images throw libsixel for a loop; <tt>img2sixel</tt> chugs along, and then generates no output.]] | ||
