I’m sending color to an arduino and I’d like to send the entire rgb value in one byte. It’s easy to translate this from rgb values. Something like:
int color = ((b&255 & 0xC0)+((g&255 & 0xE0) >> 2)+((r & 0xE0) >> 5))&0xFF;
But once you get that byte to the arduino, you need to convert it back to an RGB value if you are doing anything useful with neopixels or whatever, so here’s the conversion chart. The keys are the number corresponding to the 8 bit color (0-255):
["0,0,0", "35,0,1", "71,1,2", "107,2,6", "142,4,10", "178,6,16", "214,9,21", "249,13,27", "1,35,2", "36,36,2", "71,36,4", "107,36,7", "142,37,12", "178,38,17", "214,39,22", "249,40,28", "5,71,6", "37,71,6", "72,71,8", "107,72,11", "143,72,15", "178,72,20", "214,73,24", "249,73,30", "11,107,13", "39,107,14", "73,107,15", "108,107,18", "143,107,21", "179,108,24", "214,108,28", "250,108,33", "18,143,22", "42,143,22", "75,143,23", "109,143,24", "144,143,27", "179,143,30", "214,143,33", "250,143,37", "26,178,30", "46,178,30", "77,178,31", "110,178,32", "145,178,34", "180,179,36", "215,179,39", "250,179,42", "undefined", "51,214,38", "79,214,39", "112,214,40", "146,214,41", "181,214,43", "216,214,46", "251,214,48", "undefined", "56,250,46", "82,250,46", "114,250,47", "147,250,49", "182,250,50", "217,250,52", "252,250,55", "1,5,83", "36,6,83", "71,6,84", "107,7,84", "142,9,85", "178,11,86", "214,14,87", "249,17,88", "2,37,84", "36,37,84", "71,38,84", "107,38,84", "142,39,85", "178,39,86", "214,40,87", "249,42,88", "6,72,84", "37,72,84", "72,72,85", "107,72,85", "143,73,86", "178,73,87", "214,74,88", "249,74,89", "12,107,85", "40,107,85", "73,108,86", "108,108,86", "143,108,87", "179,108,88", "214,108,89", "250,109,90", "19,143,87", "43,143,87", "75,143,87", "109,143,88", "144,143,88", "179,143,89", "214,144,90", "250,144,92", "26,179,89", "46,179,89", "77,179,89", "110,179,90", "145,179,90", "180,179,91", "215,179,92", "250,179,94", "undefined", "51,214,92", "79,214,92", "112,214,92", "146,214,93", "181,214,94", "216,215,95", "251,215,96", "undefined", "56,250,95", "82,250,95", "114,250,96", "148,250,96", "182,250,97", "217,250,98", "252,250,99", "4,20,167", "37,20,167", "72,21,167", "107,21,167", "143,22,168", "178,24,168", "214,25,168", "249,27,169", "6,43,167", "37,43,167", "72,43,167", "107,44,167", "143,44,168", "178,45,168", "214,46,169", "249,47,169", "9,75,167", "39,75,167", "73,75,167", "108,75,168", "143,76,168", "178,76,168", "214,77,169", "249,77,169", "15,109,168", "41,109,168", "74,109,168", "108,109,168", "143,110,168", "179,110,169", "214,110,169", "250,111,170", "21,144,169", "44,144,169", "75,144,169", "109,144,169", "144,145,169", "179,145,169", "215,145,170", "250,145,171", "28,180,169", "47,180,169", "77,180,170", "111,180,170", "145,180,170", "180,180,170", "215,180,171", "251,180,172", "undefined", "52,215,171", "80,215,171", "112,215,171", "146,215,171", "181,215,172", "216,215,172", "251,215,173", "undefined", "57,250,172", "83,250,172", "114,250,173", "148,251,173", "182,251,173", "217,251,174", "252,251,174", "undefined", "undefined", "undefined", "undefined", "undefined", "undefined", "undefined", "undefined", "12,52,251", "40,52,251", "73,53,251", "108,53,251", "143,53,251", "179,54,251", "214,54,252", "250,55,252", "15,80,251", "41,80,251", "74,80,251", "108,81,251", "143,81,251", "179,81,251", "214,82,252", "250,82,252", "19,113,251", "43,113,251", "75,113,251", "109,113,251", "144,113,251", "179,113,252", "214,114,252", "250,114,252", "25,147,252", "45,147,252", "76,147,252", "110,147,252", "145,147,252", "180,147,252", "215,147,252", "250,148,253", "31,181,252", "49,181,252", "78,181,252", "111,181,252", "146,182,252", "180,182,253", "215,182,253", "251,182,253", "undefined", "53,216,253", "81,216,253", "113,216,253", "147,217,253", "181,217,253", "216,217,254", "251,217,254", "undefined", "58,252,254", "84,252,254", "115,252,254", "148,252,254", "182,252,254", "217,252,255", "255,255,255"]