Viridis Approximation for RGB565

viridis_approx.ipynb

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    "viridis_approx = [\n",
    "  \"#440154ff\", \"#440558ff\", \"#450a5cff\", \"#450e60ff\", \"#451465ff\", \"#461969ff\",\n",
    "  \"#461d6dff\", \"#462372ff\", \"#472775ff\", \"#472c7aff\", \"#46307cff\", \"#45337dff\",\n",
    "  \"#433880ff\", \"#423c81ff\", \"#404184ff\", \"#3f4686ff\", \"#3d4a88ff\", \"#3c4f8aff\",\n",
    "  \"#3b518bff\", \"#39558bff\", \"#37598cff\", \"#365c8cff\", \"#34608cff\", \"#33638dff\",\n",
    "  \"#31678dff\", \"#2f6b8dff\", \"#2d6e8eff\", \"#2c718eff\", \"#2b748eff\", \"#29788eff\",\n",
    "  \"#287c8eff\", \"#277f8eff\", \"#25848dff\", \"#24878dff\", \"#238b8dff\", \"#218f8dff\",\n",
    "  \"#21918dff\", \"#22958bff\", \"#23988aff\", \"#239b89ff\", \"#249f87ff\", \"#25a186ff\",\n",
    "  \"#25a584ff\", \"#26a883ff\", \"#27ab82ff\", \"#29ae80ff\", \"#2eb17dff\", \"#35b479ff\",\n",
    "  \"#3cb875ff\", \"#42bb72ff\", \"#49be6eff\", \"#4ec16bff\", \"#55c467ff\", \"#5cc863ff\",\n",
    "  \"#61c960ff\", \"#6bcc5aff\", \"#72ce55ff\", \"#7cd04fff\", \"#85d349ff\", \"#8dd544ff\",\n",
    "  \"#97d73eff\", \"#9ed93aff\", \"#a8db34ff\", \"#b0dd31ff\", \"#b8de30ff\", \"#c3df2eff\",\n",
    "  \"#cbe02dff\", \"#d6e22bff\", \"#e1e329ff\", \"#eae428ff\", \"#f5e626ff\", \"#fde725ff\",\n",
    "];"
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     "text": [
      "viridis_approx_565 = [\n",
      "  0x400a,0x402b,0x404b,0x406c,0x40ac,0x40cd,\n",
      "  0x40ed,0x410e,0x412e,0x416f,0x418f,0x418f,\n",
      "  0x41d0,0x41f0,0x4210,0x3a30,0x3a51,0x3a71,\n",
      "  0x3a91,0x3ab1,0x32d1,0x32f1,0x3311,0x3311,\n",
      "  0x3331,0x2b51,0x2b71,0x2b91,0x2bb1,0x2bd1,\n",
      "  0x2bf1,0x23f1,0x2431,0x2431,0x2451,0x2471,\n",
      "  0x2491,0x24b1,0x24d1,0x24d1,0x24f0,0x2510,\n",
      "  0x2530,0x2550,0x2550,0x2d70,0x2d8f,0x35af,\n",
      "  0x3dce,0x45ce,0x4ded,0x4e0d,0x562c,0x5e4c,\n",
      "  0x664c,0x6e6b,0x766a,0x7e89,0x8689,0x8ea8,\n",
      "  0x96a7,0x9ec7,0xaec6,0xb6e6,0xbee6,0xc6e5,\n",
      "  0xcf05,0xd705,0xe705,0xef25,0xf724,0xff24,\n",
      "]\n"
     ]
    }
   ],
   "source": [
    "def color565(r, g, b):\n",
    "  return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3)\n",
    "\n",
    "print('viridis_approx_565 = [')\n",
    "for ix, itm in enumerate(viridis_approx):\n",
    "    r, g, b = int(itm[1:3], 16), int(itm[3:5], 16), int(itm[5:7], 16)\n",
    "    c565 = color565(r,g,b)\n",
    "    if 0 == (ix % 6):\n",
    "        print('  ', end='')\n",
    "    print(f'{hex(c565)},', end='')\n",
    "    if 5 == (ix % 6):\n",
    "        print('')\n",
    "print(']')"
   ]
  },
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