Hello @Christian-Me
I had missed the appearance of the Chroma node. Since I use deconz with the CIExy format and the other color converters do not support this format, I tried your node.
What I noticed, it doesn't apply gamma correction to the RGB values, which makes the color more vivid and more the like the color displayed on the screen of your device.
There is a script here that takes gamma corrections into account. I use this in a function node if necessary.
For comparison two photos of my kitchen lamp with the color "Aquamarine". The first shows the result with the script and the second shows the color output of the Chroma node.
[{"id":"aedc8dc1bb0a4216","type":"inject","z":"e6bdcf44.09a93","name":"aquamarine","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":"","topic":"aquamarine","payload":"aquamarine","payloadType":"str","x":2010,"y":3980,"wires":[["e2c8f9a0f25e112e"]]},{"id":"48fa3a9691147a97","type":"inject","z":"e6bdcf44.09a93","name":"orange","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":"","topic":"orange","payload":"orange","payloadType":"str","x":2030,"y":4020,"wires":[["e2c8f9a0f25e112e"]]},{"id":"c33d35f907e37390","type":"inject","z":"e6bdcf44.09a93","name":"aquamarine","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":"","topic":"aquamarine","payload":"aquamarine","payloadType":"str","x":2010,"y":4080,"wires":[["7f73d562ae464bd4"]]},{"id":"f8ec4f03112c1e26","type":"inject","z":"e6bdcf44.09a93","name":"orange","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":"","topic":"orange","payload":"orange","payloadType":"str","x":2030,"y":4120,"wires":[["7f73d562ae464bd4"]]},{"id":"7f73d562ae464bd4","type":"chroma","z":"e6bdcf44.09a93","name":"RGB object","outFormat":"rgb","array2object":true,"floatOutput":true,"inputRelativeValues":"percent","outputRelativeValues":"percent","x":2350,"y":4100,"wires":[["43ed3cf5c3fd815c"]]},{"id":"e2c8f9a0f25e112e","type":"chroma","z":"e6bdcf44.09a93","name":"CIExy object","outFormat":"CIExy","array2object":true,"floatOutput":true,"inputRelativeValues":"percent","outputRelativeValues":"percent","x":2350,"y":4020,"wires":[["0009377fdcfa91dc"]]},{"id":"0009377fdcfa91dc","type":"function","z":"e6bdcf44.09a93","name":"","func":"var x = msg.payload.x;\nvar y = msg.payload.y;\nmsg.payload = [x, y];\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":2520,"y":4020,"wires":[["c185eba5a4089bde"]]},{"id":"43ed3cf5c3fd815c","type":"function","z":"e6bdcf44.09a93","name":"RGB_CIE","func":"// @ts-nocheck\nfunction rgb_to_cie(red, green, blue)\n{\n\t//Apply a gamma correction to the RGB values, which makes the color more vivid and more the like the color displayed on the screen of your device\n\tvar red \t= (red > 0.04045) ? Math.pow((red + 0.055) / (1.0 + 0.055), 2.4) : (red / 12.92);\n\tvar green \t= (green > 0.04045) ? Math.pow((green + 0.055) / (1.0 + 0.055), 2.4) : (green / 12.92);\n\tvar blue \t= (blue > 0.04045) ? Math.pow((blue + 0.055) / (1.0 + 0.055), 2.4) : (blue / 12.92); \n\n\t//RGB values to XYZ using the Wide RGB D65 conversion formula\n\tvar X \t\t= red * 0.664511 + green * 0.154324 + blue * 0.162028;\n\tvar Y \t\t= red * 0.283881 + green * 0.668433 + blue * 0.047685;\n\tvar Z \t\t= red * 0.000088 + green * 0.072310 + blue * 0.986039;\n\n\t//Calculate the xy values from the XYZ values\n\tvar x \t\t= (X / (X + Y + Z));\n\tvar y \t\t= (Y / (X + Y + Z));\n\t\n\t//var z = Z;\n\n\tif (isNaN(x))\n\t\tx = 0;\n\tif (isNaN(y))\n\t\ty = 0;\t \n\t//return [x, y, z];\n\treturn [x, y];\n}\nmsg.payload = rgb_to_cie(msg.payload.r, msg.payload.g, msg.payload.b);\nconsole.log(msg.payload);\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":2520,"y":4100,"wires":[["c185eba5a4089bde"]]},{"id":"c185eba5a4089bde","type":"debug","z":"e6bdcf44.09a93","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":2690,"y":4060,"wires":[]}]
Maybe you could support gamma correction in a future update for the CIExy format.
Thanks a lot!
