java - RGB to CIE color conversion -


this question has answer here:

as said before (rgb philips hue (hsb)) i'm still not giving hopes converting simple rgb value value philips hue accept.

the official app iphone , android allows select color random photo , hue adjust accordingly. there must sort of formula.

this time think have found formula in interesting article online:

https://github.com/philipshue/philipshuesdk-ios-osx/blob/master/applicationdesignnotes/rgb%20to%20xy%20color%20conversion.md

i have been trying convert explanation java language, i'm not getting desired results. knows goes wrong?

for record i'm using philips hue light bulbs.

public static list<double> getrgbtoxy(color c) {         // hue bulb corners of triangle are:         // -red: 0.675, 0.322         // -green: 0.4091, 0.518         // -blue: 0.167, 0.04         double[] normalizedtoone = new double[3];         float cred, cgreen, cblue;         cred = c.getred();         cgreen = c.getgreen();         cblue = c.getblue();         normalizedtoone[0] = (cred / 255);         normalizedtoone[1] = (cgreen / 255);         normalizedtoone[2] = (cblue / 255);         float red, green, blue;          // make red more vivid         if (normalizedtoone[0] > 0.04045) {             red = (float) math.pow(                     (normalizedtoone[0] + 0.055) / (1.0 + 0.055), 2.4);         } else {             red = (float) (normalizedtoone[0] / 12.92);         }          // make green more vivid         if (normalizedtoone[1] > 0.04045) {             green = (float) math.pow((normalizedtoone[1] + 0.055)                     / (1.0 + 0.055), 2.4);         } else {             green = (float) (normalizedtoone[1] / 12.92);         }          // make blue more vivid         if (normalizedtoone[2] > 0.04045) {             blue = (float) math.pow((normalizedtoone[2] + 0.055)                     / (1.0 + 0.055), 2.4);         } else {             blue = (float) (normalizedtoone[2] / 12.92);         }          float x = (float) (red * 0.649926 + green * 0.103455 + blue * 0.197109);         float y = (float) (red * 0.234327 + green * 0.743075 + blue + 0.022598);         float z = (float) (red * 0.0000000 + green * 0.053077 + blue * 1.035763);          float x = x / (x + y + z);         float y = y / (x + y + z);          double[] xy = new double[2];         xy[0] = x;         xy[1] = y;         list<double> xyaslist = doubles.aslist(xy);         return xyaslist;     }

this not duplicate? please read referenced question understand. question convert xy. referenced question converting rgb hsb. how can same?!?!

found 1 little mistake:

float y = (float) (red * 0.234327 + green * 0.743075 + blue + 0.022598);

should be

float y = (float) (red * 0.234327 + green * 0.743075 + blue * 0.022598);

Comments

Post a Comment

Popular posts from this blog

user interface - How to replace the Python logo in a Tkinter-based Python GUI app? -

is there way change default logo, python logo , appears in window's task bar? notice have replaced default tk logo used appear in application window. i using windows 7 , python 2.6 , developing gui of tkinter. you can using winico tk extension package. winico package can used add system tray icons tk programs. the following sample shows 1 way change runtime application icon. note need provide .ico file suitable sizes of icons in on command line , need use pythonw. not change taskbar icon console when running python script. test extracted winico0.6 package python\tcl\winico0.6 folder package require winico work , ran code below using pythonw winico_test.py path\to\some\ico\file.ico . import sys tkinter import * def main(argv): root = tk() root.update() root.tk.call('package','require','winico') id = root.tk.call('winico','createfrom',argv[1]) root.tk.call('winico','setwindow',root,id...
Read more

objective c - Greedy NSProgressIndicator Allocation -

i'm using bunch of nsprogressindicators @ once (32 exact) , looks when they're animating start allocating memory no one's business greedy_run http://i62.tinypic.com/15rgmso.png i've got reports app slowdown , crash after days of uptime, , looks culprit, it's hard pinpoint bugs take days appear. i comment out call start animating, memory behaves expected. result of multiple nsprogressindicators alloc'ed on same thread? or maybe sandboxing? of constant allocations coming core animation threads, don't know else going on. custom nsview progress indicator lives in @interface myview () @property (nonatomic, strong) nsimageview *imageview; @property (nonatomic, strong) nstextview *numbertxt; @property (nonatomic, strong) nsprogressindicator *progress; @end @implementation myview - (id)initwithframe:(nsrect)framerect { self = [super initwithframe:framerect]; if (self) { // image nsimage *image = [nsimage imagenamed:@"bg.png"]; c...
Read more

how to set an OCR language in Google Drive -

i need upload image google drive including ocr feature. the problem setocrlanguage method. need specify hebrew language , based on iso 639-1 codes should "heb". i'm getting response "code" : 400, "errors" : [ { "domain" : "global", "location" : "ocrlanguage", "locationtype" : "parameter", "message" : "invalid value", "reason" : "invalid" } ], any idea should code or can list of avaliable codes?
Read more