I want set of totally distinct shades of QCOlor around 64

Qt Enthusiast · wrote on 28 Jul 2017, 11:18

If you the see the color pallete in
https://www.google.co.in/search?q=qcolordialog+color+palette&tbm=isch&imgil=_CijNvFuIaiO2M%253A%253B64sw8dEU0PjblM%253Bhttp%25253A%25252F%25252Fdoc.qt.io%25252Fqt-5%25252Fqcolordialog.html&source=iu&pf=m&fir=CijNvFuIaiO2M%253A%252C64sw8dEU0PjblM%252C&usg=__somCqlmBGeVEFzF6xDyE6ABPRUY%3D&biw=1522&bih=810&ved=0ahUKEwjH1aeb7KvVAhWCFJQKHVaPANYQyjcIQA&ei=ORx7WYfVFIKp0ATWnoKwDQ#imgrc=_CijNvFuIaiO2M:
then the colors are not distinct .

I want a distincy colors in this pallete

yuvaram · wrote on 28 Jul 2017, 11:29

@qtEnthusiast
Hi,
Do you want to use different shades of color. Then based on hex value of color, hex value can be set to QColor and can be used.
link text

Qt Enthusiast · 28 Jul 2017, 13:41

No I want a algorithm that gives me different set of colors very different something like this
https://stackoverflow.com/questions/2328339/how-to-generate-n-different-colors-for-any-natural-number-n

kshegunov · 28 Jul 2017, 14:43

Convert the rectangular RGB space into a spherical one and introduce a metric (if you want), then pick the colors from splitting the unit sphere into a number of parallels and meridians. At least that's what I'd do. The math isn't that complicated you can pull the formulas from wikipedia to try and wrap something up.

Qt Enthusiast · 29 Jul 2017, 07:10

@kshegunov

Is it possible to provide the code

Qt Enthusiast · wrote on 28 Jul 2017, 14:46

some pseudo code of rectangles will be done

kshegunov · wrote on 29 Jul 2017, 07:10

@Qt-Enthusiast said in I want set of totally distinct shades of QCOlor around 64:

@kshegunov

Is it possible to provide the code

Not really, I haven't any code, as I haven't done anything of that sort. It's only an idea you could explore.

mrjj · wrote on 29 Jul 2017, 10:15

Qt Enthusiast · 29 Jul 2017, 12:08

what algortimhs generates this

mrjj · wrote on 29 Jul 2017, 12:08

@Qt-Enthusiast
I think its a dictionary.
Make a small test program. there is also a table of hex values to use. ~~sample the color from the bitmap. (same offset so not so complex)~~
Then alter properties (QColor) to fine tune.
http://godsnotwheregodsnot.blogspot.dk/2013/11/kmeans-color-quantization-seeding.html
Kmeans++ Color Quantization seeding it seems :)
From
https://graphicdesign.stackexchange.com/questions/3682/where-can-i-find-a-large-palette-set-of-contrasting-colors-for-coloring-many-d

mrjj · wrote on 29 Jul 2017, 13:51

Hi
Using his table, and some ligher() and darker() calls then they seems pretty distinct ;)

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QPainter>

MainWindow::MainWindow(QWidget* parent) :
  QMainWindow(parent),
  ui(new Ui::MainWindow) {
  ui->setupUi(this);
}

MainWindow::~MainWindow() {
  delete ui;
}

const char* indexcolors[] = {
  "#000000", "#FFFF00", "#1CE6FF", "#FF34FF", "#FF4A46", "#008941", "#006FA6", "#A30059",
  "#FFDBE5", "#7A4900", "#0000A6", "#63FFAC", "#B79762", "#004D43", "#8FB0FF", "#997D87",
  "#5A0007", "#809693", "#FEFFE6", "#1B4400", "#4FC601", "#3B5DFF", "#4A3B53", "#FF2F80",
  "#61615A", "#BA0900", "#6B7900", "#00C2A0", "#FFAA92", "#FF90C9", "#B903AA", "#D16100",
  "#DDEFFF", "#000035", "#7B4F4B", "#A1C299", "#300018", "#0AA6D8", "#013349", "#00846F",
  "#372101", "#FFB500", "#C2FFED", "#A079BF", "#CC0744", "#C0B9B2", "#C2FF99", "#001E09",
  "#00489C", "#6F0062", "#0CBD66", "#EEC3FF", "#456D75", "#B77B68", "#7A87A1", "#788D66",
  "#885578", "#FAD09F", "#FF8A9A", "#D157A0", "#BEC459", "#456648", "#0086ED", "#886F4C",

  "#34362D", "#B4A8BD", "#00A6AA", "#452C2C", "#636375", "#A3C8C9", "#FF913F", "#938A81",
  "#575329", "#00FECF", "#B05B6F", "#8CD0FF", "#3B9700", "#04F757", "#C8A1A1", "#1E6E00",
  "#7900D7", "#A77500", "#6367A9", "#A05837", "#6B002C", "#772600", "#D790FF", "#9B9700",
  "#549E79", "#FFF69F", "#201625", "#72418F", "#BC23FF", "#99ADC0", "#3A2465", "#922329",
  "#5B4534", "#FDE8DC", "#404E55", "#0089A3", "#CB7E98", "#A4E804", "#324E72", "#6A3A4C",
  "#83AB58", "#001C1E", "#D1F7CE", "#004B28", "#C8D0F6", "#A3A489", "#806C66", "#222800",
  "#BF5650", "#E83000", "#66796D", "#DA007C", "#FF1A59", "#8ADBB4", "#1E0200", "#5B4E51",
  "#C895C5", "#320033", "#FF6832", "#66E1D3", "#CFCDAC", "#D0AC94", "#7ED379", "#012C58",

  "#7A7BFF", "#D68E01", "#353339", "#78AFA1", "#FEB2C6", "#75797C", "#837393", "#943A4D",
  "#B5F4FF", "#D2DCD5", "#9556BD", "#6A714A", "#001325", "#02525F", "#0AA3F7", "#E98176",
  "#DBD5DD", "#5EBCD1", "#3D4F44", "#7E6405", "#02684E", "#962B75", "#8D8546", "#9695C5",
  "#E773CE", "#D86A78", "#3E89BE", "#CA834E", "#518A87", "#5B113C", "#55813B", "#E704C4",
  "#00005F", "#A97399", "#4B8160", "#59738A", "#FF5DA7", "#F7C9BF", "#643127", "#513A01",
  "#6B94AA", "#51A058", "#A45B02", "#1D1702", "#E20027", "#E7AB63", "#4C6001", "#9C6966",
  "#64547B", "#97979E", "#006A66", "#391406", "#F4D749", "#0045D2", "#006C31", "#DDB6D0",
  "#7C6571", "#9FB2A4", "#00D891", "#15A08A", "#BC65E9", "#FFFFFE", "#C6DC99", "#203B3C",

  "#671190", "#6B3A64", "#F5E1FF", "#FFA0F2", "#CCAA35", "#374527", "#8BB400", "#797868",
  "#C6005A", "#3B000A", "#C86240", "#29607C", "#402334", "#7D5A44", "#CCB87C", "#B88183",
  "#AA5199", "#B5D6C3", "#A38469", "#9F94F0", "#A74571", "#B894A6", "#71BB8C", "#00B433",
  "#789EC9", "#6D80BA", "#953F00", "#5EFF03", "#E4FFFC", "#1BE177", "#BCB1E5", "#76912F",
  "#003109", "#0060CD", "#D20096", "#895563", "#29201D", "#5B3213", "#A76F42", "#89412E",
  "#1A3A2A", "#494B5A", "#A88C85", "#F4ABAA", "#A3F3AB", "#00C6C8", "#EA8B66", "#958A9F",
  "#BDC9D2", "#9FA064", "#BE4700", "#658188", "#83A485", "#453C23", "#47675D", "#3A3F00",
  "#061203", "#DFFB71", "#868E7E", "#98D058", "#6C8F7D", "#D7BFC2", "#3C3E6E", "#D83D66",

  "#2F5D9B", "#6C5E46", "#D25B88", "#5B656C", "#00B57F", "#545C46", "#866097", "#365D25",
  "#252F99", "#00CCFF", "#674E60", "#FC009C", "#92896B"
};


void MainWindow::on_pbGo_released() {
  const int tilesize = 32;
  const int mapsize = tilesize * 25 ;
  QPixmap pix(QSize(mapsize, mapsize));
  QPainter Painter;

  int maxCol = sizeof(indexcolors) / sizeof(indexcolors[0]);
  int cCol = 0;
  Painter.begin(&pix);

  Painter.setPen(QPen(QBrush(Qt::black), 1, Qt::SolidLine));
  int maxX = mapsize / tilesize;
  int dark = 0;

  for (int y = 0; y < maxX; ++y) {
    for (int x = 0; x < maxX; ++x) {
      QColor col(indexcolors[cCol]);
      if (cCol < maxCol) cCol++;
      else {
        cCol = 0;
        dark++;
      }

      if(dark == 1)
        col = col.darker();
      if(dark == 2)
        col = col.lighter();

      Painter.setBrush(QBrush(col) );
      Painter.drawRect((x * tilesize), (y * tilesize), tilesize, tilesize);
    }
  }   
  Painter.end();
 ui->labPic->setPixmap(pix);
}

Qt Enthusiast · 31 Jul 2017, 06:19

Can we generate the table with algorithm ?

mrjj · wrote on 31 Jul 2017, 06:19

@Qt-Enthusiast

Hi.
I thinks it s made using color distance algorithm already.
If you mean algorithm to generate all the colors out of nothing, then no.

Qt Enthusiast · 31 Jul 2017, 06:21

Algorithm means code

mrjj · wrote on 31 Jul 2017, 06:21

@Qt-Enthusiast

the colors are already code. ?

Qt Enthusiast · 31 Jul 2017, 06:24

Means a pseudo code that generates this table

mrjj · wrote on 31 Jul 2017, 06:24

@Qt-Enthusiast
Nope. Not that i have seen.