How to create an openCV image of a certain (R, G, B) color and get this color name?

Question

I need to create an image filled with some (R, G, B) color. And get a color name like some (R, G, B) = black or red, and so on. Can we do it with openCV and how to do it?

Answer 1

opencv does not create images with color, the easiest way is to fill in or just draw a filled rectangle with the selected color.
See https://docs.opencv.org/trunk/dc/da5/tutorial_py_drawing_functions.html

There is no function (AFAIK) to return the color name, the easiest way is to get a list of colors somewhere and check the RGB values ​​per pixel. If you need an immediate rather than exact match (rememebr no names for all 244-bit colors!) Look at the HSV color space

Answer 2

//In the header file add: class Color { public: static cv::Scalar ColorBlue; static cv::Scalar ColorRed; static cv::Scalar ColorGreen; static cv::Scalar ColorWhite; static cv::Scalar ColorBlack; }; //In the cpp file add: cv::Scalar Color::ColorBlue(255, 0, 0, 0); cv::Scalar Color::ColorRed(0, 255, 0, 0); cv::Scalar Color::ColorGreen(0, 0, 255, 0); cv::Scalar Color::ColorWhite(255, 255, 255, 0); cv::Scalar Color::ColorBlack(0, 0, 0, 0); 

Answer 3

A static color map class with static methods (both combined). Just copy and use.

 #pragma once #include <opencv/cv.hpp> #include <opencv/cv.h> class Color { public: static cv::Scalar aliceblue; static cv::Scalar antiquewhite; static cv::Scalar aqua; static cv::Scalar aquamarine; static cv::Scalar azure; static cv::Scalar beige; static cv::Scalar bisque; static cv::Scalar black; static cv::Scalar blanchedalmond; static cv::Scalar blue; static cv::Scalar blueviolet; static cv::Scalar brown; static cv::Scalar burlywood; static cv::Scalar cadetblue; static cv::Scalar chartreuse; static cv::Scalar chocolate; static cv::Scalar coral; static cv::Scalar cornflowerblue; static cv::Scalar cornsilk; static cv::Scalar crimson; static cv::Scalar cyan; static cv::Scalar darkblue; static cv::Scalar darkcyan; static cv::Scalar darkgoldenrod; static cv::Scalar darkgray; static cv::Scalar darkgreen; static cv::Scalar darkgrey; static cv::Scalar darkkhaki; static cv::Scalar darkmagenta; static cv::Scalar darkolivegreen; static cv::Scalar darkorange; static cv::Scalar darkorchid; static cv::Scalar darkred; static cv::Scalar darksalmon; static cv::Scalar darkseagreen; static cv::Scalar darkslateblue; static cv::Scalar darkslategray; static cv::Scalar darkslategrey; static cv::Scalar darkturquoise; static cv::Scalar darkviolet; static cv::Scalar deeppink; static cv::Scalar deepskyblue; static cv::Scalar dimgray; static cv::Scalar dimgrey; static cv::Scalar dodgerblue; static cv::Scalar firebrick; static cv::Scalar floralwhite; static cv::Scalar forestgreen; static cv::Scalar fuchsia; static cv::Scalar gainsboro; static cv::Scalar ghostwhite; static cv::Scalar gold; static cv::Scalar goldenrod; static cv::Scalar gray; static cv::Scalar green; static cv::Scalar greenyellow; static cv::Scalar grey; static cv::Scalar honeydew; static cv::Scalar hotpink; static cv::Scalar indianred; static cv::Scalar indigo; static cv::Scalar ivory; static cv::Scalar khaki; static cv::Scalar lavender; static cv::Scalar lavenderblush; static cv::Scalar lawngreen; static cv::Scalar lemonchiffon; static cv::Scalar lightblue; static cv::Scalar lightcoral; static cv::Scalar lightcyan; static cv::Scalar lightgoldenrodyellow; static cv::Scalar lightgray; static cv::Scalar lightgreen; static cv::Scalar lightgrey; static cv::Scalar lightpink; static cv::Scalar lightsalmon; static cv::Scalar lightseagreen; static cv::Scalar lightskyblue; static cv::Scalar lightslategray; static cv::Scalar lightslategrey; static cv::Scalar lightsteelblue; static cv::Scalar lightyellow; static cv::Scalar lime; static cv::Scalar limegreen; static cv::Scalar linen; static cv::Scalar magenta; static cv::Scalar maroon; static cv::Scalar mediumaquamarine; static cv::Scalar mediumblue; static cv::Scalar mediumorchid; static cv::Scalar mediumpurple; static cv::Scalar mediumseagreen; static cv::Scalar mediumslateblue; static cv::Scalar mediumspringgreen; static cv::Scalar mediumturquoise; static cv::Scalar mediumvioletred; static cv::Scalar midnightblue; static cv::Scalar mintcream; static cv::Scalar mistyrose; static cv::Scalar moccasin; static cv::Scalar navajowhite; static cv::Scalar navy; static cv::Scalar oldlace; static cv::Scalar olive; static cv::Scalar olivedrab; static cv::Scalar orange; static cv::Scalar orangered; static cv::Scalar orchid; static cv::Scalar palegoldenrod; static cv::Scalar palegreen; static cv::Scalar paleturquoise; static cv::Scalar palevioletred; static cv::Scalar papayawhip; static cv::Scalar peachpuff; static cv::Scalar peru; static cv::Scalar pink; static cv::Scalar plum; static cv::Scalar powderblue; static cv::Scalar purple; static cv::Scalar red; static cv::Scalar rosybrown; static cv::Scalar royalblue; static cv::Scalar saddlebrown; static cv::Scalar salmon; static cv::Scalar sandybrown; static cv::Scalar seagreen; static cv::Scalar seashell; static cv::Scalar sienna; static cv::Scalar silver; static cv::Scalar skyblue; static cv::Scalar slateblue; static cv::Scalar slategray; static cv::Scalar slategrey; static cv::Scalar snow; static cv::Scalar springgreen; static cv::Scalar steelblue; static cv::Scalar tan; static cv::Scalar teal; static cv::Scalar thistle; static cv::Scalar tomato; static cv::Scalar turquoise; static cv::Scalar violet; static cv::Scalar wheat; static cv::Scalar white; static cv::Scalar whitesmoke; static cv::Scalar yellow; static cv::Scalar yellowgreen; }; //In the cpp file add: cv::Scalar Color::aliceblue(255, 248, 240); cv::Scalar Color::antiquewhite(215, 235, 250); cv::Scalar Color::aqua(255, 255, 0); cv::Scalar Color::aquamarine(212, 255, 127); cv::Scalar Color::azure(255, 255, 240); cv::Scalar Color::beige(220, 245, 245); cv::Scalar Color::bisque(196, 228, 255); cv::Scalar Color::black(0, 0, 0); cv::Scalar Color::blanchedalmond(205, 235, 255); cv::Scalar Color::blue(255, 0, 0); cv::Scalar Color::blueviolet(226, 43, 138); cv::Scalar Color::brown(42, 42, 165); cv::Scalar Color::burlywood(135, 184, 222); cv::Scalar Color::cadetblue(160, 158, 95); cv::Scalar Color::chartreuse(0, 255, 127); cv::Scalar Color::chocolate(30, 105, 210); cv::Scalar Color::coral(80, 127, 255); cv::Scalar Color::cornflowerblue(237, 149, 100); cv::Scalar Color::cornsilk(220, 248, 255); cv::Scalar Color::crimson(60, 20, 220); cv::Scalar Color::cyan(255, 255, 0); cv::Scalar Color::darkblue(139, 0, 0); cv::Scalar Color::darkcyan(139, 139, 0); cv::Scalar Color::darkgoldenrod(11, 134, 184); cv::Scalar Color::darkgray(169, 169, 169); cv::Scalar Color::darkgreen(0, 100, 0); cv::Scalar Color::darkgrey(169, 169, 169); cv::Scalar Color::darkkhaki(107, 183, 189); cv::Scalar Color::darkmagenta(139, 0, 139); cv::Scalar Color::darkolivegreen(47, 107, 85); cv::Scalar Color::darkorange(0, 140, 255); cv::Scalar Color::darkorchid(204, 50, 153); cv::Scalar Color::darkred(0, 0, 139); cv::Scalar Color::darksalmon(122, 150, 233); cv::Scalar Color::darkseagreen(143, 188, 143); cv::Scalar Color::darkslateblue(139, 61, 72); cv::Scalar Color::darkslategray(79, 79, 47); cv::Scalar Color::darkslategrey(79, 79, 47); cv::Scalar Color::darkturquoise(209, 206, 0); cv::Scalar Color::darkviolet(211, 0, 148); cv::Scalar Color::deeppink(147, 20, 255); cv::Scalar Color::deepskyblue(255, 191, 0); cv::Scalar Color::dimgray(105, 105, 105); cv::Scalar Color::dimgrey(105, 105, 105); cv::Scalar Color::dodgerblue(255, 144, 30); cv::Scalar Color::firebrick(34, 34, 178); cv::Scalar Color::floralwhite(240, 250, 255); cv::Scalar Color::forestgreen(34, 139, 34); cv::Scalar Color::fuchsia(255, 0, 255); cv::Scalar Color::gainsboro(220, 220, 220); cv::Scalar Color::ghostwhite(255, 248, 248); cv::Scalar Color::gold(0, 215, 255); cv::Scalar Color::goldenrod(32, 165, 218); cv::Scalar Color::gray(128, 128, 128); cv::Scalar Color::green(0, 128, 0); cv::Scalar Color::greenyellow(47, 255, 173); cv::Scalar Color::grey(128, 128, 128); cv::Scalar Color::honeydew(240, 255, 240); cv::Scalar Color::hotpink(180, 105, 255); cv::Scalar Color::indianred(92, 92, 205); cv::Scalar Color::indigo(130, 0, 75); cv::Scalar Color::ivory(240, 255, 255); cv::Scalar Color::khaki(140, 230, 240); cv::Scalar Color::lavender(250, 230, 230); cv::Scalar Color::lavenderblush(245, 240, 255); cv::Scalar Color::lawngreen(0, 252, 124); cv::Scalar Color::lemonchiffon(205, 250, 255); cv::Scalar Color::lightblue(230, 216, 173); cv::Scalar Color::lightcoral(128, 128, 240); cv::Scalar Color::lightcyan(255, 255, 224); cv::Scalar Color::lightgoldenrodyellow(210, 250, 250); cv::Scalar Color::lightgray(211, 211, 211); cv::Scalar Color::lightgreen(144, 238, 144); cv::Scalar Color::lightgrey(211, 211, 211); cv::Scalar Color::lightpink(193, 182, 255); cv::Scalar Color::lightsalmon(122, 160, 255); cv::Scalar Color::lightseagreen(170, 178, 32); cv::Scalar Color::lightskyblue(250, 206, 135); cv::Scalar Color::lightslategray(153, 136, 119); cv::Scalar Color::lightslategrey(153, 136, 119); cv::Scalar Color::lightsteelblue(222, 196, 176); cv::Scalar Color::lightyellow(224, 255, 255); cv::Scalar Color::lime(0, 255, 0); cv::Scalar Color::limegreen(50, 205, 50); cv::Scalar Color::linen(230, 240, 250); cv::Scalar Color::magenta(255, 0, 255); cv::Scalar Color::maroon(0, 0, 128); cv::Scalar Color::mediumaquamarine(170, 205, 102); cv::Scalar Color::mediumblue(205, 0, 0); cv::Scalar Color::mediumorchid(211, 85, 186); cv::Scalar Color::mediumpurple(219, 112, 147); cv::Scalar Color::mediumseagreen(113, 179, 60); cv::Scalar Color::mediumslateblue(238, 104, 123); cv::Scalar Color::mediumspringgreen(154, 250, 0); cv::Scalar Color::mediumturquoise(204, 209, 72); cv::Scalar Color::mediumvioletred(133, 21, 199); cv::Scalar Color::midnightblue(112, 25, 25); cv::Scalar Color::mintcream(250, 255, 245); cv::Scalar Color::mistyrose(225, 228, 255); cv::Scalar Color::moccasin(181, 228, 255); cv::Scalar Color::navajowhite(173, 222, 255); cv::Scalar Color::navy(128, 0, 0); cv::Scalar Color::oldlace(230, 245, 253); cv::Scalar Color::olive(0, 128, 128); cv::Scalar Color::olivedrab(35, 142, 107); cv::Scalar Color::orange(0, 165, 255); cv::Scalar Color::orangered(0, 69, 255); cv::Scalar Color::orchid(214, 112, 218); cv::Scalar Color::palegoldenrod(170, 232, 238); cv::Scalar Color::palegreen(152, 251, 152); cv::Scalar Color::paleturquoise(238, 238, 175); cv::Scalar Color::palevioletred(147, 112, 219); cv::Scalar Color::papayawhip(213, 239, 255); cv::Scalar Color::peachpuff(185, 218, 255); cv::Scalar Color::peru(63, 133, 205); cv::Scalar Color::pink(203, 192, 255); cv::Scalar Color::plum(221, 160, 221); cv::Scalar Color::powderblue(230, 224, 176); cv::Scalar Color::purple(128, 0, 128); cv::Scalar Color::red(0, 0, 255); cv::Scalar Color::rosybrown(143, 143, 188); cv::Scalar Color::royalblue(225, 105, 65); cv::Scalar Color::saddlebrown(19, 69, 139); cv::Scalar Color::salmon(114, 128, 250); cv::Scalar Color::sandybrown(96, 164, 244); cv::Scalar Color::seagreen(87, 139, 46); cv::Scalar Color::seashell(238, 245, 255); cv::Scalar Color::sienna(45, 82, 160); cv::Scalar Color::silver(192, 192, 192); cv::Scalar Color::skyblue(235, 206, 135); cv::Scalar Color::slateblue(205, 90, 106); cv::Scalar Color::slategray(144, 128, 112); cv::Scalar Color::slategrey(144, 128, 112); cv::Scalar Color::snow(250, 250, 255); cv::Scalar Color::springgreen(127, 255, 0); cv::Scalar Color::steelblue(180, 130, 70); cv::Scalar Color::tan(140, 180, 210); cv::Scalar Color::teal(128, 128, 0); cv::Scalar Color::thistle(216, 191, 216); cv::Scalar Color::tomato(71, 99, 255); cv::Scalar Color::turquoise(208, 224, 64); cv::Scalar Color::violet(238, 130, 238); cv::Scalar Color::wheat(179, 222, 245); cv::Scalar Color::white(255, 255, 255); cv::Scalar Color::whitesmoke(245, 245, 245); cv::Scalar Color::yellow(0, 255, 255); cv::Scalar Color::yellowgreen(50, 205, 154); 

Answer 4

Here is the list of official css colors translated into OpenCV BGR Scalar:

Just put in colors.h and no longer worry about BGR - RGB - color-name translation.

 #define COLORS_aliceblue Scalar(255,248,240) #define COLORS_antiquewhite Scalar(215,235,250) #define COLORS_aqua Scalar(255,255,0) #define COLORS_aquamarine Scalar(212,255,127) #define COLORS_azure Scalar(255,255,240) #define COLORS_beige Scalar(220,245,245) #define COLORS_bisque Scalar(196,228,255) #define COLORS_black Scalar(0,0,0) #define COLORS_blanchedalmond Scalar(205,235,255) #define COLORS_blue Scalar(255,0,0) #define COLORS_blueviolet Scalar(226,43,138) #define COLORS_brown Scalar(42,42,165) #define COLORS_burlywood Scalar(135,184,222) #define COLORS_cadetblue Scalar(160,158,95) #define COLORS_chartreuse Scalar(0,255,127) #define COLORS_chocolate Scalar(30,105,210) #define COLORS_coral Scalar(80,127,255) #define COLORS_cornflowerblue Scalar(237,149,100) #define COLORS_cornsilk Scalar(220,248,255) #define COLORS_crimson Scalar(60,20,220) #define COLORS_cyan Scalar(255,255,0) #define COLORS_darkblue Scalar(139,0,0) #define COLORS_darkcyan Scalar(139,139,0) #define COLORS_darkgoldenrod Scalar(11,134,184) #define COLORS_darkgray Scalar(169,169,169) #define COLORS_darkgreen Scalar(0,100,0) #define COLORS_darkgrey Scalar(169,169,169) #define COLORS_darkkhaki Scalar(107,183,189) #define COLORS_darkmagenta Scalar(139,0,139) #define COLORS_darkolivegreen Scalar(47,107,85) #define COLORS_darkorange Scalar(0,140,255) #define COLORS_darkorchid Scalar(204,50,153) #define COLORS_darkred Scalar(0,0,139) #define COLORS_darksalmon Scalar(122,150,233) #define COLORS_darkseagreen Scalar(143,188,143) #define COLORS_darkslateblue Scalar(139,61,72) #define COLORS_darkslategray Scalar(79,79,47) #define COLORS_darkslategrey Scalar(79,79,47) #define COLORS_darkturquoise Scalar(209,206,0) #define COLORS_darkviolet Scalar(211,0,148) #define COLORS_deeppink Scalar(147,20,255) #define COLORS_deepskyblue Scalar(255,191,0) #define COLORS_dimgray Scalar(105,105,105) #define COLORS_dimgrey Scalar(105,105,105) #define COLORS_dodgerblue Scalar(255,144,30) #define COLORS_firebrick Scalar(34,34,178) #define COLORS_floralwhite Scalar(240,250,255) #define COLORS_forestgreen Scalar(34,139,34) #define COLORS_fuchsia Scalar(255,0,255) #define COLORS_gainsboro Scalar(220,220,220) #define COLORS_ghostwhite Scalar(255,248,248) #define COLORS_gold Scalar(0,215,255) #define COLORS_goldenrod Scalar(32,165,218) #define COLORS_gray Scalar(128,128,128) #define COLORS_green Scalar(0,128,0) #define COLORS_greenyellow Scalar(47,255,173) #define COLORS_grey Scalar(128,128,128) #define COLORS_honeydew Scalar(240,255,240) #define COLORS_hotpink Scalar(180,105,255) #define COLORS_indianred Scalar(92,92,205) #define COLORS_indigo Scalar(130,0,75) #define COLORS_ivory Scalar(240,255,255) #define COLORS_khaki Scalar(140,230,240) #define COLORS_lavender Scalar(250,230,230) #define COLORS_lavenderblush Scalar(245,240,255) #define COLORS_lawngreen Scalar(0,252,124) #define COLORS_lemonchiffon Scalar(205,250,255) #define COLORS_lightblue Scalar(230,216,173) #define COLORS_lightcoral Scalar(128,128,240) #define COLORS_lightcyan Scalar(255,255,224) #define COLORS_lightgoldenrodyellow Scalar(210,250,250) #define COLORS_lightgray Scalar(211,211,211) #define COLORS_lightgreen Scalar(144,238,144) #define COLORS_lightgrey Scalar(211,211,211) #define COLORS_lightpink Scalar(193,182,255) #define COLORS_lightsalmon Scalar(122,160,255) #define COLORS_lightseagreen Scalar(170,178,32) #define COLORS_lightskyblue Scalar(250,206,135) #define COLORS_lightslategray Scalar(153,136,119) #define COLORS_lightslategrey Scalar(153,136,119) #define COLORS_lightsteelblue Scalar(222,196,176) #define COLORS_lightyellow Scalar(224,255,255) #define COLORS_lime Scalar(0,255,0) #define COLORS_limegreen Scalar(50,205,50) #define COLORS_linen Scalar(230,240,250) #define COLORS_magenta Scalar(255,0,255) #define COLORS_maroon Scalar(0,0,128) #define COLORS_mediumaquamarine Scalar(170,205,102) #define COLORS_mediumblue Scalar(205,0,0) #define COLORS_mediumorchid Scalar(211,85,186) #define COLORS_mediumpurple Scalar(219,112,147) #define COLORS_mediumseagreen Scalar(113,179,60) #define COLORS_mediumslateblue Scalar(238,104,123) #define COLORS_mediumspringgreen Scalar(154,250,0) #define COLORS_mediumturquoise Scalar(204,209,72) #define COLORS_mediumvioletred Scalar(133,21,199) #define COLORS_midnightblue Scalar(112,25,25) #define COLORS_mintcream Scalar(250,255,245) #define COLORS_mistyrose Scalar(225,228,255) #define COLORS_moccasin Scalar(181,228,255) #define COLORS_navajowhite Scalar(173,222,255) #define COLORS_navy Scalar(128,0,0) #define COLORS_oldlace Scalar(230,245,253) #define COLORS_olive Scalar(0,128,128) #define COLORS_olivedrab Scalar(35,142,107) #define COLORS_orange Scalar(0,165,255) #define COLORS_orangered Scalar(0,69,255) #define COLORS_orchid Scalar(214,112,218) #define COLORS_palegoldenrod Scalar(170,232,238) #define COLORS_palegreen Scalar(152,251,152) #define COLORS_paleturquoise Scalar(238,238,175) #define COLORS_palevioletred Scalar(147,112,219) #define COLORS_papayawhip Scalar(213,239,255) #define COLORS_peachpuff Scalar(185,218,255) #define COLORS_peru Scalar(63,133,205) #define COLORS_pink Scalar(203,192,255) #define COLORS_plum Scalar(221,160,221) #define COLORS_powderblue Scalar(230,224,176) #define COLORS_purple Scalar(128,0,128) #define COLORS_red Scalar(0,0,255) #define COLORS_rosybrown Scalar(143,143,188) #define COLORS_royalblue Scalar(225,105,65) #define COLORS_saddlebrown Scalar(19,69,139) #define COLORS_salmon Scalar(114,128,250) #define COLORS_sandybrown Scalar(96,164,244) #define COLORS_seagreen Scalar(87,139,46) #define COLORS_seashell Scalar(238,245,255) #define COLORS_sienna Scalar(45,82,160) #define COLORS_silver Scalar(192,192,192) #define COLORS_skyblue Scalar(235,206,135) #define COLORS_slateblue Scalar(205,90,106) #define COLORS_slategray Scalar(144,128,112) #define COLORS_slategrey Scalar(144,128,112) #define COLORS_snow Scalar(250,250,255) #define COLORS_springgreen Scalar(127,255,0) #define COLORS_steelblue Scalar(180,130,70) #define COLORS_tan Scalar(140,180,210) #define COLORS_teal Scalar(128,128,0) #define COLORS_thistle Scalar(216,191,216) #define COLORS_tomato Scalar(71,99,255) #define COLORS_turquoise Scalar(208,224,64) #define COLORS_violet Scalar(238,130,238) #define COLORS_wheat Scalar(179,222,245) #define COLORS_white Scalar(255,255,255) #define COLORS_whitesmoke Scalar(245,245,245) #define COLORS_yellow Scalar(0,255,255) #define COLORS_yellowgreen Scalar(50,205,154)