rgb

How do you get random RGB in Javascript? [duplicate]

北城余情 提交于 2020-02-18 19:04:33
问题 This question already has answers here : Random color generator (52 answers) Closed 5 years ago . I have this code that uses RGB color selection and I was wondering how to make JavaScript do a random color using the RGB method and remember it throughout the code. EDIT: I tried this: var RGBColor1 = (Math.round, Math.random, 255) var RGBColor2 = (Math.round, Math.random, 255) var RGBColor3 = (Math.round, Math.random, 255) but it doesn't work. Help please! EDIT 2: The code uses this: g

Python 24.opencv 多对象模板匹配

泄露秘密 提交于 2020-02-09 18:03:26
import cv2 import numpy as np img_rgb = cv2.imread('mali.PNG') img_rgb_COPY = img_rgb img_gray = cv2.cvtColor(img_rgb, cv2.COLOR_BGR2GRAY) template = cv2.imread('kcoin.PNG', 0) w, h = template.shape[::-1] res = cv2.matchTemplate(img_gray, template, cv2.TM_CCOEFF_NORMED) threshold = 0.8 loc = np.where(res >= threshold) for pt in zip(*loc[::-1]): cv2.rectangle(img_rgb, pt, (pt[0] + w, pt[1] + h), (0, 0, 255), 2) res = np.hstack((img_rgb, img_rgb_COPY)) cv2.imshow('img', res) cv2.waitKey(0) cv2.destroyAllWindows() 来源: CSDN 作者: qq_36071362 链接: https://blog.csdn.net/qq_36071362/article/details

How can I convert an RGB input into a decimal color code?

一个人想着一个人 提交于 2020-02-05 07:07:25
问题 Say I have an rgb color code with values 255 for red, 255 for green and 0 for blue. How can I get the decimal color code from those numbers, using only mathematical operations? So my setup, in pseudo-code, would look like: int r = 255; int g = 255; int b = 0; int result = /*decimal color code for yellow*/ Please help, I have spent ages trying to find an answer already and would love a simple quick answer :) 回答1: int result = (r * 256 * 256) + (g * 256) + b Or, if your language has a bit shift

How can I convert an RGB input into a decimal color code?

不想你离开。 提交于 2020-02-05 07:07:24
问题 Say I have an rgb color code with values 255 for red, 255 for green and 0 for blue. How can I get the decimal color code from those numbers, using only mathematical operations? So my setup, in pseudo-code, would look like: int r = 255; int g = 255; int b = 0; int result = /*decimal color code for yellow*/ Please help, I have spent ages trying to find an answer already and would love a simple quick answer :) 回答1: int result = (r * 256 * 256) + (g * 256) + b Or, if your language has a bit shift

在OpenCV + Python中使用色彩空间进行图像分割

六眼飞鱼酱① 提交于 2020-02-04 02:33:50
在OpenCV + Python中使用色彩空间进行图像分割 什么是色彩空间? 在最常见的颜色空间RGB(红色绿色蓝色)中,颜色以红色,绿色和蓝色分量表示。用更专业的术语来说,RGB将颜色描述为三个组成部分的元组。每个分量可以取0到255之间的值,其中元组(0, 0, 0)代表黑色,(255, 255, 255)代表白色。 RGB被认为是三原色“加法”颜色空间,可以想象颜色是由大量红色,蓝色和绿色的光照射到黑色背景上产生的。 颜色 RGB值 红色 255,0,0 橙色 255,128,0 粉色 25,153,255 RGB是五个主要色彩空间模型之一,每个模型都有许多分支。颜色空间太多,因为不同的颜色空间可用于不同的目的。 在印刷领域,CMYK很有用,因为它描述了从白色背景产生颜色所需的颜色组合。RGB中的0元组是黑色,而CMYK中的0元组是白色。我们的打印机包含青色,品红色,黄色和黑色的墨水罐。 HSV和HSL是色相,饱和度和亮度/亮度的描述,对识别图像的对比度特别有用。这些色彩空间常用于软件的选色工具和网页设计中。 实际上,颜色是一种连续现象,意味着存在无限数量的颜色。但是,色彩空间通过离散结构(固定数量的整数整数值)表示颜色,这是可以接受的,因为人眼和感知也受到限制。颜色空间完全能够代表我们能够区分的所有颜色。 OpenCV中的色彩空间和读取图像 首先,您需要设置您的环境

Flex中生成颜色渐变值

六眼飞鱼酱① 提交于 2020-01-30 15:27:48
最近在项目中需要用到渐变色来表示一些数值,本来以为这种方法网上估计一搜一箩筐,后来却发现几乎没有解决这个问题的方法,不过最后功夫不负有心人,终于在javaEye中找到了关于在AS3下生成颜色渐变值的办法,下面我把代码贴出来,供大家学习使用,同时也感谢javaEye中的“蒙太奇”大哥,不多说了,以下是代码: package Library.Tools { public class ColorGradient { public function ColorGradient() { } /** * 输入一个颜色,将它拆成三个部分: * 红色,绿色和蓝色 */ public static function retrieveRGBComponent( color:uint ):Array { var r:Number = color >> 16; var g:Number = (color >> 8) & 0xff; var b:Number = color & 0xff; return [r, g, b]; } /** * 红色,绿色和蓝色三色组合 */ public static function generateFromRGBComponent( rgb:Array ):int { if( rgb == null || rgb.length != 3 || rgb[0] < 0 ||

RGB / XYZ and XYZ-LAB color space conversion algorithm

試著忘記壹切 提交于 2020-01-24 23:57:08
问题 I tried to convert RGB color space to CIE-LAB color space. But there is a mistake. input RGB values = (50,125,50) received result LAB vaues = (41,-38,34) LAB values should be (46.41,-39.24,33.51) I checked this values from http://colorizer.org/ Where did I make a mistake? If you check the following code and answer me. I will be glad. Thanks. public static Vector4 RGBToLab(Vector4 color) { float[] xyz = new float[3]; float[] lab = new float[3]; float[] rgb = new float[] { color[0], color[1],

OpenGL ES texture problem, 4 duplicate columns and horizontal lines (Android)

久未见 提交于 2020-01-24 19:35:09
问题 I have a buffer of RGB (or RGBA) texture image, and I want to display it on my Android device with the following code. I use OpenGL from NDK. glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, this->pBuffer); I have also set the PixelFormat from the Java side with: this.getHolder().setFormat(PixelFormat.RGBA_8888); this.setEGLConfigChooser(8, 8, 8, 8, 0, 0); setRenderer(new MyRenderer()); The image is displayed but there are four columns (identical and contains

Any faster algorithm to transform from RGB to CMYK

帅比萌擦擦* 提交于 2020-01-23 18:21:07
问题 This is how I am doing to convert from RGB to CMYK using the more "correct" way - i.e using an ICC color profile. // Convert RGB to CMYK with level shift (minus 128) private void RGB2CMYK(int[] rgb, float[][] C, float[][] M, float[][] Y, float[][] K, int imageWidth, int imageHeight) throws Exception { ColorSpace instance = new ICC_ColorSpace(ICC_Profile.getInstance(JPEGWriter.class.getResourceAsStream(pathToCMYKProfile))); float red, green, blue, cmyk[]; // for(int i = 0, index = 0; i <

how to decompose integer array to a byte array (pixel codings)

妖精的绣舞 提交于 2020-01-23 17:47:05
问题 Hi sorry for being annoying by rephrasing my question but I am just on the point of discovering my answer. I have an array of int composed of RGB values, I need to decompose that int array into a byte array, but it should be in BGR order. The array of int composed of RGB values is being created like so: pix[index++] = (255 << 24) | (red << 16) | blue; 回答1: C# code // convert integer array representing [argb] values to byte array representing [bgr] values private byte[] convertArray(int[]