rgb

C# convert RGB value to CMYK using an ICC profile?

由 ≯℡__Kan透↙ 提交于 2019-12-28 03:38:25
问题 this question seems posted at many places over the interwebs and SO, but I could not find a satisfactory answer :( How can I convert a RGB value to a CMYK value using an ICC profile? The closest answer I have is there, where it explains how to convert from CMYK to RGB but not the other way around, which is what I need. (http://stackoverflow.com/questions/4920482/cmyk-to-rgb-formula-of-photoshop/5076731#5076731) float[] colorValues = new float[4]; colorValues[0] = c / 255f; colorValues[1] = m

How to convert RGB from YUV420p for ffmpeg encoder?

由 寵の児 提交于 2019-12-28 01:55:21
问题 I want to make .avi video file from bitmap images by using c++ code. I wrote the following code: //Get RGB array data from bmp file uint8_t* rgb24Data = new uint8_t[3*imgWidth*imgHeight]; hBitmap = (HBITMAP) LoadImage( NULL, _T("myfile.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); GetDIBits(hdc, hBitmap, 0, imgHeight, rgb24Data , (BITMAPINFO*)&bmi, DIB_RGB_COLORS); /* Allocate the encoded raw picture. */ AVPicture dst_picture; avpicture_alloc(&dst_picture, AV_PIX_FMT_YUV420P, imgWidth,

Convert System.Drawing.Color to RGB and Hex Value

由 人走茶凉 提交于 2019-12-27 11:12:10
问题 Using C# I was trying to develop the following two. The way I am doing it may have some problem and need your kind advice. In addition, I dont know whether there is any existing method to do the same. private static String HexConverter(System.Drawing.Color c) { String rtn = String.Empty; try { rtn = "#" + c.R.ToString("X2") + c.G.ToString("X2") + c.B.ToString("X2"); } catch (Exception ex) { //doing nothing } return rtn; } private static String RGBConverter(System.Drawing.Color c) { String rtn

Convert System.Drawing.Color to RGB and Hex Value

由 情到浓时终转凉″ 提交于 2019-12-27 11:12:08
问题 Using C# I was trying to develop the following two. The way I am doing it may have some problem and need your kind advice. In addition, I dont know whether there is any existing method to do the same. private static String HexConverter(System.Drawing.Color c) { String rtn = String.Empty; try { rtn = "#" + c.R.ToString("X2") + c.G.ToString("X2") + c.B.ToString("X2"); } catch (Exception ex) { //doing nothing } return rtn; } private static String RGBConverter(System.Drawing.Color c) { String rtn

JS function to calculate complementary colour?

由 爷，独闯天下 提交于 2019-12-27 10:36:13
问题 Does anybody know, off the top of your heads, a Javascript solution for calculating the complementary colour of a hex value? There is a number of colour picking suites and palette generators on the web but I haven't seen any that calculate the colour live using JS. A detailed hint or a snippet would be very much appreciated. 回答1: Parsed through http://design.geckotribe.com/colorwheel/ // Complement temprgb={ r: 0, g: 0xff, b: 0xff }; // Cyan temphsv=RGB2HSV(temprgb); temphsv.hue=HueShift

colorsys模块颜色模型转换

由 ℡╲_俬逩灬. 提交于 2019-12-26 20:10:10
colorsys模块颜色模型转换 colorsys模块用于RGB和YIQ/HLS/HSV颜色模式的双向转换 colorsys.rgb_to_yiq(r, g, b) colorsys.rgb_to_hls(r, g, b) colorsys.rgb_to_hsv(r, g, b) colorsys.yiq_to_rgb(y, i, q) colorsys.hls_to_rgb(h, l, s) colorsys.hsv_to_rgb(h, s, v) 其中除了i，q之外的其他参数取值都是在[0, 1]范围内的浮点数。RGB参数需要除以255。 RGB RGB是一种相加色，根据红绿蓝三种光的相互叠加来显示不同的颜色，RGB三个字母分别代表红色Red、绿色Green和蓝色Blue。像素的颜色就是由这三个发光管的亮度决定的。 HSV HSV也就是HSB，分别代表色相Hue，饱和度Saturation和明度Value(Brightness)。 HLS HLS 也就是HSL，分别代表色相Hue，亮度Lightness和饱和度Saturation。 YIQ YIQ颜色模型使用亮度Luminance和色度Chrominance来表示颜色。用一组坐标来表示颜色的变化，Q表示了颜色色调由紫到绿的变化，I表示了颜色色调由橙到蓝的变化。 来源： CSDN 作者： kakak_ 链接： https:/

Java - Understanding about image.getRGB(x,y) output in Binary term

由 好久不见. 提交于 2019-12-25 08:46:12
问题 i use image.getRGB(x,y); and the result is : -16777216 When i convert -16777216 to binary term, i get result : 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 0000 0000 0000 0000 0000 0000 My question is, what the meaning for each binary above? (can you explain where is Red, Green, Blue, Alpha without using Color Class) Thanks for help. 回答1: You accidentally converted to 64 bit ( long ) instead of 32 bit ( int ). The correct binary representation is 1111 1111 0000 0000 0000 0000 0000 0000

How can I see the RGB channels of a given image with python?

由 旧街凉风 提交于 2019-12-25 08:14:02
问题 Imagine a I have an image and I want to split it and see the RGB channels. How can I do it using python? 回答1: My favorite approach is using scikit-image. It is built on top of numpy/scipy and images are internally stored within numpy-arrays. Your question is a bit vague, so it's hard to answer. I don't know exactly what you want to do but will show you some code. Test-image: I will use this test image. Code: import skimage.io as io import matplotlib.pyplot as plt # Read img = io.imread(

How can I see the RGB channels of a given image with python?

由 杀马特。学长 韩版系。学妹 提交于 2019-12-25 08:10:38
问题 Imagine a I have an image and I want to split it and see the RGB channels. How can I do it using python? 回答1: My favorite approach is using scikit-image. It is built on top of numpy/scipy and images are internally stored within numpy-arrays. Your question is a bit vague, so it's hard to answer. I don't know exactly what you want to do but will show you some code. Test-image: I will use this test image. Code: import skimage.io as io import matplotlib.pyplot as plt # Read img = io.imread(

opencv基础入门——色彩空间

由 江枫思渺然 提交于 2019-12-25 03:55:22
参考教程： python+opencv3.3视频教学 基础入门-bilibili 颜色空间 - 911的专栏 几种颜色模型介绍 - 简书 从 RGB 到 HSV 的转换详细介绍 - hanshanbuleng的博客 一、定义 色彩通常用三个相对独立的属性来描述，三个独立变量综合作用，自然就构成一个 空间坐标 ，这就是 色彩空间（色彩模型） 。 二、常见色彩空间 色彩可以由不同的角度，用三个一组的不同属性加以描述，就产生了不同的色彩空间。 最常见的几种色彩空间有： RGB 用于扫描仪和显示设备 、计算机系统 CMYK 用于打印机、印刷出版业 YUV/YIQ 用于视频和电视 HIS/HSB/HSV/HSL CIE 颜色空间，包括：CIE XYZ，CIE Lab，CIE YUV等颜色空间 1.RGB 一个能发出光波的物体称为有源物体，它的颜色由该物体发出的光波决定，使用R GB相加混合模型(additive color) 。 国际照明委员会（CIE）规定以 700nm(红)、546.1nm (绿)、435.8nm (蓝)三个色光为三基色 。又称为 物理三基色 。自然界的所有颜色都可以通过选用这三基色按不同比例混合而成。 计算机彩色显示器的输入需要RGB三个彩色分量，通过三个分量的不同比例，在显示屏幕上合成所需要的任意颜色。RGB颜色空间的三个分量又称为三个通道，R、G
订阅 rgb