rgb

Convert RGBA color to RGB

由 て烟熏妆下的殇ゞ 提交于 2019-12-17 02:59:16
问题 How to convert a RGBA color tuple, example (96, 96, 96, 202), to corresponding RGB color tuple? Edit: What I want is to get a RGB value which is most similar to the RGBA tuple visually on white background. 回答1: I've upvoted Johannes' answer because he's right about that. * A few comments have been raised that my original answer was not correct. It worked if alpha values were inverted from the normal. By definition, however, this won't work in most cases. I've therefore updated the formula

How to read the RGB value of a given pixel in Python?

由 三世轮回 提交于 2019-12-17 01:41:05
问题 If I open an image with open("image.jpg") , how can I get the RGB values of a pixel assuming I have the coordinates of the pixel? Then, how can I do the reverse of this? Starting with a blank graphic, 'write' a pixel with a certain RGB value? I would prefer if I didn't have to download any additional libraries. 回答1: It's probably best to use the Python Image Library to do this which I'm afraid is a separate download. The easiest way to do what you want is via the load() method on the Image

Latex 文本字体的颜色修饰

由 蓝咒 提交于 2019-12-17 00:33:32
一、color 方法 导入包 % 导言区添加 {color} 或 {xcolor} 中任意一个即可，也可以都导入 \usepackage{color} \usepackage{xcolor} 方法 1、color + 颜色名称 语法 {\color{颜色名称}要修改颜色的文本内容} 实例 {\color{red}红色} {\color{green}绿色} {\color{blue}蓝色} 效果 方法 2、color + rgb 语法 {\color[rgb]{红原色颜色值,绿原色颜色值,蓝原色颜色值}要修改颜色的文本内容} 注意：小写 rgb 情况时，需要注意三种原色在 0~1 之间取值 实例 {\color[rgb]{1,0,0}红色} {\color[rgb]{0,1,0}绿色} {\color[rgb]{0,0,1}蓝色} 效果 方法 3、color + RGB 语法 {\color[RGB]{红原色颜色值,绿原色颜色值,蓝原色颜色值}要修改颜色的文本内容} 注意：小写 RGB 情况时，需要注意三种原色的数值在 0~255 之间取值 实例 {\color[RGB]{255,0,0}红色} {\color[RGB]{0,255,0}绿色} {\color[RGB]{0,0,255}蓝色} 效果 二、textcolor 方法 导入包 % 导言区添加 {color} 或

rgb变为灰度图像

由 ╄→гoц情女王★ 提交于 2019-12-16 14:15:00
close all; clc; x = imread('C:\\timg.jpg'); %读取rgb图片信息 I = rgb2gray(x);%将rgb图像转化为灰度图像 set(0,'defaultFigurePosition',[100,100,1000,500]); %修改图像位置的默认设置 [距离左上角的宽，距离左上角的高，窗口宽，窗口高] set(0,'defaultFigureColor',[1 0 1]); %修改图形背景颜色的设置 [1 1 1]是白色 subplot(121),imshow(x); %显示原图像 121指一行两列第一个位置 subplot(122),imshow(I); 该程序可将一张照片灰度化，不可将灰度化照片保存到单独文件夹 来源： https://www.cnblogs.com/wjn1996/p/12028089.html

图像处理——BGR2HSV

由 不问归期 提交于 2019-12-15 01:21:36
图像处理——BGR2HSV 将BGR彩色转换为HSV彩色图像。 python代码： import cv2 import numpy as np def BGR2HSV ( _img ) : img = _img / 255.0 hsv_img = np . zeros_like ( img , dtype = np . float32 ) # get max and min max_v = np . max ( img , axis = 2 ) . copy ( ) min_v = np . min ( img , axis = 2 ) . copy ( ) min_arg = np . argmin ( img , axis = 2 ) # 最小值在数组中占的位置 # H hsv_img [ . . . , 0 ] [ np . where ( max_v == min_v ) ] = 0 ## min = B ind = np . where ( min_arg == 0 ) hsv_img [ . . . , 0 ] [ ind ] = 60 * ( img [ . . . , 1 ] [ ind ] - img [ . . . , 2 ] [ ind ] ) / ( max_v [ ind ] - min_v [ ind ] ) + 60 ## min = R ind =

Set background color to value of range input [closed]

由 你。 提交于 2019-12-14 03:35:36
问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . This is my code: <input id="red" name="red" type="range" min="0" max="255" step="1" value="128></input> <label for="red">red</label> <br> <input id="green" name="green" type="range" min="0" max="255" step="1"

RGB to Grayscale, bmp image in java

由 孤人 提交于 2019-12-14 01:24:37
问题 My teacher gave us a task to make a class that takes an 640x480 bmp colored image, to convert it in grayscale image, I found some sources with ideas so i did it. But there's a problem because it seems that it makes it cause it doesn't give me error, but the output doesn't appear. I think it's my code. My code is import java.io.*; public class Grayscale{ FileInputStream image; FileOutputStream img; byte[] datos; int gray; public Grayscale(String nombre)throws Exception{ this.image = new

Convert grayscale png to RGB png image

由 ↘锁芯ラ 提交于 2019-12-14 00:00:04
问题 I have a dataset of medical images in grayscale Png format which must be converted to RGB format. Tried many solutions but in vain. 回答1: If you want to just convert the format, the following method will help you: In python3, using PILLOW and Numpy: From PIL import Image import numpy as np im = Image.open(path/to/image, 'r').convert('L') im = np.stack((im,)*3, axis=-1) im = Image.fromarray(im) im.save(path/to/save) But if you want to colorize the image, know that colorization is an well-known

Convert hexidecimal colors to floats

由 你离开我真会死。 提交于 2019-12-13 21:24:11
问题 This may seem a bit silly, but I can't realize how I have to enter the desired color in glColor4f. I mean, it needs 4 floats between 0.0 ~ 1.0, and all the colors I find are in hexadecimal or in rgb (which are between 0 ~ 255). How do I have to make the conversion to adquire the desired color using glColor4f? I have already tried doing something like this: glColor4f(1/248, 1/50, 1/99); But it doesn't make the trick. I'm using JAVA and OpenGL-ES 回答1: 'C' does integer arithmatic in integers 1

Objective-C RGB to HSB

由 a 夏天 提交于 2019-12-13 20:27:30
问题 Let's say I've got the colour FF0000, which is red. Finding a darker colour is easy, I just type maybe CC instead of the FF, but let's say I've got the colour AE83FC, which is a complicated colour, how the heck would I find a lighter or darker version of it automatically? I figured the easy way to do this is to convert my RGB to HSB [Hue, Saturation, Brightness] How would I do that in Objective-C? Let's say I've got a RGB which is: 1.0, 0.0, 0.0. That's red. CGFloat r = 1.0; CGFloat g = 0.0;
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