rgb

php获取图片RGB颜色值的例子

落爺英雄遲暮 提交于 2020-02-29 09:01:45
php获取图片RGB颜色值的例子 很多图片站点都会根据用户上传的图片检索出图片的主要颜色值,然后在通过颜色搜索相关的图片。 之前按照网上的方法将图片缩放(或者马赛克)然后遍历每个像素点,然后统计处RGB次数最多的值,这做法效率太低而且取到的RGB值不够精确。之后才发现使用Imagick的quantizeImage方法能够很方便的取到图片中平均的RGB值. $average = new Imagick("xiaocai.jpg");$average->quantizeImage( 10, Imagick::COLORSPACE_RGB, 0, false, false );$average->uniqueImageColors();function GetImagesColor( Imagick $im ){$colorarr = array();$it = $im->getPixelIterator();$it->resetIterator();while( $row = $it->getNextIteratorRow() ){foreach ( $row as $pixel ){ // www.jbxue.com$colorarr[] = $pixel->getColor(); } }return $colorarr; }$colorarr = GetImagesColor(

color实用函数

前提是你 提交于 2020-02-29 03:39:50
1、十六进制颜色转换为rgb形式: /** * 十六进制颜色转换为rgb形式 * @function hex2rgb * @param {String} hex 颜色值(可省略前缀#) * @return {String} 如果hex长度大于7,直接返回hex;否则返回颜色值 * @example * // return rgb(0,0,0) * hex2rgb('#000000'); */ function hex2rgb(hex) { if ('#' === hex.charAt(0)) hex = hex.slice(1); var r, g, b, c = '#' === hex.charAt(0) ? hex.slice(1) : hex; if (c.length === 3) { r = c.charAt(0) + c.charAt(0); g = c.charAt(1) + c.charAt(1); b = c.charAt(2) + c.charAt(2); } else if (c.length === 6) { r = c.charAt(0) + c.charAt(1); g = c.charAt(2) + c.charAt(3); b = c.charAt(4) + c.charAt(5); } else { return hex; } return

calculate illuminance from Exif Data

*爱你&永不变心* 提交于 2020-02-27 07:36:37
问题 How I calculate the lux or illuminance by iPhone Camera.I have calculated all the exif data which is as: key = FocalLength, value = 3.85 key = MeteringMode, value = 5 key = ShutterSpeedValue, value = 4.591759434012097 key = ExposureProgram, value = 2 key = FocalLenIn35mmFilm, value = 32 key = SceneType, value = 1 key = FNumber, value = 2.4 key = PixelXDimension, value = 480 key = ExposureTime, value = 0.04166666666666666 key = BrightnessValue, value = -0.2005493394308445 key = ApertureValue,

calculate illuminance from Exif Data

白昼怎懂夜的黑 提交于 2020-02-27 07:36:03
问题 How I calculate the lux or illuminance by iPhone Camera.I have calculated all the exif data which is as: key = FocalLength, value = 3.85 key = MeteringMode, value = 5 key = ShutterSpeedValue, value = 4.591759434012097 key = ExposureProgram, value = 2 key = FocalLenIn35mmFilm, value = 32 key = SceneType, value = 1 key = FNumber, value = 2.4 key = PixelXDimension, value = 480 key = ExposureTime, value = 0.04166666666666666 key = BrightnessValue, value = -0.2005493394308445 key = ApertureValue,

16进制颜色与RGB颜色

梦想与她 提交于 2020-02-26 22:59:13
参考: http://tianle.name/wlyy/275 网页中表示颜色的常见方法有: 1.Color Name(颜色名称) 用颜色名称来指定颜色,这种方法简洁直观,一看就知道是什么颜色,但最大的缺点是颜色的名称太少,不能有效的表示一些较丰富的颜色 2.RGB(RGB记法) 3.HEX(十六进制记法) RGB记法和十六进制记法都能很好的表示出一些较为丰富的颜色,但是我们用到16进制的比较多,语法为#RRGGBB,下面说下我刚研究出来的转换方法: 我们都知道 RGB记法rgb(255,255,255)=十六进制记法#FFFFFF,都表示白色 RGB记法rgb(0,0,0)=十六进制记法#000000,都表示黑色 那么RGB记法rgb(100,150,245)=十六进制记法#?????? RGB的取值都是0~255,HEX的取值为0123456789ABCDEF这16个字符,下面看看RGB-HEX对照表: RGB HEX 0 00 1 01 2 02 3 03 4 04 5 05 6 06 7 07 8 08 9 09 10 0A 11 0B 12 0C 13 0D 14 0E 15 0F 16 10 17 11 18 12 19 13 20 14 21 15 22 16 23 17 24 18 25 19 26 1A 27 1B 28 1C 29 1D 30 1E 31 1F

OpenGL Convert NV12 to RGB24 using shader [closed]

こ雲淡風輕ζ 提交于 2020-02-25 01:24:19
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 days ago . I tried to write an application to display YUV image in OpenGL. I was successfully converted YUV to RGB in C++ using this snippet (source) static long int crv_tab[256]; static long int cbu_tab[256]; static long int cgu_tab[256]; static long int cgv_tab[256]; static long int tab_76309[256]; static unsigned char

OpenGL Convert NV12 to RGB24 using shader [closed]

对着背影说爱祢 提交于 2020-02-25 01:23:08
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 days ago . I tried to write an application to display YUV image in OpenGL. I was successfully converted YUV to RGB in C++ using this snippet (source) static long int crv_tab[256]; static long int cbu_tab[256]; static long int cgu_tab[256]; static long int cgv_tab[256]; static long int tab_76309[256]; static unsigned char

Generate n colors between two colors

你离开我真会死。 提交于 2020-02-21 13:05:11
问题 I'm trying to write function, which can generate colors between two colors based on a given value. An example would explain it better.. Input .. X : 1 Y : 0.5 Z : 0 The user gives any set of color:value pairs, then enters a number(say 0.75). I have to then generate color which is a blend of Y and Z in proportion(based on the their values and the input value). I was thinking of the following approach. Find the colors which surround the value, for 0.75 it will be 0.5 and 1. Mix those two colors

Generate n colors between two colors

不羁的心 提交于 2020-02-21 13:04:00
问题 I'm trying to write function, which can generate colors between two colors based on a given value. An example would explain it better.. Input .. X : 1 Y : 0.5 Z : 0 The user gives any set of color:value pairs, then enters a number(say 0.75). I have to then generate color which is a blend of Y and Z in proportion(based on the their values and the input value). I was thinking of the following approach. Find the colors which surround the value, for 0.75 it will be 0.5 and 1. Mix those two colors

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

↘锁芯ラ 提交于 2020-02-18 19:08:40
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