rgb


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[]

How to convert RGB to HSL in C?

匆匆过客 提交于 2020-01-23 11:47:51
问题 How do I convert RGB to HSL in C/C++? (Note: This is a (short) self-answer -- I posted it here so people can find it quickly with a search.) 回答1: Translating the code from here, you get: // Assuming sizeof(unsigned int) == 4 * sizeof(unsigned char) unsigned int RgbToHsl(unsigned int rgb) // Alpha value is simply passed through { #ifdef __cplusplus using std::max; using std::min; #endif double r = (rgb >> (0 * CHAR_BIT)) & UCHAR_MAX, g = (rgb >> (1 * CHAR_BIT)) & UCHAR_MAX, b = (rgb >> (2 *

Calculating heat map colours

丶灬走出姿态 提交于 2020-01-22 20:55:46
问题 I'm working on a heat map made up of an HTML table. This table contains n cells and has a lowest value and a highest value (highest is always higher than lowest). Each cell has a cell value. All these values are ints. Cells with the lowest value are meant to be a light blue, scaling across to the point where the cells with the highest value are a deep red. See gradient below for an ideal range: To calculate the hex colour value of each individual cell, I look at the lowest and highest values

How to convert gray scale png image to RGB from comand line using image magick

浪子不回头ぞ 提交于 2020-01-22 16:05:17
问题 I am trying to convert an png Gray scale image to RGB png image using the following command. convert HopeLoveJoy.png -size 1x1 -fill "rgba(0%,1%,2%,0)" -draw "color 511,511 point" out_test.png By using the above the above command I am able to convert but the color of the image is getting changed. Is any thing wrong in the command?? Any help is appreciated. Thanks in advance. 回答1: If, as your question title implies, you really just want to go from greyscale to sRGB colorspace, use this:

How to convert gray scale png image to RGB from comand line using image magick

被刻印的时光 ゝ 提交于 2020-01-22 16:03:27
问题 I am trying to convert an png Gray scale image to RGB png image using the following command. convert HopeLoveJoy.png -size 1x1 -fill "rgba(0%,1%,2%,0)" -draw "color 511,511 point" out_test.png By using the above the above command I am able to convert but the color of the image is getting changed. Is any thing wrong in the command?? Any help is appreciated. Thanks in advance. 回答1: If, as your question title implies, you really just want to go from greyscale to sRGB colorspace, use this:

How to convert gray scale png image to RGB from comand line using image magick

时光毁灭记忆、已成空白 提交于 2020-01-22 16:03:07
问题 I am trying to convert an png Gray scale image to RGB png image using the following command. convert HopeLoveJoy.png -size 1x1 -fill "rgba(0%,1%,2%,0)" -draw "color 511,511 point" out_test.png By using the above the above command I am able to convert but the color of the image is getting changed. Is any thing wrong in the command?? Any help is appreciated. Thanks in advance. 回答1: If, as your question title implies, you really just want to go from greyscale to sRGB colorspace, use this:

ImageMagick Reduces Colorspace to Gray

纵然是瞬间 提交于 2020-01-21 03:11:32
问题 I convert RGB and CMYK TIFF images to RGB JPEGs using convert a.tif -colorspace rgb a.jpg If the TIFF image contains only gray pixels, the colorspace of the resulting JPEG is gray, not RGB. How can I force ImageMagick to always use RGB? 回答1: Try this: convert a.tif -colorspace rgb -type truecolor a.jpg However, I have to ask: How exactly do you determine your verdict 'colorspace of resulting JPEG is gray, not RGB' ?!? The ImageMagick tool identify can look at the colorspace used by files. If

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