rgb

问题 If one knows the "weights" of red, green, and blue, one can create a color using a class like .blaRGB { color: rgb(128, 128, 128) } .blaHSL { color: hsl(33%, 34%, 33%) } and use it in HTML like so: <p class="blaRGB">BLA RGB</p> <p class="blaHSL">BLA HSL</p> With the values shown above, blaRGB is dingy gray and blaHSL is white. But what if one wants to represent combinations of other colors, such as green, blue, orange, and gold? Is there a way to define such colors with a notation like the

问题 I use tesseract library for android to capture certain text from an image. I know that the captured image is not saved anywhere, it gets recycled. I need to find the original colored bitmap. I have been trying to locate the original colored bitmap, but all I could find was a grayscaled bitmap: Bitmap bitmap = activity.getCameraManager().buildLuminanceSource(data, width, height).renderCroppedGreyscaleBitmap(); When I save this bitmap to the sdcard, I get a gray scaled image.

问题 I am trying to extract the RGB components from an image and plot the 3D RGB histogrma using matplotlib. But I dont know how can I do it. Here's my current code: import cv2 import numpy as np from scipy import ndimage from matplotlib import pyplot as plt img_file = 'Paw03.png' img = cv2.imread(img_file, cv2.IMREAD_COLOR) # rgb #hsv_img = cv2.cvtColor(img,cv2.COLOR_BGR2HSV) # hsv rows, cols, ch = img.shape for x in range(rows): for y in range(cols): if (img[x, y, 1] == img[0, 255, 0]): break;

问题 How do I store a variable value in a rgb() ? I use this code which isn't working: <script> var R=200; var colval="rgb(R,10,100)"; </script> I want it to be like this: <script> var colval="rgb(200,10,100)"; </script> but somehow it doesn't store R right , putting quotes around 200 or R isn't working either. 回答1: I assume you're using JavaScript: <script> var R = 200; var colval = "rgb(" + R + ",10,100)"; </script> Results in colval = rgb(200,10,100) 来源： https://stackoverflow.com/questions

问题 I would like to be able to replicate the look of a primary color ('r','g' or 'b') in matplotlib with an alpha of 0.5 over a white background, while keeping the alpha at 1. Here is an example below, where through manual experimentation I've found the RGB values that with an alpha of 1, look similar to matplotlib default colors with an alpha 0.5. I was wondering if someone had an automated way of achieving this. import matplotlib.pyplot as plt s=1000 plt.xlim([4,8]) plt.ylim([0,10]) red=(1,0.55

问题 I want to plot m*n matrix, each element of which is an rgb triple, like in the following gnuplot code snippet (rgb matrix of 3*3 ): $cross << EODcross 255 0 0 0 0 0 255 0 0 0 0 0 0 0 0 0 0 0 255 0 0 0 0 0 255 0 0 EODcross Black cross on red background. I can change delimiters between columns and color components, if needed. Can I achieve the desired avoiding set palette rgbformulae i,j,k and directly using $cross data? Something like: plot '$cross' matrix with image rgb If not, I can pass

问题 The PHP imagecolorat() function can be used to get the RGB values of an image pixel, as demonstrated in the documentation: $im = imagecreatefrompng("php.png"); $rgb = imagecolorat($im, 10, 15); $r = ($rgb >> 16) & 0xFF; $g = ($rgb >> 8) & 0xFF; $b = $rgb & 0xFF; I don't understand the last three lines at all; I know that they return the correct values, but I cannot figure out how the >> and & operators work together to do so. Could someone please explain? For reference, when $rgb = 9750526 ,

问题 I have this simple code to go through a 24bit color windows bmp file BufferedImage mapa = BMPDecoder.read(new File("maps/map.bmp")); final int xmin = mapa.getMinX(); final int ymin = mapa.getMinY(); final int ymax = ymin + mapa.getHeight(); final int xmax = xmin + mapa.getWidth(); for (int i = xmin;i<xmax;i++) { for (int j = ymin;j<ymax;j++) { int pixel = mapa.getRGB(i, j); if (pixel == 0) { System.out.println("black at "+i+","+j); } } } However, when testing on a completely black image, I

问题 I'm trying to convert a RGB32 value to HSL because I want to use the Hue component. I have used some examples that I found online to create this class: public class HSLColor { public Double Hue; public Double Saturation; public Double Luminosity; public HSLColor(Double H, Double S, Double L) { Hue = H; Saturation = S; Luminosity = L; } public static HSLColor FromRGB(Color Clr) { return FromRGB(Clr.R, Clr.G, Clr.B); } public static HSLColor FromRGB(Byte R, Byte G, Byte B) { Double _R = (R /

问题 This will likely seem like a very easy thing I'm trying to do but Google search has not turned up exactly what I'm looking for and I'd like to do this correctly. Essentially I need to luminance match two bmps. They are simple circles (125x125 pixels) and their original color is only know to me by their (0-255 ranged) RGB value of 255,0,0. I need to find an RGB value of gray that is the same luminance of these circles. All other luminance/brightness matching tutorials I have seen have been for