rgb

问题 For example i have the following script. in this case i want to get the value of X1 and Y1 but the the exit() is not letting me to do so please help thanks in advance and special thanks to Mark Setchell :P (if he sees this) image link $im = imagecreatefromjpeg("omr.jpg"); for($x=0;$x<100;$x++) { for($y=0;$y<100;$y++) { $rgb = imagecolorat($im,$x,$y); $r = ($rgb >> 16) & 0xFF; $g = ($rgb >> 8) & 0xFF; $b = $rgb & 0xFF; if($r<128 && $g<128 && $b<128){ printf("%d,%d: %d,%d,%d\n",$x,$y,$r,$g,$b);

问题 I have a RGB image which has only black and white squares. I want to count number to non gray pixels in this image. I am new to matlab. I want to check the quality of image as it should only contain black and white pixels.Actually I have undistorted this image due that some colored fringes are appeared.I want to know the how many color are introduced to check the quality of the image. 回答1: using matlab to get counts of specific pixel values in an image. Images are RGBA <512x512x4 uint8> when

问题 I'm trying to read an Image type JPG/JPEG to BufferedImage , change RGB value of pixel (0,0) Image file : http://i.upanh.com/rcfutp but it didn't work correctly Here is what i've try Read image public BufferedImage readImage1(String path) { BufferedImage _image = null; BufferedImage copy = null; try { _image = ImageIO.read(new File(path)); copy = new BufferedImage(_image.getWidth(), _image.getHeight(), BufferedImage.TYPE_3BYTE_BGR); copy.getGraphics().drawImage(_image, 0, 0, null); } catch

问题 I have to read a 24bpp Bitmap and convert each pixel from RGB24 to ARGB16 . I used the following code, #define ARGB16(a, r, g, b) ( ((a) << 15) | (r)|((g)<<5)|((b)<<10)) But I am not getting the required Output. Any help would be highly appreciated. 回答1: Break it up. Let's continue to use macros: #define TRUNCATE(x) ((x) >> 3) #define ARGB16(a,r,g,b) ((a << 15) | (TRUNCATE(r) << 10) | (TRUNCATE(g) << 5) | TRUNCATE(b))) This assumes the alpha is just a single bit. 回答2: Since the RGB values are

问题 I have these lists containing blue values in RGB format. low = [ [0, 0, 128], [65, 105, 225], [70, 130, 180], [72, 61, 139], [83, 104, 120] ] What I want to make is this: convert all the values from, for example, first list from RGB to HSV. I made this code: import cv2 import numpy as np for v in low: rgb = np.uint8([[v]]) print("RGB: ", rgb) hsv = cv2.cvtColor(rgb, cv2.COLOR_RGB2HSV) print("HSV: ", hsv) print("\n") The problem is when I go to check if the colors (RGB-HSV) are the same. Here

问题 I like the random color generation algorithm proposed here by David Crow, but I wonder if there's a way to focus its results around a single color and regulate the results. My program will be generating graphs that track a number of variables. Each variable belongs to one of 7 categories. I'd like to generate line-colors for these variables that are legible, unique and for which the hue, saturation and luminosity are within a proximate range of a root color which is associated with their

问题 I am converting RGB to HSV using built in function of UIColour: - (BOOL)getHue:(CGFloat *)hue saturation:(CGFloat *)saturation brightness:(CGFloat *)brightness alpha:(CGFloat *)alpha but for some RGB it is not giving correct output. CGFloat h,s,v,a; UIColor *tColor=[UIColor colorWithRed:(230.0/255.0) green:(226.0/255.0) blue:(226.0/255.0) alpha:1.0]; BOOL success=[tColor getHue:&h saturation:&s brightness:&v alpha:&a]; NSLog(@"Output-> Success:%d, hue:%f, sat:%f, value:%f, alpha:%f",success,h

问题 I have user type the color (e.g. White, Red,...) so how can I get value of R, G, B with the color of user gave? I have a function (float r, float g, float b) to set color a node. So i let the user type the color name they want, then i want to convert that color name to get r, g, b value for my function. 回答1: Color defines a limited number of enums representing basic colours. This code excerpt uses reflection to map from their names to the RGB representations. Other than that you'll have to

问题 I'd like to implement something like the powerpoint image below. A gradient that goes between three values. It starts at A (-1) , the mid point is B (0) , and the end is C (1) . I have realised that I can save some effort by calculating the 'start' as a-to-b, and the 'end' as b-to-c. I can do as 2 sets of 2 gradients, instead of 1 gradient with three values. But I'm stumped (despite googling) on how to get from one colour to another - ideally in the RGB colour space. I'd like to be able to

问题 I have multiple original color values. I'm using a piece of software that only allows me to add hexadecimal hue values (such as hue:0x00ff00 or hue:0x000100 ) to these values in order to change their color. EDIT: I cannot directly type the final color I want. I can only control the hue (hexadecimal value), the saturation (value between -100 and 100), the lightness (value between -100 and 100) and the gamma (value between 0.01 and 10.0). How do I calculate the hue value I need for each