pixel

问题 I need python to change the color of one individual pixel on a picture, how do I go about that? 回答1: To build upon the example given in Gabi Purcaru's link, here's something cobbled together from the PIL docs. The simplest way to reliably modify a single pixel using PIL would be: x, y = 10, 25 shade = 20 from PIL import Image im = Image.open("foo.png") pix = im.load() if im.mode == '1': value = int(shade >= 127) # Black-and-white (1-bit) elif im.mode == 'L': value = shade # Grayscale

问题 I have to create a simple 2D animation without using various primitives for drawing line, circle etc for the purpose. It has to be done by manipulating pixels and implementing one of the algorithms for drawing line, circle etc by coloring pixels. I thought of using Turbo C for the purpose, but I use ubuntu. So I tried using dosbox to install and run turbo C but to no avail. Now my only option is Java. Is it possible to manipulate pixels in Java? I couldn't find myself any good tutorials for

问题 I am trying to create a color picker cocoa app in objective-c so I can get the color of any pixel on my screen. Is there a way to get the color a certain screen pixel in objective-c? 回答1: You can use CGDisplayCreateImageForRect to get a CGImageRef that encompasses the point you're interested in. Once you have a CGImage, you can get a color value out of it by rendering the image into custom buffer, or by using NSBitmapImageRep's initWithCGImage and then colorAtX:y:. The "written in stack

问题 Can anyone help me on how to get the RGB pixel data from an image in R? I need this information to compare differences in bird plumage to aid in the understanding of a speciation event. My photos are taken by a digital camera and are now as a NEF-file. It doesn't matter which type of file that's needed, I have the possibility to convert the file to whatever I want. However, I would prefer to maintain as much information as possible in the file (i. e. PNG-files are good). I have tried many

问题 I want to get the color of the spot or pixel where I will touch a image in Android. I searched a lot on net, but got nothing. Please anyone help me. 回答1: try this: final Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap(); imageView.setOnTouchListener(new OnTouchListener(){ @Override public boolean onTouch(View v, MotionEvent event){ int x = (int)event.getX(); int y = (int)event.getY(); int pixel = bitmap.getPixel(x,y); //then do what you want with the pixel data, e.g int

问题 I am trying to get every single color of every single pixel of an image. My idea was following: int[] pixels; BufferedImage image; image = ImageIO.read(this.getClass.getResources("image.png"); int[] pixels = ((DataBufferInt)image.getRaster().getDataBuffer()).getData(); Is that right? I can't even check what the "pixels" array contains, because i get following error: java.awt.image.DataBufferByte cannot be cast to java.awt.image.DataBufferInt I just would like to receive the color of every

问题 from UIImage reference, size The dimensions of the image, taking orientation into account. (read-only) @property(nonatomic, readonly) CGSize size Discussion In iOS 4.0 and later, this value reflects the logical size of the image and is measured in points. In iOS 3.x and earlier, this value always reflects the dimensions of the image measured in pixels. What's the difference between pixel and points? 回答1: A pixel on iOS is the full resolution of the device, which means if I have an image that

问题 I am trying to build a pixel that would track the current URL the user is on when they visit. I can use either JS (preferred) or a 1x1 image pixel. With JS I am assuming that I'd need to run an AJAX request to a PHP script to capture the info that I need and with an image pixel I am having issues getting the currently URL. I also thought about URL encoding the current URL with JS and dynamically placing the image pixel with the encoded current URL as a query string to a PHP script, but that I

问题 I would like to make a game that is internally 320x240, but renders to the screen at whole number multiples of this (640x480, 960,720, etc). I am going for retro 2D pixel graphics. I have achieved this by setting the internal resolution via glOrtho(): glOrtho(0, 320, 240, 0, 0, 1); And then I scale up the output resolution by a factor of 3, like this: glViewport(0,0,960,720); window = SDL_CreateWindow("Title", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 960, 720, SDL_WINDOW_OPENGL); I

问题 Is it possible to get the RGB color of a pixel using PIL? I'm using this code: im = Image.open("image.gif") pix = im.load() print(pix[1,1]) However, it only outputs a number (e.g. 0 or 1 ) and not three numbers (e.g. 60,60,60 for R,G,B). I guess I'm not understanding something about the function. I'd love some explanation. Thanks a lot. 回答1: Yes, this way: im = Image.open('image.gif') rgb_im = im.convert('RGB') r, g, b = rgb_im.getpixel((1, 1)) print(r, g, b) (65, 100, 137) The reason you