Pixel to MM equation?
What i did : <div id=”my_mm” style=”height:100mm;display:none”></div> Then: var pxTomm = function(px){ return Math.floor(px/($(‘#my_mm’).height()/100)); //JQuery returns sizes in PX };
pixel
How to draw a pixel on the screen directly?
Direct answer: This can only be done with OS-specific APIs. Some OSes do not allow changing pixels on the screen directly. On Windows, you can use pywin32 libraries to get screen’s device context with dc = GetDC(0) call, then paint pixels with SetPixel(dc, x, y, color). import win32gui import win32api dc = win32gui.GetDC(0) red = … Read more
How to draw a pixel on the screen directly?
Direct answer: This can only be done with OS-specific APIs. Some OSes do not allow changing pixels on the screen directly. On Windows, you can use pywin32 libraries to get screen’s device context with dc = GetDC(0) call, then paint pixels with SetPixel(dc, x, y, color). import win32gui import win32api dc = win32gui.GetDC(0) red = … Read more
Get color of each pixel of an image using BufferedImages
import java.io.*; import java.awt.*; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; public class GetPixelColor { public static void main(String args[]) throws IOException { File file = new File(“your_file.jpg”); BufferedImage image = ImageIO.read(file); // Getting pixel color by position x and y int clr = image.getRGB(x, y); int red = (clr & 0x00ff0000) >> 16; int green = (clr … Read more
Pixel to Centimeter?
Similar to this question which asks about points instead of centimeters. There are 72 points per inch and there are 2.54 centimeters per inch, so just substitute 2.54 for 72 in the answer to that question. I’ll quote and correct my answer here: There are 2.54 centimeters per inch; if it is sufficient to assume … Read more
Edit raw pixel data of WriteableBitmap?
To answer your question, you can more directly access a writable bitmap’s data by using the Lock, write, Unlock pattern, as demonstrated below, but it is typically not necessary unless you are basing your drawing upon the contents of the image. More typically, you can just create a new buffer and make it a bitmap, … Read more
Pixel access in OpenCV 2.2
In opencv 2.2, I’d use the C++ interface. cv::Mat in = /* your image goes here, assuming single-channel image with 8bits per pixel */ for(int row = 0; row < in.rows; ++row) { unsigned char* inp = in.ptr<unsigned char>(row); for (int col = 0; col < in.cols; ++col) { if (*inp++ == 0) { std::cout … Read more
Developing a tracking pixel
You can write a script that creates and returns a .gif, .jpeg or .png image using PHP for tracking purposes using the GD library (which is often distributed with PHP in modern versions). If you don’t have access to GD, you can always recompile PHP with GD enabled. Example: pixel.php (commented for the purposes of … Read more
What are pixels and points in iOS?
A pixel on iOS is the full resolution of the device, which means if I have an image that is 100×100 pixels in length, then the phone will render it 100×100 pixels on a standard non-retina device. However, because newer iPhones have a quadrupled pixel density, that same image will render at 100×100 pixels, but … Read more
How to get the pixel color on touch?
This is the one I’ve used, and it looks simpler than the methods you’ve tried. In my custom view class, I have this: – (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [[event allTouches] anyObject]; CGPoint loc = [touch locationInView:self]; self.pickedColor = [self colorOfPoint:loc]; } colorOfPoint is a method in a category on UIView, with … Read more