They are identical. Use width: 0, because it is shorter and more readable. Especially when you have, for example: padding: 0px 0px 9px 8px vs padding: 0 0 9px 8px See the specs: The format of a length value (denoted by <length> in this specification) is a <number> (with or without a decimal point) immediately … Read more
In photoshop, the information pannel give you that. I’m pretty sure it’s also possible in Gimp. Or you can make your own tool ! I made you a small example in jsfiddle : http://jsfiddle.net/zz3Rh/19/ The html : <div id=”image”>image</div> coordinates : <div id=”coordinates”>0</div> The css : #image{ height:350px; background:#c00;} The js (with jquery loaded) : … Read more
Pixel-based conversion tracking is pretty straightforward. You set up a basic web server to accept HTTP GET requests and write logs for those requests. On the merchant’s confirmation page you put an image where the src attribute is a URL on your tracking server. That URL contains any data you need to collect for the … Read more
You could create your own ruler functionality and paste it into the console. Here’s a basic example: var fromX, fromY; var svg = document.createElementNS (‘http://www.w3.org/2000/svg’,”svg”); svg.setAttribute(“style”, “position: absolute; top:0;left:0;height: ” + document.body.clientHeight + “px;width: 100%”); var line = document.createElementNS(‘http://www.w3.org/2000/svg’,’line’); line.setAttribute(“style”, “stroke-width: 4; stroke: red”); svg.appendChild(line); document.body.appendChild(svg); document.body.addEventListener(“mousedown”, function (e) { fromX = e.pageX; fromY = … Read more
cv::Mat is preferred over IplImage because it simplifies your code cv::Mat img = cv::imread(“lenna.png”); for(int i=0; i<img.rows; i++) for(int j=0; j<img.cols; j++) // You can now access the pixel value with cv::Vec3b std::cout << img.at<cv::Vec3b>(i,j)[0] << ” ” << img.at<cv::Vec3b>(i,j)[1] << ” ” << img.at<cv::Vec3b>(i,j)[2] << std::endl; This assumes that you need to use the … Read more
Here is more efficient solution: // UIView+ColorOfPoint.h @interface UIView (ColorOfPoint) – (UIColor *) colorOfPoint:(CGPoint)point; @end // UIView+ColorOfPoint.m #import “UIView+ColorOfPoint.h” #import <QuartzCore/QuartzCore.h> @implementation UIView (ColorOfPoint) – (UIColor *) colorOfPoint:(CGPoint)point { unsigned char pixel[4] = {0}; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorSpace, kCGBitmapAlphaInfoMask & kCGImageAlphaPremultipliedLast); CGContextTranslateCTM(context, -point.x, -point.y); [self.layer renderInContext:context]; … Read more
Currently, you can expect the best rounding and sub-pixel support to come from Mozilla with IE as the runner up. IE might end up being more fine tuned, but their release cycles are so long that Mozilla is likely to stay ahead of them. As far as doing sub-pixel layout, you may be chasing a … Read more
This took quite a while to figure out, mainly because I wanted to get it up and running in Swift using Core Image and CIColorCube. @Miguel’s explanation is spot on about the way you need to replace a “Hue angle range” with another “Hue angle range”. You can read his post above for details on … Read more
The existing answers are now outdated. The getBoundingClientRect() method has been around for quite a while now, and does exactly what this question asks for. Plus it is supported across all browsers. From this MDN page: The returned value is a TextRectangle object, which contains read-only left, top, right and bottom properties describing the border-box, … Read more
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