I have an image on a browser.  I want to get the top left pixel of the image color (at coordinates: 0,0), no matter whether the image is rotated or not.    How can I do that, using javascript or php code?...
I need to process pixeldata from a 1000x1000px *.bmp image (~1MiB) in javascript At the moment i am a bit stuck, because the page freezes when i try to dump the data to the console. the important code so far:    var img = new Image(); img.src = '...
In html5, when you draw to a canvas using putImageData(), if some of the pixels you are drawing are transparent (or semi-transparent), how do you keep old pixels in the canvas unaffected?  example:  var imgData = context.createImageData(30,30); for(v...
I'm animating a sprite on a pixel grid. I have a few options, with pros and cons for each. I have a fair amount of javascript experience (six years), but none with this kind of thing. The problem is I don't know how expensive each option will...
Is there a way to read transparent pixels from a picture using javascript?   I think, that it could be something similar to what PNG fixes does for IE (reading transparent pixels and applying some stuff, lol). But yes, for every browser..  Ah, would...
How do I merge a smaller image on top of a larger background image on one canvas. The smaller image will move around. So I will need to keep reference of the original background pixel data, so that the each frame the canvas can be redrawn, with the o...
I don't know how to make this algorithm in JavaScript/Node.js that converts bitmaps into svg paths pixel by pixel:     // input 0 0 0 0 0 0 0 0 0 0  0 0 0 0 0 0 0 0 0 0  0 0 1 1 1 1 1 1 0 0  0 0 1 1 1 1 1 1 0 0  0 1 1 1 0 0 1 1 1 0  0 1 1 1 0 0 1...
I am trying to write a greasemonkey javascript code for specifically my own page. In the page, there is an img with id "barcode".  I can use  var imageattributes = document.getElementById('barcode');   and get the image from the page....
I would like to create an image that consists of 128x128 pixles in two colors (e.g. orange and blue) using javascript. The pixels should be arranged randomly and I would like to be able to vary the proportion of the two colors (e.g. state sth like &#...
I have got a forum with the following HTML structure:  <div id="header">Contents</div> <div id="main">Contents</div> <div id="footer">Contents</div>   Basically, I need to set the height of...

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