Is it possible to get the RGB value pixel under the mouse? Is there a complete example of this? Here's what I have so far:  <script> function draw() {   var ctx = document.getElementById('canvas').getContext('2d');   var i...
I'm trying to get a feel for some image manipulation in HTML5. I am finding that when I try and use the getImageData method I get this JS exception thrown. I am using Chrome and running on localhost.   Thanks!...
After setting a certain colour as the fillStyle of the canvas and drawing a rectangle with fillRect, the colour of the rectangle sometimes differs a bit from the one provided (the getImageData returns different values - usually one of them is lower b...
I'm trying to develop an application that will use getImageData in javascript in Firefox 3, but I am getting a "NS_ERROR_DOM_SECURITY_ERR" on the getImageData call. The javascript and the image are both currently being served from by hard...
I'm looking to allow users to slice an existing canvas into two canvases in whatever direction they would like.   I know how to allow the user to draw a line and I also know how to copy the image data of one canvas onto two new ones, but how can...
I have a two part question about javascript canvas:  Part 1: I have a .jpg in the same file as my html document. I was wondering if there was a simple way of getting a pixel's color in that file without having to use context.getImageData().    Pa...
Background Setup  I have a web application that deals with creating images from a set of other images. The way I've chosen to do that is by reading in a set of images and placing them on an HTML canvas. Then, I export each canvas as a jpeg to a t...
I've tearing my hair out!  I got this working, thought 'i can afford not to save a version of this', then i .. broke the 'build'.  The line myImageData = context.getImageData(0, 0, canvas.width, canvas.height); seems to breaking t...
I am doing a web application where i am pulling in an image from an IP camera, and I need to be able to see if there is a car in the parking spot. I wanted to do this using some sort of shape detection but all I can seem to find is face detection por...
I am working with the 'canvas' element, and trying to do some pixel based manipulations of images with Javascript in FIrefox 4.  The following code leaks memory, and i wondered if anyone could help identify what is leaking.  The images used a...

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