detecting pixel dimension of a jpg

[Bignewbie]

hey ppl!


could anyone tell me how to detect the actual pixel dimensions of a jpeg image? not the byte size, the pixel dimensions ?

thanks



bignewbie

 

[grega]

The way I do it is if the image is defined as an Image object in Javascript, you can just use the height & width properties.

var myImg=new Image();
myImg.src="images/myimage.jpg";
// this line waits for the image to finish loading so we
// can get the height & width properties
while (!myImg.complete) {}

var iWidth=myImg.width;
var iHeight=myImg.height;

This works for me on IE. I'm no expert so there may be simpler ways.

Greg.