Add cutom settings of canvas to function's input.

[Maximilan4]

Please, add custom settings of canvas (width,height). I need this stuff in last project, where img on html was bigger than original, canvas set width and height from original image. Now it works with help of bad things like this: $('.gen_plan').height(). It will be awesome, if you add some custom settings of canvas to functions's input.

P.S. sry for a bad english.