Hi, 

I was reading the spec part about ImageData [1].

1) 
I noticed that createImageData() is explicit that it represent a transparent 
black rectangle. The constructor for ImageData is not that explicit.

2)
The last step of the 2nd constructor that takes an Uint8ClampedArray says:
"       • Return a new ImageData object whose width is sw, whose height is 
height, and whose data is source.”

Is data a reference to the original source or a copy of source? For the former, 
there might be two ImageData objects referencing the same ByteArray. How would 
that be useful?

Greetings,
Dirk

[1] 
http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#dfnReturnLink-7
 (4.12.4.2.16 Pixel manipulation)

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