Re: MagickGetImageAttribute and a transparency question

On Mon, 21 Jan 2013, Manfred Rebentisch wrote:
>
> Ok, I am german and stupid in english: what means "matte"?
> But thank you for this tip too!

I am stupid in english too even though it is my native language.

The term comes from filmmaking.  See 
"http://en.wikipedia.org/wiki/Matte_%28filmmaking%29".

In GraphicsMagick, the Image structure has a 'matte' member boolean 
which indicates if the image can be non-opaque (support transparency). 
Even if the matte member is True, the image might still be opaque 
since it might not have any non-opaque pixels.

The core C API has the function GetImageCharacteristics() which can be 
used to obtain various image characteristics (such as if it is 
opaque).  If the 'optimize' argument to this function is True, then 
every pixel in the image will be inspected if necessary in order to 
ensure that the answer is as correct as possible (regardless of flags 
like 'matte').

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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