But how could I set values (to erase) to a specific (not rectangular) 
region?
It would be like canvas:Clear() but with clipping.

victor

----- Original Message ----- 
From: "Antonio Scuri" <[email protected]>
To: "'IUP discussion list.'" <[email protected]>
Sent: Thursday, January 16, 2014 2:51 AM
Subject: Re: [Iup-users] teselation sample


>> The question would be: Can I fill with a transparent color to erase the
> image?
>
>   No you can't. When using CD the color will be combined with the color at
> the image using the transparency.
>
>   You have to set the color values using IM, for example using
> im.ProcessRenderConstant
>
> Best,
> Scuri
>
>
>
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