RE: A CGM Question: handling transparency

["Benoit Bezaire" <Benoit.Bezaire@corel.com>]

Title: Message

Hi Franck,

 

Would this do it from an SVG perspective? 

 

Benoit.

 

-----Original Message-----
From: DULUC Franck [mailto:franck.duluc@airbus.com]
Sent: Thursday, August 28, 2003 4:56 AM
To: 'cgmopen members mailing list'
Subject: RE: A CGM Question: handling transparency

I do not remmember, is this something that is in the DOM CGMOpen is developping.

 

Regards,

-----Message d'origine-----
De : DULUC Franck
Envoyé : jeudi 28 août 2003 10:13
À : 'cgmopen mailing list'
Objet : RE: A CGM Question: handling transparency

Dear all,

 

    Thanks for all the replies I get.

 

    With the lights brought by your answers, I precise I was actually talking about background transparency, as I am looking at displaying the same graphics on black or white background.

 

    From the answers I get I understood that this is only available if the viewer/interpreter allows it when rendering; and this is not envisionned by CGM standard..

 

    For information, it appears also that SVG has not envisionned these features. It implements only the alpha transparency (equivalent to the Escape 45).

 

Any comments

 

Regards,

 

Franck

-----Message d'origine-----
De : DULUC Franck
Envoyé : mercredi 27 août 2003 12:10
À : 'cgmopen mailing list'
Objet : A CGM Question: handling transparency

Dear all,

        I would like to ask to you (users, vendros, CGM experts, ...) some help on understanding the transparency management proposed by CGM

        I I have well understood the standard:
                - The TRANSPARENCY primitive is used to decide wether the Colour specified by AUXILIARY COLOUR primitives with the following behavior:

                        - if TRANSPARENCY is set to off, all primitives (marker, filled area, text, pattern, ...) that needs to, use the AUXILIARY COLOUR for rendering for instance dash line.

                        - if TRANSPARENCY is set to on, all the things to be rendered in the AUXILIARY COLOUR are then rendered as TRANSPARENT (nothing drawn)

       
        Then, It seems to me that I have the mean to display some of my graphics with transparent (no colour) parts. But I have not found the way to have the background of my graphics rendered as transparent.

        Any help, comment, suggestion will be appreciated.

        Last but not least, what is the tool support level of such features?

Best Regards,

Franck DULUC
AIRBUS FRANCE
SDND - Digital Data Definition and Research
B.P. D0611
316, route de Bayonne
31060 TOULOUSE Cedex FRANCE
Phone: (33)5.61.18.19.16
Fax: (33)5.61.93.59.44
mailto:franck.duluc@airbus.com

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