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Subject: [OASIS Issue Tracker] (OFFICE-4049) text opacity property

    [ https://issues.oasis-open.org/browse/OFFICE-4049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=75661#comment-75661 ] 

Regina Henschel commented on OFFICE-4049:

In general I support such new property. But there are some details to be considered.

An additional alternative would be: Extend datatype 'color' to allow alpha channel, e.g by function rgba().


Currently draw:opacity modifies the filling of an object. For modifying other parts of objects, there exist the attributes
Depending on how the new property is intended to work (see below) an attribute name 'draw:text-opacity' might be more suitable.

In case the name would be 'draw:opacity' the existing texts have to be adapted, in case of a different name, e.g. 'draw:text-opacity', a new section is needed. Such text is missing in the proposal.

Additional questions:
How does fo:background-color interact with the semi-transparency of a character? Becomes only the character semi-transparent and you can see the background-color? Or becomes the complete area of the <text:span> element semi-transparent as a 'postprocess' as described for the new property 'opacity' in CSS3 https://www.w3.org/TR/css-color-3/#transparency ?

How does a filling of the object itself interact with the transparency of the character? Similar situation for images: If a png-image has a transparent part via alpha channel, you can see the background-color of the draw:frame element. With draw:opacity the background-color of the draw:frame element is effected, with draw:image-opacity the image is effected.

An additional question would be the interaction with attribute style:text-outline. But for that attribute, it is not specified, whether a color or value 'transparent' is used for the inner parts of the character.

Does animation with smil:attributeName="opacity" affects the new character transparency? Notice, that for 'color' it is explicitly said, that it effects text color, and there exists the value 'fillColor' if only the fill color is to be animated. 'opacity' has the vage term "elements's opacity".

> text opacity property
> ---------------------
>                 Key: OFFICE-4049
>                 URL: https://issues.oasis-open.org/browse/OFFICE-4049
>             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
>          Issue Type: New Feature
>            Reporter: Andras Timar
>            Priority: Major

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