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https://issues.apache.org/jira/browse/WICKET-2192?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Igor Vaynberg updated WICKET-2192:
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    Attachment: ImageDocumentProcessor.java

attaching some code that shows how to extract image dimensions.

> Image should automatically set width and height attributes in markup
> --------------------------------------------------------------------
>
>                 Key: WICKET-2192
>                 URL: https://issues.apache.org/jira/browse/WICKET-2192
>             Project: Wicket
>          Issue Type: Improvement
>    Affects Versions: 1.4-RC2
>            Reporter: Esko Suomi
>            Priority: Minor
>         Attachments: ImageDocumentProcessor.java
>
>
> org.apache.wicket.markup.html.image.Image component (and all possible 
> derivates) should add width and height attributes of the image it represents 
> automatically to markup to allow for faster correct rendering of the actual 
> page. For example when rendering a table with images in table cells the table 
> cell width may vary a lot during loading of the page and its contents which 
> causes the table to jitter around while loading if image dimension attributes 
> aren't set.

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