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https://issues.apache.org/jira/browse/PDFBOX-2297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14115405#comment-14115405
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John Hewson commented on PDFBOX-2297:
-------------------------------------
Thanks but exposing implementation details such as the color spaces isn't
desirable, instead we should add a method to fetch the alternate images but
make the implementation decode the images on-the-fly.
> PDImageXObject: Add method getColorSpaces()
> -------------------------------------------
>
> Key: PDFBOX-2297
> URL: https://issues.apache.org/jira/browse/PDFBOX-2297
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Affects Versions: 2.0.0
> Reporter: Dominic Tubach
> Attachments: PDImageXObjectColorSpaces.patch
>
>
> PDImageXObject should contain the method getColorSpaces() to get the color
> spaces that were passed to the constructor. I need it for the following use
> case:
> An image XObject may contain alternate images in the Alternates dictionary
> entry. I want to create an PDImageXObject for one of the alternate images, so
> I need the color spaces to pass them to the constructor. Theoretically a
> method that returns a list of PDImageXObjects containing all alternate images
> would also be possible. But as long as a PDImageXObject is always decoded it
> would produce unnecessary overhead as I only need one of them.
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