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https://issues.apache.org/jira/browse/TIKA-1283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13983434#comment-13983434
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Hong-Thai Nguyen commented on TIKA-1283:
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+1 for me to create a thumbnail field in metadata Set.
- For OOXML, that's an item inside archive (see TIKA-1223). PowerPoint has
always embedded thumbnail in Jpeg, but optional with docx & xlsx (available
only when user check on 'save preview' option when saving document).
- For OLE Documents, see: http://poi.apache.org/hpsf/thumbnails.html. You can
get thumbnail content from POI API:
{code}
static byte[] process(File docFile) throws Exception {
final HWPFDocumentCore wordDocument = AbstractWordUtils.loadDoc(docFile);
SummaryInformation summaryInformation =
wordDocument.getSummaryInformation();
System.out.println(summaryInformation.getAuthor());
System.out.println(summaryInformation.getApplicationName() + ":" +
summaryInformation.getTitle());
Thumbnail thumbnail = new Thumbnail(summaryInformation.getThumbnail());
System.out.println(thumbnail.getClipboardFormat());
System.out.println(thumbnail.getClipboardFormatTag());
return thumbnail.getThumbnailAsWMF();
}
{code}
Unfortunately , there's an open bug on POI to get properly thumbnail content:
https://issues.apache.org/bugzilla/show_bug.cgi?id=56194
docx, xlsx & ole formats, they are WMF & EMF formats. Quite difficult to handle
these kind of images. But, this is out of our scope.
> Add "thumbnail" as possible metadata item to TikaCoreProperties
> ---------------------------------------------------------------
>
> Key: TIKA-1283
> URL: https://issues.apache.org/jira/browse/TIKA-1283
> Project: Tika
> Issue Type: Improvement
> Components: metadata
> Reporter: Tim Allison
> Priority: Minor
>
> TIKA-90 originally requested to add thumbnails to a document's metadata.
> I'd like to have a unified way of determining whether an embedded
> document/resource is a thumbnail or a regular attachment.
> With the changes in TIKA-1223 (ooxml) and TIKA-1010 (rtf), we are now pulling
> out more thumbnails than before.
> I propose adding "tika:thumbnail" to the metadata of each thumbnail image.
> The consumer can then determine what to do with the embedded resource based
> on the metadata.
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