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https://issues.apache.org/jira/browse/PDFBOX-1975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13932244#comment-13932244
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Tilman Hausherr edited comment on PDFBOX-1975 at 3/13/14 7:24 AM:
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I implemented setting the dpi for JPEG images, based on code in Apache XML
graphics (hi there!). This was done in rev. 1576867 and 1576868.
Sadly, it proves once more that java ImageIO doesn't have a general method to
set meta data.
was (Author: tilman):
I implemented setting the dpi for JPEG images, based on code in Apache XML
graphics (hi there!). And I added a test for that dpi. This was done in rev.
1576867 and 1576868.
Sadly, it proves once more that java ImageIO doesn't have a general method to
set meta data.
> Improve TestImageIOUtils unit tests to check image resolution and compression
> -----------------------------------------------------------------------------
>
> Key: PDFBOX-1975
> URL: https://issues.apache.org/jira/browse/PDFBOX-1975
> Project: PDFBox
> Issue Type: Task
> Components: Utilities
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Minor
> Labels: imageio, test, tiff
> Fix For: 2.0.0
>
>
> Because of the problems with recent changes (see PDFBOX-1963), I will improve
> the unit tests so that image resolution and compression is checked.
> I found out that JPEGs don't have a resolution, BMP had the wrong resolution.
> The fault wasn't in the java TIFF writer as I thought before, it is in the
> java PNG writer, which uses the PixelSize values wrongly, i.e. it interprets
> them as "pixels per mm" instead of "mm per pixel" as per specification. The
> JPEG writer throws an exception "JFIF APP0 must be first marker after SOI".
> The BMP writer can set the resolution, but the BMP reader doesn't read it.
> (Some of this might be different depending on the version)
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