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https://issues.apache.org/jira/browse/PDFBOX-1975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13932943#comment-13932943
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Tilman Hausherr commented on PDFBOX-1975:
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The cause for the unreliable BMP behavior was that there are two drivers. One
is meta-readonly, the other isn't. I changed the code so that it will remember
a driver that is meta-readonly, but that it will keep searching for a better
one. This was one in rev 1577045.
I changed the test code for WBMP that it creates a bitonal image, because WBMP
is a bitonal format. I added code for BMP and JPEG that it checks the
resolution. This was done in rev 1577046.
More to come...
> 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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