Tilman Hausherr created PDFBOX-1975:
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Summary: 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
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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