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https://issues.apache.org/jira/browse/FOP-2512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14791728#comment-14791728
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Stefan Quandt commented on FOP-2512:
------------------------------------
Section 3.5.3.2.1 "PDF issue" of
https://jmodalwindow.java.net/manual/dpl/html_single/index.html
a) suggests that this is not a new issue and
b) offers a workaround by removing transparency with 'convert -layers flatten'
(ImageMagick)
Subsequently restoring transparency with 'convert -transparent #FFFFFF' also
works for me.
> java.lang.NullPointerException: Parameter alpha must not be null
> ----------------------------------------------------------------
>
> Key: FOP-2512
> URL: https://issues.apache.org/jira/browse/FOP-2512
> Project: FOP
> Issue Type: Bug
> Affects Versions: 2.0
> Reporter: Mathieu Malaterre
>
> fop is not capable of dealing with some PNG, it keeps on failing with:
> Error while rendering page 9
> java.lang.NullPointerException: Parameter alpha must not be null
> Exception
> java.lang.NullPointerException: Parameter alpha must not be null
> Input is:
> $ pnginfo test.png
> test.png...
> Image Width: 411 Image Length: 225
> Bitdepth (Bits/Sample): 8
> Channels (Samples/Pixel): 1
> Pixel depth (Pixel Depth): 8
> Colour Type (Photometric Interpretation): PALETTED COLOUR with alpha (18
> colours, 17 transparent)
> Image filter: Single row per byte filter
> Interlacing: No interlacing
> Compression Scheme: Deflate method 8, 32k window
> Resolution: 0, 0 (unit unknown)
> FillOrder: msb-to-lsb
> Byte Order: Network (Big Endian)
> Number of text strings: 0 of 0
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