Matthias Reischenbacher commented on FOP-2512:

Fixed in http://svn.apache.org/viewvc?view=revision&revision=1716758

It's interesting to see how much bug reports are out there in the web about 
this same issue:

My fix avoids to create an alpha raster, if the ColorModel implementation 
doesn't return one. This issue seems to affect only transparent PNGs with 
indexed color model. The alpha raster is used for the SMask entry in PDF. 
Transparency works in PDF even without SMask (any only with Mask) entry. Please 
let me know if there is anything wrong with my approach.

> 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
>         Attachments: 16x16.png, 19x13.png, 22x22.png
> 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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