[FOP-2512] java.lang.NullPointerException: Parameter alpha must not be null

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0
• Assignee: Unassigned
• Reporter: Mathieu Malaterre
• Created: 16/Aug/15 13:04
• Updated: 27/Feb/19 00:26
• Resolved: 18/Dec/15 19:04

Description

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

Issue Links

• is related to: FOP-2847 [PATCH] Support palette-based transparency via tRNS chunk of PNG images in PDF export