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[Pnet-developers] [bugs #10445] Exception in PNG Reading loading an imag
From: |
Gopal.V |
Subject: |
[Pnet-developers] [bugs #10445] Exception in PNG Reading loading an image |
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This mail is an automated notification from the bugs tracker
of the project: DotGNU Portable.NET.
/**************************************************************************/
[bugs #10445] Latest Modifications:
Changes by:
Gopal.V <address@hidden>
'Date:
Wed 10/06/2004 at 13:48 (Asia/Calcutta)
What | Removed | Added
---------------------------------------------------------------------------
Resolution | None | Fixed
Status | Open | Closed
------------------ Additional Follow-up Comments ----------------------------
Fixed in CVS on 6th Oct 2004.
Png specs are waaay toooo vague - wasted half my day.
/**************************************************************************/
[bugs #10445] Full Item Snapshot:
URL: <http://savannah.gnu.org/bugs/?func=detailitem&item_id=10445>
Project: DotGNU Portable.NET
Submitted by: Heiko Weiss
On: Mon 09/20/2004 at 09:11
Category: None
Severity: 5 - Average
Item Group: None
Resolution: Fixed
Privacy: Public
Assigned to: None
Status: Closed
Summary: Exception in PNG Reading loading an image
Original Submission: In some cases the png reader throws an exception
System.FormatException: invalid filter type byte f
or scanline 0: 255
while loading an image.
Example with images atached.
Image1.png works well. Image2.png throws the exception.
Follow-up Comments
------------------
-------------------------------------------------------
Date: Wed 10/06/2004 at 13:48 By: Gopal.V <t3rmin4t0r>
Fixed in CVS on 6th Oct 2004.
Png specs are waaay toooo vague - wasted half my day.
-------------------------------------------------------
Date: Sun 09/26/2004 at 02:53 By: Deryk Robosson <drobosson>
I believe this may be related to the Adam7 Interlacing some how. PNG files
without, do not appear to have this exception thrown. However the test image2
provided in the archive below spits out a 255 value on exception and my test
image from GIMP a 170 value. Both of these numbers would be correct to have
the exception thrown per the PNG specs as there are only 5 filter values, 0-4
File info for the one that is throwing the exception is:
Image Width: 54 Image Length: 52
Bitdepth (Bits/Sample): 8
Channels (Samples/Pixel): 4
Pixel depth (Pixel Depth): 32
Colour Type (Photometric Interpretation): RGB with alpha channel
Image filter: Single row per byte filter
Interlacing: Adam7 interlacing
Compression Scheme: Deflate method 8, 32k window
Resolution: 2834, 2834 (pixels per meter)
FillOrder: msb-to-lsb
Byte Order: Network (Big Endian)
Number of text strings: 1 of 9
Comment (xTXt deflate compressed):
I was able to duplicate this by creating an image in GIMP and saving with Adam7
Interlace, file info for that file is:
Image Width: 256 Image Length: 256
Bitdepth (Bits/Sample): 8
Channels (Samples/Pixel): 3
Pixel depth (Pixel Depth): 24
Colour Type (Photometric Interpretation): RGB
Image filter: Single row per byte filter
Interlacing: Adam7 interlacing
Compression Scheme: Deflate method 8, 32k window
Resolution: 2834, 2834 (pixels per meter)
FillOrder: msb-to-lsb
Byte Order: Network (Big Endian)
Number of text strings: 0 of 0
File Attachments
-------------------
-------------------------------------------------------
Date: Mon 09/20/2004 at 09:11 Name: TestPNG.zip Size: 10.37KB By: brubbel
Sample which throws the exception.
http://savannah.gnu.org/bugs/download.php?item_id=10445&item_file_id=1686
For detailed info, follow this link:
<http://savannah.gnu.org/bugs/?func=detailitem&item_id=10445>
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