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Blender saves malformed png files that can't be opened by exiv2 library #112275

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opened 2023-09-12 12:40:45 +02:00 by M Z · 5 comments
M Z commented 2023-09-12 12:40:45 +02:00
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System Information
Operating system: Windows-7/10

Blender Version
Broken: version: 3.6.0 - 3.6.2
Worked: 3.4.1 for sure, most probably 3.5

Short description of error
Blender saves malformed png files that can't be opened by exiv2 library.
More in-depth analysis: https://github.com/Exiv2/exiv2/issues/2745

There are actually 2 (identical!) eXIf chunks in this PNG file, but very short so might not carry any significant metadata:

Btw, exiftool -v3 also warns about overlapping TIFF directories, so at least that should be reported to Blender as well

Ok, so the TIFF signature 4d 4d 2a 00 is invalid for this eXIf chunk. For big-endian encoding, it must be 4d 4d 00 2a.
This is a Blender (or whatever library they use to write PNGs) bug.

Exact steps for others to reproduce the error

  1. Render image
  2. Save as png
**System Information** Operating system: Windows-7/10 **Blender Version** Broken: version: 3.6.0 - 3.6.2 Worked: 3.4.1 for sure, most probably 3.5 **Short description of error** Blender saves malformed png files that can't be opened by exiv2 library. More in-depth analysis: https://github.com/Exiv2/exiv2/issues/2745 > There are actually 2 (identical!) eXIf chunks in this PNG file, but very short so might not carry any significant metadata: >Btw, exiftool -v3 also warns about overlapping TIFF directories, so at least that should be reported to Blender as well >Ok, so the TIFF signature 4d 4d 2a 00 is invalid for this eXIf chunk. For big-endian encoding, it must be 4d 4d 00 2a. >This is a Blender (or whatever library they use to write PNGs) bug. **Exact steps for others to reproduce the error** 1. Render image 2. Save as png
M Z added the
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 labels 2023-09-12 12:40:46 +02:00
Iliya Katushenock added the
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 label 2023-09-12 13:43:15 +02:00
Iliya Katushenock commented 2023-09-12 13:44:14 +02:00
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The bug is not in the blender, is it? If another program cannot open the data, the first step is to check whether others can open it.

The bug is not in the blender, is it? If another program cannot open the data, the first step is to check whether others can open it.
M Z commented 2023-09-12 14:35:45 +02:00
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It is a Blender's bug, as files saved in Blender do not conform to the standard. In the provided link you can check more in-depth analysis why these files are not correct.

It is a Blender's bug, as files saved in Blender do not conform to the standard. In the provided link you can check more in-depth analysis why these files are not correct.
Brecht Van Lommel commented 2023-09-12 14:49:56 +02:00
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I guess this started happening with the switch to OpenImageIO. CC @deadpin.

I guess this started happening with the switch to OpenImageIO. CC @deadpin.
Jesse Yurkovich commented 2023-09-12 20:17:49 +02:00
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I have a PR out for OIIO now dealing with the main issue that prevents loading: https://github.com/OpenImageIO/oiio/pull/3984

I have a PR out for OIIO now dealing with the main issue that prevents loading: https://github.com/OpenImageIO/oiio/pull/3984
Jesse Yurkovich added
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 labels 2023-09-12 20:18:05 +02:00
Jesse Yurkovich commented 2023-10-20 01:28:48 +02:00
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The fix should now be available in 3.6.5 as well as the pending 4.0 release.

The fix should now be available in 3.6.5 as well as the pending 4.0 release.
Blender Bot added
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 labels 2023-10-20 01:28:54 +02:00
Jesse Yurkovich added
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 labels 2023-10-20 01:29:15 +02:00
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Reference: blender/blender#112275
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