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Rendered PNGs have EXIF chunks after IDAT chunks, causing validation failure #123620

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opened 2024-06-23 03:18:19 +02:00 by sdmtr · 4 comments
sdmtr commented 2024-06-23 03:18:19 +02:00
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System Information
Operating system: Linux-6.8.0-76060800daily20240311-generic-x86_64-with-glibc2.35 64 Bits, X11 UI
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 550.67

Blender Version
Broken: version: 4.1.1, branch: blender-v4.1-release, commit date: 2024-04-15 15:11, hash: e1743a0317bc
Broken: 3.6
Worked: 3.5

Short description of error
PNG files rendered in 4.1.1 have EXIF chunks after IDAT chunks, which causes them to fail validation with pngcheck / exiftool et al.

Exact steps for others to reproduce the error

  1. Render out a PNG
  2. Validate it with pngcheck / exiftool, generating the following errors:

pngcheck: /tmp/frame-0001.png multiple eXIf not allowed
exiftool: Warning: [minor] Text/EXIF chunk(s) found after PNG IDAT (may be ignored by some readers)

Additional info
The attached image was generated by running blender --factory-startup and rendering out the first frame of the default startup file as an RGBA PNG with 16 bit colour depth and no compression, with all options in the Output > Metadata sidebar menu turned off.

Thanks for your time and attention, I appreciate the incredible work of the Blender community more than I can possibly express.

**System Information** Operating system: Linux-6.8.0-76060800daily20240311-generic-x86_64-with-glibc2.35 64 Bits, X11 UI Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 550.67 **Blender Version** Broken: version: 4.1.1, branch: blender-v4.1-release, commit date: 2024-04-15 15:11, hash: `e1743a0317bc` Broken: 3.6 Worked: 3.5 **Short description of error** PNG files rendered in 4.1.1 have EXIF chunks after IDAT chunks, which causes them to fail validation with pngcheck / exiftool et al. **Exact steps for others to reproduce the error** 1. Render out a PNG 2. Validate it with pngcheck / exiftool, generating the following errors: > pngcheck: `/tmp/frame-0001.png multiple eXIf not allowed` > exiftool: `Warning: [minor] Text/EXIF chunk(s) found after PNG IDAT (may be ignored by some readers)` **Additional info** The attached image was generated by running `blender --factory-startup` and rendering out the first frame of the default startup file as an RGBA PNG with 16 bit colour depth and no compression, with all options in the Output > Metadata sidebar menu turned off. Thanks for your time and attention, I appreciate the incredible work of the Blender community more than I can possibly express.
frame-0001.png
16 MiB
frame-0001.png
sdmtr added the
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 labels 2024-06-23 03:18:20 +02:00
Philipp Oeser commented 2024-06-24 13:46:17 +02:00
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Can confirm, will check (broke between 3.5 and 3.6)

Can confirm, will check (broke between 3.5 and 3.6)
Philipp Oeser added
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 labels 2024-06-24 13:46:40 +02:00
Philipp Oeser commented 2024-06-24 14:53:02 +02:00
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Probably caused by aa3bdfd76a

CC @deadpin

Probably caused by aa3bdfd76a3dc6536532f3cfd4d6313f09805817 CC @deadpin
Jesse Yurkovich commented 2024-06-25 20:43:58 +02:00
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This is a bug in our version of libpng and was fixed upstream: https://github.com/pnggroup/libpng/issues/480 (commit e6c5bf46c4)

I'll ask for our version of the library to be updated for 4.3 (it's too late for 4.2 and this really is a "minor" warning as exiftool describes it; at least I'm not aware of any image viewer refusing to open our files).

This is a bug in our version of `libpng` and was fixed upstream: https://github.com/pnggroup/libpng/issues/480 (commit https://sourceforge.net/p/libpng/code/ci/e6c5bf46c4fa3e3738a2ed0896ce33fc270e0cac) I'll ask for our version of the library to be updated for 4.3 (it's too late for 4.2 and this really is a "minor" warning as exiftool describes it; at least I'm not aware of any image viewer refusing to open our files).
Bastien Montagne added this to the Core project 2024-07-02 10:44:21 +02:00
Bastien Montagne commented 2024-08-01 10:35:33 +02:00
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Added entry to request libPNG 1.6.43 to the 4.3 libs task (#125241).

Added entry to request libPNG 1.6.43 to the 4.3 libs task (#125241).
Bart van der Braak added
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 labels 2024-08-14 12:58:38 +02:00
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Reference: blender/blender#123620
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