1.8.3.627: Image bit depth changed during PDF export

[Daniel Kuhlmann]

When I export a 16bit image that has neither been downsampled or cropped by Publisher, the PDF correctly includes a 16bit image.

However, if the image has been downsampled or cropped by Publisher, the PDF shows an 8bit image. 

Although there are not many use cases for 16bit images in PDFs, I assume that it will lead to possible confusion and errors if 16bit and 8bit images get unintentionally mixed in the same PDF, just depending on whether they were cropped in Publisher or not.

Many thanks,
Daniel

[walt.farrell]

5 minutes ago, Daniel Kuhlmann said:

However, if the image has been downsampled or cropped by Publisher, the PDF shows an 8bit image. 

Please clarify how you are downsampling. Is that via the More options during Export? Or some other way?

Also, there are several ways one might crop an image in Publisher, including using the Crop Tool in the Publisher Persona, or a Picture Frame, or clip-nesting with a rectangle. Which method did you use?

Can you provide a sample .afpub file, and the Export settings you used?

Thanks.

[Daniel Kuhlmann]

Thanks for your quick reply, Walt.

I used a Picture Frame. For export, I started with the standard PDF (for print) export setting and deactivated "Allow JPEG compression" as JPEGs can only be 8bit anyway.

A sample .afpub file and linked 16bit image are attached.

Best,
Daniel

Pub_16bit.tif 16bit export.afpub

[Gabe]

Hi both,

We are aware of this and it has already been logged with our developers. 

[Daniel Kuhlmann]

Thanks a lot, @Gabe!

[Patrick Connor]

We have made fixes/improvements to this area (PDF export - Placed images with different bit depth and icc colour profile) of the program in the latest release.

The fixes and how to update are described in these forum posts.

• Affinity Designer 1.8.4 for Windows            ( Microsoft Store and Affinity Store )
• Affinity Designer 1.8.4 for macOS               ( Mac App Store and Affinity Store )
• Affinity Designer 1.8.4 for iOS                      ( Apple iPad Store )
   
• Affinity Photo 1.8.4 for Windows                ( Microsoft Store and Affinity Store )
• Affinity Photo 1.8.4 for macOS                   ( Mac App Store and Affinity Store )
• Affinity Photo 1.8.4 for iOS                          ( Apple iPad Store )
    
• Affinity Publisher 1.8.4 for Windows         ( Microsoft Store and Affinity Store )
• Affinity Publisher 1.8.4 for macOS            ( Mac App Store and Affinity Store )

We would appreciate you checking that this issue has now been resolved for you.

[Daniel Kuhlmann]

Issue has been solved. Many thanks!