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Daniel Kuhlmann

1.8.3.627: Image bit depth changed during PDF export

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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

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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.


-- Walt

Windows 10 Home, version 1909 (183623.476),
   Desktop: 16GB memory, Intel Core i7-6700K @ 4.00GHz, GeForce GTX 970
   Laptop:  8GB memory, Intel Core i7-3625QM @ 2.30GHz, Intel HD Graphics 4000 or NVIDIA GeForce GT 630M
Affinity Photo 1.8.3.641 and 1.8.4.650 Beta   / Affinity Designer 1.8.3.641 and 1.8.4.650 Beta  / Affinity Publisher 1.8.3.641 and 1.8.4.651 Beta.

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