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Thanks for the info! Any suggestion on the workaround?
I'm opening the sliced images in Acrobat so I can convert them to PDF.
By @katinkaing
Photoshop can save as PDF, there should be no reason to open or convert the sliced images in Acrobat.
I tried resizing the original image so the exported slices are smaller but the quality was bad, tried resizing the exported images but same result. At 72dpi the size is perfect but rubbish resolution.
By @katinkaing
That would have worked if they were saved out after resetting the ppi, without any resampling.
You said the tiles ended up 83*108 cm each. If what it actually said was 83.33 x 108.34 cm, and we assume 72 ppi (the default assumed for images with no ppi metadata), then:
83.33 x 108.34 cm at 72 ppi actually equals 20 x 26 cm at 300 ppi. It’s the same number of pixels (2362 x 3071).
So then, if I was trying to fix this, one way would be to create a Photoshop action that does this:
1. Open a tile.
2. Choose Image > Image Size.
3. Make sure Resample is deselected (very important).
4. Change Resolution to 300 ppi. It should now read 20 x 26 cm at 300 ppi.
5. Click OK.
6. Choose File > Save a Copy, choose a file format, save.
Run the above action on all other tiles.
If you watch the pixel Dimensions line in the demo below, it does not change during this edit. That shows that the image content does not change, no detail is being lost, because it’s the same number of pixels before and after (because Resample was disabled). The only thing that changes is how dense the pixels should be assumed to be, which is what ppi resolution metadata is all about.
The reason to use Save a Copy in step 6 is so that the resolution metadata is embedded. Most other export methods in Photoshop do not preserve resolution metadata.
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