Selective downsampling when exporting to PDF?

Hi,
I have a booklet with a number of pics in it. When I export such a job to PDF to create a print-ready version normally I'd just set it to downsample all images to 300 dpi, but in this case some of the pics are technical drawings with text and fine lines that I'd prefer to keep at a higher res - even up to 1200 dpi if possible (the drawings are large enough to provide this quality).
So, is there a way of tagging individiual images in InDesign such that they won't be downsampled on export to PDF?
Cheers,
MP

@MP – there is a way to get the high-res images to the final PDF after you are downsampled the PDF. But this is a labor intensive process and requires Acrobat Pro and PhotoShop.
There are also some restrictions.
1. The PDF must not be flattened by flattening transparency.
PDF/X-4 as output would be ok with that. No PDF/X-3, no PDF/X-1a, if possible…
2. You cannot use images with a clipping path
Avoid to process, because some extra steps are necessary,
3. If Images or their containers are rotated and/or sheared
4. If the images are scaled unproportionally
5. If images are cropped
The process would be:
Open the downsampled PDF in Acrobat Pro.
Open PhotoShop with the original image in high-res quality.
In Acrobat Pro use the TouchUp object Tool to open the low-res image in PhotoShop.
In PhotoShop set the resolution of the downsampled image to the resolution of the original without changing its dimensions (width x height); in effect up-sample the image to its original values.
Copy/Paste the pixels from the high-res original to the one opened from Acrobat Pro.
Merge all layers to the background layer.
Save and close the one opened from Acrobat Pro.
It's clear that this process is labor intensive and could only be a workaround, if just a few images should maintain a very high resolution.
And: it's highly debatable…
Why not leaving all images at high-res?
File size? No problem in workflows nowadays, I think…
Uwe

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