What do you mean by 'print it in PDF'? The best way to create a PDF from InDesign is using File > Adobe PDF Presets. Each of these presets will apply different levels of compression and downsampling (making your images lower resolution). If you have large PSD file placed in your document, even the highest quality PDF settings will usually create a PDF file smaller than the PSD. Which setting you choose depends on the purpose of the PDF (print, soft proof, web etc).
In addition to what Danny has said, InDesign uses a low-resolution proxy for image preview by default. You can change the Display Performance settings to High Quality Display, but you will still be looking at a screen preview of the image, not the actual pixels. Actual image pixels are used at output, subject to the settings you choose. If printing direct from ID, try setting the value for Send Image Data to All in the print dialog.
Thanks Danny for your clear answer. I had exported the files from InDesign by using the highest PDF resolution (for printing purpose) but the image quality is really not as high as the PSD images I have created on Photoshop. Of course, I may have some downsampling anyway...
However, I noticed that InDesign can provide information on the imported picture, in this case the PSD image has the followings caracteristics: ICC profile: RVB, size: 15 Mo and 72 DPI resolution, are those a problem in order to get good quality images while I will export them to PDF? Should I "prepare" the images that I import in ID in order to optimize the image quality of the finale PDF document? Such as CMJN, DPI resolution, size... etc or is it not useful? Thanks for your answer.
InDesign will report two resolution numbers, the Actual PPI (the resolution at the size the image was originally saved) and the Effective PPI (the resolution at the size you are using the image). Only the Effective Resolution is important.
Well, 72 dpi is not sufficient for any good quality printing. May be OK on screen, depending on the original. What is the intended purpose of the PDF?
The catalog I am editing should be sent by mail, but possibly printed...
The effective PPI is 304, sufficient I guess (while the Actual PPI is of 72
Thanks for all those precisions, I guess that the compression create some
fuzziness / blurring and this is unfortunately unavoidable.
2015-09-15 12:01 GMT+02:00 Peter Spier <email@example.com>:
InDesign image definition issue, while importing PSD / JPEG images created
by Peter Spier <https://forums.adobe.com/people/Peter+Spier> in InDesign
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No, it's certainly avoidable. You can test this by making a custom PDF export.
* Turn off subsampling/downsampling
* Set ZIP compression for colour and greyscale
If the quality is still poor, it's a limitation of the PDF viewer, not the making of the PDF or InDesign. At least with PNG. With JPEG you lose quality by placing, but only to the same extent as you see on screen. However, it's best to avoid JPEG as a working format for this reason.
Another possibility is that the links are not up-to-date.