Photoshop file looks pixelated in InDesign

[LoveGod]

Hi,

I am making a book in InDesign CC 2017.1 with illustrations from Photoshop.

When I place the photoshop file into the ID document, the image looks pixelated, but when I export it as a PDF, it looks fine.

I am viewing it with "High Quality Display" selected, but it doesn't help.

How do I get it so it looks like it will when I export it for print?

Here is a screenshot of the pixelated image...

[Jacque25827912b1ke]

Question for all of you (not really related to OPs question). When I posted above, my email address is incorrect and uses an old Google email. When I went into my Google account, that old email is nowhere to be found. So odd. 

[Willi Adelberger]

Your answer is wrong and destructive. With flattening the PSD file you loose layers, transparency and all layer compositions. All should be alive to be usable in InDesign. I gave above the correct answer: Save as PDF with all layers. Place the PDF, not the PSD.

[Jacque25827912b1ke]

Help me to understand then as I am doing a book also in InDesign. I save a copy with all the layers. And then flatten the image and import that into InDesign. When I PDF it, everything looks fine. When I print it, everything looks fine. Thanks for your input.