how do I know if an image resolution is high enough for print

[Tamsin0D44]

I have created a magazine and imported many images.  some i had to expand the size, others i had to shrink.  

I am worried the ones I expanded will come out pixilated in the final printing.  How can I tell which images need to be replaced for acceptable print quality?

[c.pfaffenbichler]

You could click each image individually and check its Effective Resolution in the Info Panel or you can create a Preflight-profile to check the resolutions. 

[Tamsin0D44]

thanks so much.  

great help.

[jmlevy]

You can also see the effective resolution info in the Links panel and IMHO, it's quicker than looking at the info panel for each image.

[Eugene Tyson]

I wrote an article here which will have some tips

https://creativepro.com/high-res-image-look-low-res/#:~:text=By%20default%2C%20InDesign%20is%20set,a....

Best way I find is to setup the Preflight panel to detect image resolution. 

Which is covered in my article. 

[Laubender]

Hi Tamsin0D44,

jmlevy's idea is a good one. Just have a list of effective PPI values in the Links panel.

If you see two values for one image you have scaled the image unproportional.

You can even sort the listed images by the values of their effective PPIs if you want.

But with InDesign's preflight there is an additional benefit:

Preflight is also able to flag placed PDFs, AIs and EPS files that contain image pixel data.

Regards,
Uwe Laubender

( ACP )