If you’re using a modern workflow, it won’t matter and for most jobs even 300ppi is overkill.
The images will be downsampled on export to PDF.
As for CMYK, again, a modern workflow will be fine with properly tagged RGB images. Export the document to PDF/X-4 and you should be good to go.
I’d be suspicious of any printer that won’t accept that.
This is great thank you, really..
The Job is a large hardback book with lots of colour photos..
Really appreciate your response..
Bear in mind
1. The effective resolution is what matters. If you double the size, that 300 ppi image is only at 150 ppi.
2. PDF export will BY DEFAULT reduce resolution, but it's your choice.
3. Certain types of image benefit from higher resolution; 300 ppi is for photos. Scanned line art, especially scanned text, need higher resolution.
4. Don't try to come up with your resolutions etc. without talking to the printer about what is actually needed for your job, your paper stock, your printing technology, and their equipment. People often seem desperate not to have this conversation, but you just end up having it later when things have gone wrong...
Thanks for your reply.
I generally work with 300dpi for all my imported media, however, my client is scanning old film stills, so I'm wondering if I need to change them to 300dpi before importing them into InDesign or if I can work with 600dpi and any issues will be covered during compressing for print.
You don't need to change the 600ppi images. InDesign scales resolution with the image--if you scale your 600ppi image to 200% the pixels will double in size to 300ppi. The scaled resolution is the Effective res listed in the links panel. Actual resolution is the resolution when the image is left at 100%.
When you export, you can choose to lower the Effecive res in the exported PDF or leave it unchanged. Depending on the settings, an exported PDF could have a mix of image resolutions or a uniform maximum resolution.
Thanks Rob, this helps a lot.. This is the first time I've worked on such a big project with imagery being presented at higher dpi than 300..
Really appreciate all the feedback