>>456144
>im gonna swap all the jpegs for cmyk tifs, but thought id pose the question.

oldfag here, been in the printing industry since the 90s.

First, if you are working on a book you should probably use publishing software like InDesign or QuarkXpress.

Second, image resolution is simply proportional to the resolution of the press, and you should be working building to specs from the printer. For instance, if the printer had a press that uses 300 lpi (lines per inch) plates, then your image resolution should be between 300 dpi and 600 dpi. Anything more than that is a waste. File format shouldn't matter since you'll probably submit the job as a PDF anyway.

Third, it's not as important these days to worry about RGB vs CMYK. As long as the images have embedded color profiles the plate separations will be fine. After all, that's the whole point of color profiling. If you are worried about the colors then proof your images in CMYK mode to make sure nothing is out of gamut, but then we run into the problem of "is your working environment properly calibrated" which is outside the scope of this reply.

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