I have a document with a few pages (each page is a separate poster that will be printed).
On each page I have different objects. All are tiff but two of them are transparent tiffs and I noticed that these two fiels are less saturated, and they also affect the rich black background beneath.
Any ideas why this happens and how I can make transparent tiffs look like those with solid black backgrounds without applying an actual background?
Most likely the Transparency Blend Space is set to CMYK and changing it to RGB will improve the on-screen rendition, but your prints may still be less saturated if your colors are out of gamut for the printing process.