Color problem in printing

As long as the profile is embedded in all of them, there's no such thing as "hidden" flaws. You'd see it.

However - one thing I can think of is a monitor with poor shadow separation. Shadow color casts can be difficult to spot without a very good monitor.

Are they all from the same master file, or are they created separately? You can look at the histogram to check for shadow color casts.

If they look the same and have identical embedded profiles, then it is a question to ask the printer/printing company that you are sending the PDF to..

Or, if you are connected directly to the physical printer yourself and printing from Photoshop, check that in both cases: the media settings are the same in the print driver, Photoshop manages colours is chosen , print colour management inside the printer driver is off, and the correct print profile for your printer and media combination is selected. That should give consistent results.

Dave

the embedded color profile used is as follows:
sRGB IEC 61966 2.1

But if several panels are sent in the pdf, why do some come out well and others not if in theory they are embedded with the same profile?

Is there an embedded color profile? The profile is what defines the color.

In some cases, if going directly to press, a pdf doesn't have the actual profile embedded, but then there will always be an "output intent" that defines the color space. Either way, the given icc profile unambiguously defines the colors in the file.

Any deviation from that is the printer's responsibility.

I assume the printer runs a color managed process.