First thing to do is check the separations preview and see if the colors really are the same. If the logo was saved in a different color space with an embedded profile, ID might be converting colors.
It's very likely a print issues, though, with how your printer handles raster vs. vector content. See InDesignSecrets » Blog Archive » Eliminating YDB (Yucky Discolored Box) Syndrome
I just checked the separations and there are none showing. The logo was created in photoshop, which I have setup with identical colour settings as InDesign, using an RGB workflow; could this be the problem?
I find colour management a nightmare and recently calibrated the printer I am using. I read the Eliminating YDB syndrome article, took the advice and still found the colours were playing up.
I suspect it is a print issue, but I can't understand what it could be! The rest of the document prints well; its just this logo!
I just checked the separations and there are none showing.
Do you know HOW to use the separations preview? You need to set it to show separations from the dropdown, then hover the cursor over differnt parts of the page to read the numbers...
Sorry, that information was incorrect; when i use the logo with the grey background, it is showing up with various percentages of CMYK inks, but the document background grey is 0% for all CMYK inks and 100% for the custom Pantone colour i specified.
when i use instead a logo with a transparent background, the colour separations are, rightly so, identical over these areas.
the printing issue are the same whichever method i use.
when i use the standard High Res transparency flattener preset, i get the funny different colours, and only when create custom preset and set the raster/vector slider to '0' does the differentiation disappear and replace the entire background colour with a magenta/green grey.
Sounds like you are using a Pantone Spot color for the background, and an RGB mix for the logo. They will never match. Unless you use a special spot color channel in Photoshop you simply are getting a simulation of the Pantone color inthe current working space.
Is there a compelling reason to have made the logo in Photoshop instead of Illustrator? Spots are much easier to deal with in Illy, and you won't get the raster/vector disconnect during printing. In any case, unless this is destined to be printed with actual spot color inks on a printing press, there's no good reason to specify a spot color.
ahh, well when I created the swatch, I enetered the RGB references specified by the Pantone chart - so I'm not exactly sure if this means I have an RGB or a Pantone colour here?
I have converted this spot to process, which tidies things up.
You have solved my problem though, as we found the original EPS file, inserted that and hey presto, the problems have vanished! So thank you very much for your help
when I created the swatch, I enetered the RGB references specified by the Pantone chart - so I'm not exactly sure if this means I have an RGB or a Pantone colour here?
Both RGB colors and Spot colors can have RGB values. Knowing whether you entered the RGB values does not tell us if you have Spot color or a Process color. You need to check the Color Type dropdown in Swatch Options.
More to the point on this, I think, is that both RGB and CMYK values listed for any spot color are "best approximations" (many, perhaps most, spot colors have no good CMYK equivalent, and that would be true as well for some subset using RGB) using Pantone's unknown color space. Even in that space the probability of getting an actual match between the simulation and the true spot ink is close to zero. Using some other space makes things worse, and since there is no way to know the sapce in use at Pantone, you're kind of up the creek.
For CMYK converison you can do reasonably well by using the Ink manager to convert the spot to process and check the bok to Use Lab Values at the same time. For RGB, I have no idea how to come close, at all.