So my latest Blurb book came and it has a blue cast to the B&W images in daylight - they look neutral in Tungsten light. My older version is warmer in tone so that it looks neutral in daylight and slightly sepia in Tungsten.

It's not objectionable but I prefer the warmer look for my work.

Any clue whether this the normal "drift" for an HP Indigo? Or is there a check box somewhere?

Color images look OK, cover is nice.

I am taking greyscale and RGB images and converting them to CMYK usung the Blurb CMYK profile, then placing them into InDesign, then exporting a PDF to Blurb's specs.