We use a ton of duotone images, which can only be saved as EPS or PSD files. When I preflight any of these duotone EPS files or look in the info palette for them (from within InDesign), the fields for actual and effective ppi are left blank. Is there some other way for me to find the effective resolution of these dutones? Our art department likes to have flexility in how they crop and/or size images, so the effective ppi could be very different from the actual ppi. We'd rather not have to save them as PSDs.