The reason I asked was because the majority of the images have a very strong color bias:
Which is unusual for this type of application where typically images have more variety of hues in order to help balance out ink usage on press.
Also, do the cmyk "neutral" color images make use of GCR or UCR, and if so, can you determine how strong the chromatic color replacement was?
I agree the strong color bias of the images could cause balancing issues on press without carefeul planning of the test chart. I don't introduce any images to the standardisation procedure until my TVI/solid/overprint chart meets ISO tolerances. The image test chart is a useful tool though - I generally get the customer to plate and print the chart using their existing workflow and methodology (ie usually by eye to a proof) and then output the chart again using the newly created curves.
I have attached a lo res of the visual chart I used just this morning (with great success!)...
re UCR and GCR, the supplied CMYK from bvdm are separated as follows:
photoshop cs3
Adobe ACE CMM
perceptual to IsoCoatedV2_eci
(Fogra 39 and 39L dataset)
Paper type 1 and 2
TAC=330
max black=95
k length=9
k width=10
I do quite a bit of work with both RGB separation and CMYK re-separation through GMG colorserver, as well as the assesment of chromatic color replacement with Ink Optimizer. i find the 'neutral' images particularly useful in assessing the quality of separation/reseparation and undercolor removal. (i usually proof CMY and K progressives to check this before going near the press).
in the Roman16 book, BVDM explain (at quite some length!) their reasoning behind the images containing what they describe as a "reduced image language" in terms of content, subject and chromaticity. I won't go any further into their explanations here, but suffice to say they have put a lot of supporting data and information into the pack - which wasn't cheap, but has proven worth every penny..
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