Two tricolor prints
On Sep 25, 2007, at 4:54 PM, Katharine Thayer wrote:
Here's a comparison of an image printed from the colorized and calibrated separations, and the same image printed from separations made by simply inverting channels and printing without further manipulation . The jpeg is rather small because I was intending to append it to a post on another forum, but since the question of calibrating tricolors came up here in the meantime, decided to just put it up on my site; at any rate it's not necessary to see detail; the difference in the vividness of the color, which is the issue of note here, should be quite apparent even in the small images.
I named the page rather cockily "If it ain't broke..." but it is a little broke in fact; the greyscale separations can make a print that's too contrasty, which is the reason I decided to see if I could get an improvement with colors and curves. But so far, I'll take the straight inversions even with blown highlights. This isn't just an anomaly; I did several prints with different pigments and proportions and got the same cloudiness on all of them.
I've been thinking for a while of switching to Prussian blue for tricolors, and these are my first prints with Prussian; it will definitely be my blue of choice for tricolor from now on. I'm still playing with pigments and proportions to balance the Prussian, but the combination I used here gives a fairly close approximation to the original colors.