I may have found the cause of the faint checkerboard pattern. (The proverbial thorn in the haystack.) When I finish soft proofing I use Pixel Genius 2 for output sharpening. On a tinted b&w image for Epson Luster on an Epson 2880 I apply 'inkjet printer glossy' for the output command. And that's when the pesky pattern appears- not only on the preview, but also on the actual print. What mistake am I making ? What output setting is the right one ?
Mr. Schewe, if you read this please chime in !
Thanks everyone for checking this out.