QTR-Quadtone RIP

After printing using QTR the same image more than 20 times in two 
different sizes in my efforts to resolve an issue (that thank goodness 
is now resolved) a single white line suddenly appeared in my prints; 
it's about 1/4" from the leading edge of the paper and about 1/8" from 
the leading edge of the printed area; it's about half as wide as the 
line from a 0.5mm thick mechanical pencil. It showed up in the last 
five prints. I've uninstalled the QTR program and reinstalled it, but 
the line is still there. There is no line when I print with the Epson 
driver. Searching through this forum I came upon the hint that curled 
printer paper might be the cause, but my paper is as straight as an 
arrow.

I would really appreciate any suggestions that you might have.

Frans Waterlander

Fred, it sounds like some corruption in a temp file that's only used by 
QTR. 

I'm far from expert, but a dedicated QTR temp file is apparently what 
QTR driver prints from..it's what we see on the QTR viewer...it's not 
used by the Epson driver, even though you can often, but unreliably 
return to it if you leave and go back to QTR (mine vanishes 
unpredictably, requiring search of HD for the original file... Epson 
driver uses the original file, not that QTR file). What I'm describing 
is accidental learning or superstition, I've not read about it anywhere.

I'd suggest Start>Disc Cleanup if you're using XP, then searching HD for 
the original file when you're in QTR. That will eliminate old, possibly 
corrupted temp files that may be the source of your problem. It'll also 
speed your computer. With my setup it's crucial to regularly do that 
Cleanup when I'm Photoshopping because I run out of C-drive space otherwie.

John and, I believe, Sarah,

I think I have traced the problem to some intermittent clogged light 
black, light cyan and light magenta nozzles of my Epson 2200 printer. 
After repeated cleaning the clogs disappeared and the QTR prints look 
fine now. It seems that, possibly because of different dithering, QTR 
is more sensitive to this kind of problem. I'll need to keep a close 
eye on clogged nozzles.

I believe Sarah sent me an email and I deleted it, thinking her post 
would be on the forum which it was not, but thanks anyway! The white 
line appeared at the leading edge, not the trailing edge and there was 
more than 1" of paper beyond the trailing edge of the printed area.

Frans Waterlander