QTR-Quadtone RIP

Roy,

I am seeing a "shadow edge" along the edge of sharp transitions in 
density when printing with QTR on the R1900. I've tried Hybrid and 
Adaptive dithering both give same result.

I don't see the "shadow edge" when printing with the epson driver.

I am seeing these "shadow edges" in transitions from dark to light in 
the direction of printing, but not from light to dark.

I set up a test print with an example image showing the transition 
issue and the same image rotated 180 degrees. I've scanned the test 
print @ 2400 dpi and cropped it to get the file size down.

I've uploaded it to the files section as "1900 QTR dither issue".
The left image has a clearly visible shadow along the dark edge - see 
arrow.

Would appreciate feedback on why this is occuring. Presumably this is 
reducing visable print resolution and tonal distribution. Also would be 
interested to know if others see this problem on different printers.

Txs,

Mike