QTR-Quadtone RIP

Roy Harrington wrote:

>>
> 
> I think Ernst may have pinpointed the issue.


Roy,

I'm not so sure about that right now.  I have done this before 
and I think I made the same mistake again. Qimage actually 
does exactly the same as Photoshop does when CM is off in both 
applications. When CM is off in PS the Greyscale one will 
convert to the same RGB numbers the Qimage conversion makes 
when CM is off. So Qimage and Photoshop behave the same when 
CM is off. The plain TIFF converter of my website that has no 
CM at all produces the same numbers.

When the Qimage Print to File RGB file is brought back into 
Photoshop  and converted to greyscale (with CM on) to compare 
it to the original that was loaded to Qimage then there's a 
difference but that is because the CM in Qimage was off and 
the CM in Photoshop was on. With CM off in Photoshop the 
Qimage produced RGB file will convert back to the same 
greyscale percentages on the steps.

I guess QTR has the same conversion for RGB>Greyscale as 
Qimage and Photoshop have with CM off. In that case my 
workflow with greyscale converted to the QTR grey printer 
profile, then loaded in Qimage with CM off and the print to 
file RGB sent to QTR which converts it back to greyscale is 
still valid and there is no fault in Qimage.

Ernst

-- 

                    --
           Ernst Dinkla


www.pigment-print.com
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