QTR-Quadtone RIP

Use Qimage to scale the image from say a 300 dpi TIFF to 720 dpi which
the driver expects. Set the Epson printer driver to either print at
1440 ppi or 2800 ppi and use QTRIP to process the B&W which sends it
to the driver which in turn talks to the hardware that takes care of
sending ink to the paper at either be 1440 ppi or 2800 ppi.

I previously posted my question to the qimage yahoo group and received
the following link that seems to provide most of the answers I was
looking for:

<http://forums.dpreview.com/forums/read.asp?forum=1003&message=16814115>

Enjoy,
Pierre

--- In QuadtoneRIP@yahoogroups.com, joachim oppenheimer <joachim2@...>
wrote:
>
> Thank you very much for your response to my inquiry. As I understand it,
> QImage would scale the image (presumably without significant loss of
> quality) to 1400 or  higher dpi on an Epson that is factory-set to
accept
> files at 720 dpi. Do I understand you correctly? Joachim
> 
>   -----Original Message-----
>   From: QuadtoneRIP@yahoogroups.com
[mailto:QuadtoneRIP@...m]On
> Behalf Of ve2caz
>   Sent: Friday, August 11, 2006 1:49 PM
>   To: QuadtoneRIP@yahoogroups.com
>   Subject: [QuadtoneRIP] Re: QImage
> 
> 
>   Bear in mind that I am investigating this so I have no real experience
>   with any of these software but what follows is my understanding.
> 
>   Basically Canon and HP printer drivers expect images at 600 ppi
>   whereas Epson printer drivers expect images at 720 ppi. These drivers
>   will accept images at other ppi settings but then the printer drivers
>   are forced to scale the images back to these values.
> 
>   There are a variety of scaling algorithms out there but they do not
>   all produce the same quality when used. Photoshop scaling usually
>   involves Bicubic/Bicubic Smoother/Bicubic Sharper to name a few. If
>   you scale an image to say achieve a print of 8"x10"@300 ppi and send
>   it to the printer driver, the driver will scale it further using some
>   algorithm so that the results are 8"x10"@720 ppi for an Epson printer.
>   The result of which is two passes of scaling with less than perfect
>   algorithms.
> 
>   That is where Qimage comes in. If you leave your image set at 300 ppi
>   and at the native resolution this would normally generate an image in
>   5"x7" size for example, you would just go into Qimage and ask it to
>   print the image at 8"x10". Qimage will take care of all those details
>   and produce the highest quality print.
> 
>   Now this claim is really based on having access to scaling algorithms
>   that are of very high quality. You could do this yourself if you have
>   other tools allowing you to scale images and then just print them off.
> 
>   The fact is that Qimage just makes this simple and takes care of lots
>   of annoying things that you would normally have to do.
> 
>   What I do not know is what happens if you scale an image using Qimage
>   so that it is at 720 ppi (or 600 ppi) and then feed this to QTRIP?
> 
>   I vaguely remember reading somewhere that QTRIP expects files to be at
>   300 ppi so I don't know if this would defeat the purpose of high
>   quality scaling of images for the purpose of preventing the driver
>   from scaling it using some unknown algorithm.
> 
>   I hope this helps.
> 
>   Pierre
> 
>   --- In QuadtoneRIP@yahoogroups.com, "mohonk1986" <joachim2@> wrote:
>   >
>   > I prepare my work in PhotoshopCS2 and print on the Epson 2200 using
>   > the QuadtoneRIP. I have noted and am confused by references to
Qimage.
>   > What role, if any, should QImage play in the workflow? What are the
>   > purported advantages? I would appreciate explanation of that program
>   > as it relates to QuatoneRIP. Thank you. Joachim
>   >
>