QTR-Quadtone RIP

Has anyone else had problems using Print Tool when the file has extra channels created.  I use Tony Kuypers Luminosity Mask to create channels to process my files.  I have noticed when i try to print a file with these extra channels I get strange results.  Only part of the picture displays in print tool, and depending what channels I have, it shows bizarre colors.  I tried printing one (using QTR,) and it printed only the part of the print displayed and with very high contrast.  Since I was printing using QTR, I don't know if it would have printed the bizarre colors, but the contrast appears similar to  what is displayed, so assume it would if you were printing through a color app.  Deleting the extra channels seems to cure the problem.

Is this a bug or expected behavior?  Is it not possible to print through Print Tool using channels?

OS X treats an extra channel in an image as an "alpha channel" which
is basically a transparency value.
Photoshop allows more control over usage of channels that OSX just
does not know about or pay attention to.

I would guess if you look at the image in Finder (thumbnails or
quick-look) or Preview you'll see the
same weird results.  Print-Tool not being a photoshop program uses OSX
for its image handling so is
subject to OSX behavior.

Layers are another potential issue for Print-Tool but you get some
more control of behavior.  In Photoshop
when saving an image with Layers there's a Maximum Compatibility mode
that writes out a completely
rendered version of the file in addition to the separate layers.  This
allows other programs to see the
image as Photoshop currently displays it.  I don't know Tony's
workflow but maybe Masks on Layers
could be substituted for the extra channels -- they have a lot of
similar capabilities but you need to think
about them a bit differently.

Roy

On Tue, Dec 4, 2012 at 1:46 PM, john <zonepeter@...> wrote:
> Has anyone else had problems using Print Tool when the file has extra channels created.  I use Tony Kuypers Luminosity Mask to create channels to process my files.  I have noticed when i try to print a file with these extra channels I get strange results.  Only part of the picture displays in print tool, and depending what channels I have, it shows bizarre colors.  I tried printing one (using QTR,) and it printed only the part of the print displayed and with very high contrast.  Since I was printing using QTR, I don't know if it would have printed the bizarre colors, but the contrast appears similar to  what is displayed, so assume it would if you were printing through a color app.  Deleting the extra channels seems to cure the problem.
>
> Is this a bug or expected behavior?  Is it not possible to print through Print Tool using channels?
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>



-- 
Roy Harrington
roy@...m
www.harrington.com

Thanks, Roy.  I figured it might be something like that.  I use the channels to make selections and masks.  It is certainly possible to delete the channels after I use them.  It will be a little more work as it is an iterative process, but not a real problem.  
Thank you again for creating Print Tool!!  

--- In QuadtoneRIP@yahoogroups.com, Roy Harrington <roy@...> wrote:

>
> OS X treats an extra channel in an image as an "alpha channel" which
> is basically a transparency value.
> Photoshop allows more control over usage of channels that OSX just
> does not know about or pay attention to.
> 
> I would guess if you look at the image in Finder (thumbnails or
> quick-look) or Preview you'll see the
> same weird results.  Print-Tool not being a photoshop program uses OSX
> for its image handling so is
> subject to OSX behavior.
> 
> Layers are another potential issue for Print-Tool but you get some
> more control of behavior.  In Photoshop
> when saving an image with Layers there's a Maximum Compatibility mode
> that writes out a completely
> rendered version of the file in addition to the separate layers.  This
> allows other programs to see the
> image as Photoshop currently displays it.  I don't know Tony's
> workflow but maybe Masks on Layers
> could be substituted for the extra channels -- they have a lot of
> similar capabilities but you need to think
> about them a bit differently.
> 
> Roy
> 
> On Tue, Dec 4, 2012 at 1:46 PM, john <zonepeter@...> wrote:
> > Has anyone else had problems using Print Tool when the file has extra channels created.  I use Tony Kuypers Luminosity Mask to create channels to process my files.  I have noticed when i try to print a file with these extra channels I get strange results.  Only part of the picture displays in print tool, and depending what channels I have, it shows bizarre colors.  I tried printing one (using QTR,) and it printed only the part of the print displayed and with very high contrast.  Since I was printing using QTR, I don't know if it would have printed the bizarre colors, but the contrast appears similar to  what is displayed, so assume it would if you were printing through a color app.  Deleting the extra channels seems to cure the problem.
> >
> > Is this a bug or expected behavior?  Is it not possible to print through Print Tool using channels?
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> 
> 
> 
> -- 
> Roy Harrington
> roy@...
> www.harrington.com
>