QTR-Quadtone RIP

I'm not sure what I'm doing wrong here. I scanned some black and white images in RGBI mode in VueScan, converted to 16 bit greyscale. When I go to QTR to print, most of the image previews display normally, but once in awhile I get a black preview. If I convert those images to 8-bit, the image previews come up normally. Why would some 16-bit greyscale previews display normally while others not?

Larry

As usual, I seem to answer my questions as soon as I post my questions...

It seems to have something to do with file size.  If I flatten the image, the preview shows.  It appears as if the maximum file size is around 600 MB
Larry
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On Sat, 5/28/16, pianoquartet@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:

 Subject: [QuadtoneRIP] Image preview completely black
 To: QuadtoneRIP@yahoogroups.com
 Received: Saturday, May 28, 2016, 10:27 AM
 
 
  
 
 
 
   
 
 
     
       
       
       I'm not sure what I'm doing
 wrong here.  I scanned some black and white images in RGBI
 mode in VueScan, converted to 16 bit greyscale.  When I go
 to QTR to print, most of the image previews display
 normally, but once in awhile I get a black preview.  If I
 convert those images to 8-bit, the image previews come up
 normally.  Why would some 16-bit greyscale previews display
 normally while others
 not?Larry
 
     
      
 
     
     
 
 
 
 #yiv0672976596 #yiv0672976596 --

Thanks Kelly,

I've got a pile of old family black and whites, so I'm scanning at as high a resolution as I'm prepared to pay for storage.  I just upgraded my computer and I'd have to say that the two greatest hardware upgrades for me was the video card, and an SSD.  I can work on GB files with the SSD and not be slowed down, even with an i5 processor.  However, I do have to flatten the images so QTR will read them.  I'm just saving a second file for printing.  If I need the space, I can delete the flattened images and re-flatten them if I ever need to print again.

Thanks again,
Larry
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On Sat, 5/28/16, kellyhealy@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:

 Subject: [QuadtoneRIP] Re: Image preview completely black
 To: QuadtoneRIP@yahoogroups.com
 Received: Saturday, May 28, 2016, 11:25 AM
 
 
  
 
 
 
   
 
 
     
       
       
       Larry It does have to do with file
 size.  I use Tony Kuiper's luminosity masks.  If the
 channels used in the production of the the masks are not
 cleared after the mask is generated the file is very large.
 Also accumulating a big pile of masks will slow thing down
 considerably. Removing the channel's after it is used
 will prevent this.  I'm not sure if  this is how you
 process but that worked for me. 
 Best Kelly
 
     
      
 
     
     
 
 
 
 #yiv1514029518 #yiv1514029518 --