Digital BW, The Print

The tags for the 720 dpi version are

~~~~~~~
SubFileType (1 Long): Zero
ImageWidth (1 Long): 7852
ImageLength (1 Long): 11339
BitsPerSample (3 Short): 8, 8, 8
Compression (1 Short): Uncompressed
Photometric (1 Short): RGB
StripOffsets (199 Long): 8, 1342700, 2685392, 4028084, 5370776,...
SamplesPerPixel (1 Short): 3
RowsPerStrip (1 Short): 57
StripByteCounts (199 Long): 1342692, 1342692, 1342692, 1342692,
1342692,...
XResolution (1 Rational): 720
YResolution (1 Rational): 720
ResolutionUnit (1 Short): Inch
Software (36 ASCII): ImageLib by SkyLine Tools, Inc. TIFF
~~~~~~~

and for the 360dpi version are:

~~~~~~~
SubFileType (1 Long): Zero
ImageWidth (1 Long): 3926
ImageLength (1 Long): 5669
BitsPerSample (3 Short): 8, 8, 8
Compression (1 Short): Uncompressed
Photometric (1 Short): RGB
StripOffsets (196 Long): 8, 341570, 683132, 1024694, 1366256,...
SamplesPerPixel (1 Short): 3
RowsPerStrip (1 Short): 29
StripByteCounts (196 Long): 341562, 341562, 341562, 341562, 341562,...
XResolution (1 Rational): 360
YResolution (1 Rational): 360
ResolutionUnit (1 Short): Inch
Software (36 ASCII): ImageLib by SkyLine Tools, Inc. TIFF
~~~~~~~

I can't see anything fundamentally different between the two of them,
other than DPI.  I ommitted to say in my previous post that I had
opened the image in PSCS to check the size and resolution, and the
720dpi version seemed alright.

This morning I tried again.  I first tried to open the 720 DPI version
in QTRGui using "Image | Select Image ..." , and I got an "invalid
floating point operation" error message.  (Monitoring was turned
off.) 

I then turned monitoring on and moved the image into the monitored
directory, and lo and behold, it printed.  

So I tried again using "Image | Select Image ...", and this time
rather than the floating point error, I got the same message as last
night - "Image does not fit", with the pixel size interpreted as
inches.

I then opened the 360dpi version (to "clear" QTRGui of the 720dpi
version) and then reopened the 720dpi version again using "Image |
Select Image ...".  The floating point error returned.

This is roughly what happened last time.  At the initial attempt
nothing I could do (closing other programs, various ways of getting
QTRGui to find the image, rebooting) could get QTRGui to correctly
read the size parameters.  Then a day or so later it worked.  Also the
nature of the problem seems to vary, with seemingly the same sequence
of steps producing different errors.

F_P


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Stephen Billard"
<stephen@s...> wrote:
> Please download the TIFF tag viewer from
> http://www.awaresystems.be/imaging/tiff/astifftagviewer.html. 
> 
> This software will let you see what the TIFF tags of the image file
say.
> 
> My guess it that the image does not have a correct RESOLUTIONUNIT
value.
> 
> Anyway, tell me what the values of:
> 
> RESOLUTIONUNIT, IMAGEWIDTH, IMAGELENGTH, XRESOLUTION, and
YRESOLUTION are.
> 
> -Stephen
>  www.sbillard.org/Stephen
> 
> 
> > -----Original Message-----
> > From: ferdinand_paris [mailto:ferdinand_paris@y...] 
> > Sent: Sunday, March 27, 2005 2:28 PM
> > To: DigitalBlackandWhiteThePrint@yahoogroups.com
> > Subject: Re: [Digital BW] QTR(Gui) bug - A3 paper, 720ppi
> > 
> > 
> > 
> > 
> > Stephen
> > 
> > This problem has come back.  Because it's on A3 at 720dpi, 
> > the image that I'm trying to print is 267Mb, and too large to 
> > send you.  
> > 
> > What I'd doing, is printing an image which is 277x400mm on A3 
> > paper (which is 297x420mm) at 720dpi.  The image has been 
> > output from Qimage.
> > 
> > When I try to open this image (from Qimage) in QTRGui, I am 
> > told that the image doesn't fit.  When I hold the mouse over 
> > the thumbnail in QTRGui, I get "7852x11339 in" for the image
size.  
> > 
> > This looks to me as if it is reading the pixel size and 
> > interpreting it as inches.
> > 
> > If I output *exactly* the same image from Qimage at 360dpi, 
> > and then open this in QTRGui, all appears well.  The 
> > measurements are correct (albeit in inches - 10.906x15.747 in)
> > 
> > I don't get this problem at all when printing on A4.
> > 
> > F_P