Re: [hylafax-users] "black" faxes in Tiff format that are fine in PDF format

["Brad Stevens" <bstevens@xxxxxxxxx>]

So imagemagick saw them as black as well and then you inverted?  wouldn't that make them all white?  I guess I'm confused now.  I like the idea of running a script to post process them, as of now, I'm having users open them in Adobe and then resaving them which corrects the problem in the Microsoft (MODI) viewer, but its a very manual process.  Anything I can automate would be cool.

 

-Brad

---

From: Brent Davidson [mailto:brent@xxxxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, October 29, 2008 4:26 PM
To: Brad Stevens
Subject: Re: [hylafax-users] "black" faxes in Tiff format that are fine in PDF format

Yep, you are correct.  I had my programs reversed.  It's been awhile since I ran across an inverted image so I had forgotten which one was backwards.

Anyway, what I finally did to fix our images was to write a perl script that runs on our server and walks the directory tree calling imagemagick to determine the percentage of black in each image.  If the percentage is higher than 75% it inverts the image.  It does a pretty good job of reducing our toner usage on printouts.

-Brent

Brad Stevens wrote:

Mine is the opposite...Microsoft's Document images is what I was using,
and it was black.  When I open with irfanview or adobe standard they
looked fine.

-Brad 

-----Original Message-----
From: hylafax-users-bounce@xxxxxxxxxxx
[mailto:hylafax-users-bounce@xxxxxxxxxxx] On Behalf Of Brent Davidson
Sent: Tuesday, October 28, 2008 12:00 PM
To: hylafax-users@xxxxxxxxxxx
Subject: Re: [hylafax-users] "black" faxes in Tiff format that are fine
in PDF format

Lee Howard wrote:
  

(Message body ignored as the subject line seems to contain the 
relevant information...)

Brad,

Your TIFF viewer is the problem... not HylaFAX.  This is evidenced by 
the fact that PDFs are viewable fine.  (Thus the tiff-to-pdf converter
    

has no problem with the TIFF.)

Thanks,

Lee.

    

My company uses TIF format extensively for document archiving.  I know
that we have several volumes of documents that, when viewed with
Microsoft Document imaging appear correctly, but when viewed with
IrfanView appear to be white on black instead of black on white.  
Running them through the "negative" filter in IrfanView makes them view
correctly.  Strangely enough, going back and then viewing them with
Microsoft's document viewer they are still correct.  It's almost like
some TIF viewers are just incorrectly interpreting the color palette in
Group4 TIFs.