Re: Picture and Fax viewer with tiled TIFFs

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Steve McLellan (sjm_at_fixerlabs.com.NOSPAM)
Date: 03/15/04 

Date: Mon, 15 Mar 2004 17:42:51 -0000

Hi,

Thanks for the response. It's a particular problem with TIFFs that are
tiled; the TIFF spec allows for two main methods of writing; scanline (which
is the most commonly supported) and tiled. Tiling has an advantage for us
(and possibility a necessity) because we need to write enormous images (tens
of thousands of pixels square), and we face memory constraints if we try to
grab huge blocks of continuous memory. Tiling would allow us to get
reasonably small chunks and write them sequentially, whereas scanline
requires us to grab a large amount of memory 00000s of pixels wide and a
couple of hundred pixels deep.

Steve

"gary_g" <badmail@mail.anonymizer.com> wrote in message
news:%234KZlCrCEHA.2052@TK2MSFTNGP11.phx.gbl...
> I scanned some negs on a Mac and saved then as TIF's.
>
> I just now opened them on XP with Picture & Fax Viewer ok, but Paint
doesn't
> work properly.
>
> Gary G
>
> --
>
>
>> > Hi,
> >
> > I'm experimenting with writing TIFF files using libtiff, specifically
> > writing tiled TIFFs. Having written what I presume is a valid tiled TIFF
> > (that opens in Photoshop and on our Mac's email client, amongst other
> > things), neither Picture or Fax Viewer, or Paint, will open the image.
> I've
> > noticed before that Windows isn't able to display EXIF tags attached to
> TIFF
> > files (except about 5 very basic tags), so I'm wondering whether
Windows'
> > TIFF support doesn't fully support the standard or whether there's
> something
> > I'm doing that won't allow Windows to view it correctly, while other
> clients
> > can.
> >
> > Any light that can be shed on this would be much appreciated.
> >
> > Steve
> >
> >
>
>

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