From: leonardr@pdfsages.com (Leonard Rosenthol)
Date: Fri, 21 Nov 2003 16:25:47 -0500
Subject: [Tiff] tiff2pdf contribution
In-Reply-To: <200311211710.hALHAF6l022448@whale2.fsr.net>
References: <200311211710.hALHAF6l022448@whale2.fsr.net>
Message-ID: <p06010215bbe432a7d833@[10.36.20.110]>

At 9:21 AM -0800 11/21/03, Finlayson, Ross wrote:
>If you could explain the /Rotate field that would be good.  I think 
>there should be different rotate flags for view and print.

	It tells a PDF renderer what degree to rotate the content. 
Some renderers due this as a pre-transform on the contents, so do a 
post -rasterization rotation, etc.   Doesn't matter - but it DOES 
effect all rendering as per the spec.

	If you want something different for view vs. print, then 
you'd want to avoid /Rotate and use PDF 1.5 optional content and 
CTM's.


>The /Rotate would be sufficient for rotating the page, but there are 
>also the four more options to flip or mirror the page.

	Not as far as PDF is concerned.   /Rotate is there to simply 
allow people (or software) to fix landscape pages that were done as 
portrait (or vice versa).

	Those functions are handled by CTM...


>I've implemented it but it doesn't work right on tiled images with 
>TIFF orientation > 4.  I have here a tiled JPEG that has orientation 
>4 and each row is flipped.  I'm wondering in what ways people 
>implemented TIFF orientation with tiled images.

	Using CTM is the best way...


Leonard
-- 
---------------------------------------------------------------------------
Leonard Rosenthol                            <mailto:leonardr@pdfsages.com>
Chief Technical Officer                      <http://www.pdfsages.com>
PDF Sages, Inc.                              215-629-3700 (voice)
                                              215-629-0789 (fax)

