LibTiff Mailing List

M. MychaL,

M. MychaL wrote:
> i try to use libtiff to open tiff in TBitmap in order to use it with
> TPrinters but i have a problem.

It's best to avoid confusion by mentioning you're using LibTiffDelphi in
the beginning of your mail. Most people here are C minded, and I never
received any indication of intolerance towards Delphi users of LibTiff,
but I guess most subcribers will find it helpfull to be able to identify
Delphi-centered LibTiff users right away. Otherwise, those *c++==--d
weird char generators on this list may be dangling wondering 'What the
hell is TBitmap and TPrinters, anyway?'. ;-)

> How can we get the next page from tiff ? i tried to use this function
> "TIFFSetDirectory(OpenTiff, PageNumber);" but that use a lot of memory
> !! (250MO and even more sometimes on big files)

I'm afraid that's the name of the game, especially if you're using the
RGBA functions on 1bit per pixel images and such... TIFFSetDirectory is
a good one to use.

If you need more conservative memory use, look into the lower-level
access to LibTiff. http://www.remotesensing.org/libtiff/libtiff.html is
a good place to start reading. This type of access does require you to
understand what a strip and tile is, and a plane and all that, and what
tags to query to derive color space indication and such. Thus, you'll
need some TIFF knowledge as well as some extra coding. A good TIFF FAQ
is http://www.awaresystems.be/imaging/tiff/faq.html, and the complete
TIFF specification is offered by Adobe at
http://partners.adobe.com/public/developer/tiff/index.html.

Joris Van Damme
info@awaresystems.be
http://www.awaresystems.be/
Download your free TIFF tag viewer for windows here:
http://www.awaresystems.be/imaging/tiff/astifftagviewer.html


AWARE [SYSTEMS]		Imaging expertise for the Delphi developer
		TIFF and LibTiff Mailing List Archive
	LibTiff Mailing List TIFF and LibTiff Mailing List Archive October 2005 Previous Thread Next Thread Previous by Thread Next by Thread Previous by Date Next by Date Contact The TIFF Mailing List Homepage This list is run by Frank Warmerdam Archive maintained by AWare Systems	Thread 2005.10.06 15:19 "Need help", by M Mychal 2005.10.06 15:46 "Re: Need help", by Joris Van Damme 2005.10.06 15:46 "Re: Need help", by Joris Van Damme M. MychaL, M. MychaL wrote: > i try to use libtiff to open tiff in TBitmap in order to use it with > TPrinters but i have a problem. It's best to avoid confusion by mentioning you're using LibTiffDelphi in the beginning of your mail. Most people here are C minded, and I never received any indication of intolerance towards Delphi users of LibTiff, but I guess most subcribers will find it helpfull to be able to identify Delphi-centered LibTiff users right away. Otherwise, those *c++==--d weird char generators on this list may be dangling wondering 'What the hell is TBitmap and TPrinters, anyway?'. ;-) > How can we get the next page from tiff ? i tried to use this function > "TIFFSetDirectory(OpenTiff, PageNumber);" but that use a lot of memory > !! (250MO and even more sometimes on big files) I'm afraid that's the name of the game, especially if you're using the RGBA functions on 1bit per pixel images and such... TIFFSetDirectory is a good one to use. If you need more conservative memory use, look into the lower-level access to LibTiff. http://www.remotesensing.org/libtiff/libtiff.html is a good place to start reading. This type of access does require you to understand what a strip and tile is, and a plane and all that, and what tags to query to derive color space indication and such. Thus, you'll need some TIFF knowledge as well as some extra coding. A good TIFF FAQ is http://www.awaresystems.be/imaging/tiff/faq.html, and the complete TIFF specification is offered by Adobe at http://partners.adobe.com/public/developer/tiff/index.html. Joris Van Damme info@awaresystems.be http://www.awaresystems.be/ Download your free TIFF tag viewer for windows here: http://www.awaresystems.be/imaging/tiff/astifftagviewer.html

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2005.10.06 15:46 "Re: Need help", by Joris Van Damme