LibTiff Mailing List

On Thu, 20 Jan 2005 09:19:59 +0200, Frans Dames wrote:
> I am extracting tif data 8 bits/sample colour pixels.
> It seems that each pixel contains 8bits of colour information.
> If I open the tif in Paintshop Pro I can see that it consist of a 256
> colour palette.
> How do n convert this to a 24 bit RGB value for display?

Frans,

You can use the tiff2rgba command line utiilty which actually writes
a 32bit (Red, green, blue, alpha) TIFF file.  Use the -n flag if you don't
want it emitting alpha values. 

Programmatically you an use the TIFFReadRGBAImage() function. 

> Disclaimer:  The information contained in this communication is
> confidential and may be legally privileged.

I have no doubt this disclaimer is forced on you by legal "suits" in your 
organization, but frankly it is ludicrious to think that your communication 
to a public mailing list could remain in anyway legally confidential.  For 
that matter, if you email me personally, and I have not already signed 
an NDA you are entirely dependent on my good will to retain your
confidentiality.

I hate these stupid disclaimers.  However, I would respectfully ask all list
members not to turn this into a thread on disclaimers (unless you can artfully
also think up useful things to say about the TIFF related part of the email
message).  In fact, I suppose I should just have avoided this rant.  But you
know how it is.  Sometimes it is hard to hold the rant in.  :-)

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent


AWARE [SYSTEMS]		Imaging expertise for the Delphi developer
		TIFF and LibTiff Mailing List Archive
	LibTiff Mailing List TIFF and LibTiff Mailing List Archive January 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 2005.01.20 07:19 "8 bits per sample", by Frans Dames 2005.01.21 21:13 "Re: 8 bits per sample", by Frank Warmerdam 2005.01.21 21:13 "Re: 8 bits per sample", by Frank Warmerdam On Thu, 20 Jan 2005 09:19:59 +0200, Frans Dames wrote: > I am extracting tif data 8 bits/sample colour pixels. > It seems that each pixel contains 8bits of colour information. > If I open the tif in Paintshop Pro I can see that it consist of a 256 > colour palette. > How do n convert this to a 24 bit RGB value for display? Frans, You can use the tiff2rgba command line utiilty which actually writes a 32bit (Red, green, blue, alpha) TIFF file. Use the -n flag if you don't want it emitting alpha values. Programmatically you an use the TIFFReadRGBAImage() function. > Disclaimer: The information contained in this communication is > confidential and may be legally privileged. I have no doubt this disclaimer is forced on you by legal "suits" in your organization, but frankly it is ludicrious to think that your communication to a public mailing list could remain in anyway legally confidential. For that matter, if you email me personally, and I have not already signed an NDA you are entirely dependent on my good will to retain your confidentiality. I hate these stupid disclaimers. However, I would respectfully ask all list members not to turn this into a thread on disclaimers (unless you can artfully also think up useful things to say about the TIFF related part of the email message). In fact, I suppose I should just have avoided this rant. But you know how it is. Sometimes it is hard to hold the rant in. :-) Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up \| Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows \| http://pobox.com/~warmerdam and watch the world go round - Rush \| Geospatial Programmer for Rent

LibTiff Mailing List

Thread

2005.01.21 21:13 "Re: 8 bits per sample", by Frank Warmerdam