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Rick Cone,Secure Payment Systems wrote:
> I have a several JPEG images that I want to send as a fax using efax 
> (efix).
>  
> Seems I need to convert the JPEG's to TIFF.
>  
> Does anybody know of a good convert tool, or perhaps a better method 
> when using efax?

efax doesn't support color faxing, and so I assume, therefore, that 
you're taking some kind of (color) JPEG and turning it into monochrome 
"fax" (MH, MR, MMR) data in a TIFF.

This will, therefore, involve some kind of dithering process in order to 
change the colors into a representative pattern of black dots on a white 
background.

There is a "jpeg2ps" tool out there by Thomas Merz (I use 1.9).  You can 
then take that Postscript output and feed it through Ghostscript to one 
of its TIFF drivers to create a TIFF.

However, I find the default dithering in Ghostscript to be poor.  You 
can improve it by involving Ghostscript's stocht.ps to do the dithering, 
however, my preferred method is to involve libtiff's own tiff2bw and 
tiffdither tools for Floyd-Steinberg dithering.

If you're not needing to automate it, I certainly would advise using a 
GUI tool and visually inspect the dithering before faxing.

Thanks,

Lee.


AWARE [SYSTEMS]		Imaging expertise for the Delphi developer
		TIFF and LibTiff Mailing List Archive
	LibTiff Mailing List TIFF and LibTiff Mailing List Archive December 2008 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 2008.12.13 00:57 "Converting JPEG to TIFF to use EFAX", by Secure Payment Systems Rick Cone 2008.12.13 01:41 "Re: Converting JPEG to TIFF to use EFAX", by Bob Friesenhahn 2008.12.16 22:49 "Re: Converting JPEG to TIFF to use EFAX", by Lee Howard 2008.12.16 22:49 "Re: Converting JPEG to TIFF to use EFAX", by Lee Howard Rick Cone,Secure Payment Systems wrote: > I have a several JPEG images that I want to send as a fax using efax > (efix). > > Seems I need to convert the JPEG's to TIFF. > > Does anybody know of a good convert tool, or perhaps a better method > when using efax? efax doesn't support color faxing, and so I assume, therefore, that you're taking some kind of (color) JPEG and turning it into monochrome "fax" (MH, MR, MMR) data in a TIFF. This will, therefore, involve some kind of dithering process in order to change the colors into a representative pattern of black dots on a white background. There is a "jpeg2ps" tool out there by Thomas Merz (I use 1.9). You can then take that Postscript output and feed it through Ghostscript to one of its TIFF drivers to create a TIFF. However, I find the default dithering in Ghostscript to be poor. You can improve it by involving Ghostscript's stocht.ps to do the dithering, however, my preferred method is to involve libtiff's own tiff2bw and tiffdither tools for Floyd-Steinberg dithering. If you're not needing to automate it, I certainly would advise using a GUI tool and visually inspect the dithering before faxing. Thanks, Lee.

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2008.12.16 22:49 "Re: Converting JPEG to TIFF to use EFAX", by Lee Howard