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Re: [hylafax-users] Receiving a color fax



Blas Rodriguez Somoza wrote:

First I update libtiff and libjpeg with libtiff-3.7.4 and libjpeg-6b-36 patched. (using rpm)


I don't understand what you're saying here by the "using rpm" part. Did you get libjpeg source code (SRPM), patch it, build it, install it. Then did you get libtiff source code (SRPM), patch it, build it, and then install it. And then did you subsequently build and install HylaFAX?

Were you following the instructions here: ?

http://hylafax.sourceforge.net/howto/install.php#ss2.5

Then I modify the config.ttySL0, adding Class1JPEGColorSupport: yes.

After that I'm able to receive a JPEG color fax and forward it to an email account.

I try using tif and pdf format, but I can't open the attachment.


You're probably not to this point yet, but when you get here... realize that the TIFF will (originally) have image data encoded with a CIELAB color pallate. I don't think that you're going to have a TIFF viewer that will represent the colors properly. So in FaxDispatch, if you're going to send a TIFF image on to the recipient, you'll want to convert it first with tiffcp to an RGB pallate or something that your TIFF viewer will understand.

Similarly, most PDF viewers are not going to be able to make sense of the color pallate, either. So when you use libtiff's tiff2pdf to convert the CIELAB JPEG TIFF into PDF (which basically just is replaces the TIFF wrapper with a PDF one) you'll find the colors don't come out right. That's why you'll want to use HylaFAX's tiff2pdf script in the case of color faxes instead of libtiff's... because libtiff's tiff2ps utility (which is used by HylaFAX's tiff2pdf with Ghostscript's ps2pdf) will convert the CIELAB colors into RGB first.

Yes, it is not straight-forward... unfortunately. The ITU made it this way by using an uncommon (basically fax-specific) color pallate.

DataFormat: 2-D Uncompressed Mode


My guess is that it says this because your libtiff isn't patched properly yet.

Lee.


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