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Optimize Fax Conversion Quality

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Added additional command line switches to the Ghostscript command which greatly improves the output quality and legibility of converted faxes.

Now using a simple threshold method - 75% threshold to determine if a pixel will be black or white.
Dithering is turned off completely.
Also switched to newer tiffg4 compression method.
This commit is contained in:
emaktech
2020-11-17 16:00:23 -05:00
committed by GitHub
parent aa87250196
commit 5d3b2d3226
1 changed files with 2 additions and 5 deletions
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7
app/fax/fax_send.php
View File

@@ -25,6 +25,7 @@
James Rose <james.o.rose@gmail.com>
Luis Daniel Lucio Quiroz <dlucio@okay.com.mx>
Errol Samuels <voiptology@gmail.com>
Corey Moullas <cmoullas@emak.tech>
*/
if (!isset($included)) { $included = false; }
@@ -396,12 +397,8 @@ if (!function_exists('fax_split_dtmf')) {
if (file_exists($dir_fax_temp.'/'.$fax_name.'.pdf')) {
chdir($dir_fax_temp);
//$cmd = gs_cmd("-q -sDEVICE=psmono -r".$gs_r." -g".$gs_g." -dNOPAUSE -dBATCH -dSAFER -sOutputFile=".correct_path($fax_name).".pdf -- ".correct_path($fax_name).".pdf -c quit");
// echo($cmd . "<br/>\n");
//exec($cmd);
//convert pdf to tif
$cmd = gs_cmd("-q -sDEVICE=tiffg32d -r".$gs_r." -g".$gs_g." -dBATCH -dPDFFitPage -dNOPAUSE -sOutputFile=".correct_path($fax_name).".tif -- ".correct_path($fax_name).".pdf -c quit");
$cmd = gs_cmd("-q -r".$gs_r." -g".$gs_g." -dBATCH -dPDFFitPage -dSAFER -dNOPAUSE -dBATCH -sOutputFile=".correct_path($fax_name).".tif -sDEVICE=tiffg4 -Ilib stocht.ps -c \"{ .75 gt { 1 } { 0 } ifelse} settransfer\" -- ".correct_path($fax_name).".pdf -c quit");
// echo($cmd . "<br/>\n");
exec($cmd);
@unlink($dir_fax_temp.'/'.$fax_name.'.pdf');