expand on motivation for this project

diff --git a/README b/README
index ab53243..5dcd1ec 100644 (file)
--- a/README
+++ b/README
@@ -7,12 +7,19 @@ DESCRIPTION
     ribbon (K) to provide pixel-exact driver with support for two-side
     printing.
 
-    Existing cups driver available at
+    Existing cups driver is available at
 
     http://www.evolis.com/eng/Drivers-Support/Product-support/Dualys-3
 
-    does work, but I haven't been able to make it print duplex on cards,
-    especially when generating front and back pages separatly.
+    but I haven't been able to make it print on both sides of cards, partly
+    because using dumplex option in cups seems to segfault GhostScript
+    and/or `rastertoevolis' cups filter depending on combination of duplex
+    options.
+
+    I also needed pixel perfect transfer to printer, and cups bitmap format
+    is always in color, leaving final pixel modifications down to cups
+    filter which always produced differences between file sent to printer
+    and perfect black and white rendition of it.
 
 SCRIPTS
     Current toolset consists of following scripts:

diff --git a/lib/Printer/EVOLIS.pm b/lib/Printer/EVOLIS.pm
index fdf5b5d..e1d675e 100644 (file)
--- a/lib/Printer/EVOLIS.pm
+++ b/lib/Printer/EVOLIS.pm
@@ -13,15 +13,22 @@ our $VERSION = '0.01';
 
 =head1 DESCRIPTION
 
-This is experimental support for EVOLIS Dualys 3 printer with black ribbon (K) to provide
-pixel-exact driver with support for two-side printing.
+This is experimental support for EVOLIS Dualys 3 printer with black ribbon (K)
+to provide pixel-exact driver with support for two-side printing.
 
-Existing cups driver available at
+Existing cups driver is available at
 
 L<http://www.evolis.com/eng/Drivers-Support/Product-support/Dualys-3>
 
-does work, but I haven't been able to make it print duplex on cards, especially when generating
-front and back pages separatly.
+but I haven't been able to make it print on both sides of cards,
+partly because using dumplex option in cups seems to segfault GhostScript
+and/or C<rastertoevolis> cups filter depending on combination of duplex
+options.
+
+I also needed pixel perfect transfer to printer, and cups
+bitmap format is always in color, leaving final pixel modifications down
+to cups filter which always produced differences between file sent to
+printer and perfect black and white rendition of it.
 
 =head1 SCRIPTS