fix regression for gl646 CCD based scanners

ChangeLog

@@ -1,3 +1,7 @@
+2010-02-25 Stéphane Voltz <stef.dev at free.fr>
+	* backend/genesys_gl646.c: fix regression for gl646 CCD scanners due
+	to incorrect color filter setting.
+
 2010-02-23 Stéphane Voltz <stef.dev at free.fr>
 	* backend/genesys.c backend/genesys_devices.c backend/genesys_gl646.c
 	backend/genesys_gl646.h: XP200 calibration rework. Some HP3670

backend/genesys_gl646.c

@@ -3410,7 +3410,7 @@ setup_for_scan (Genesys_Device * dev, Genesys_Settings settings,
 
   /* select color filter based on settings */
   dev->reg[reg_0x04].value &= ~REG04_FILTER;
-  if(channels>1)
+  if(channels==1)
     {
       switch (settings.color_filter)
 	{