Index: trunk/doc/conf/tree/editor.html
===================================================================
--- trunk/doc/conf/tree/editor.html	(revision 7532)
+++ trunk/doc/conf/tree/editor.html	(revision 7533)
@@ -44,6 +44,8 @@
 <tr><td> name_on_pcb <td><a href="CFN_BOOLEAN.html"> boolean </a><td> 0 <td> display Reference Designator as element name, instead of value
 <tr><td> fullscreen <td><a href="CFN_BOOLEAN.html"> boolean </a><td> 0 <td> hide widgets to make more room for the drawing
 <tr><td> gl <td><a href="CFN_BOOLEAN.html"> boolean </a><td> 0 <td> use GL for drawing where available
+<tr><td> layer_alpha <td><a href="CFN_REAL.html"> real </a><td> 0 <td> alpha value for layer drawing
+<tr><td> drill_alpha <td><a href="CFN_REAL.html"> real </a><td> 0 <td> alpha value for drill drawing
 <tr><td> click_time <td><a href="CFN_INTEGER.html"> integer </a><td> 0 <td> default time for click expiration, in ms
 <tr><td> enable_stroke <td><a href="CFN_BOOLEAN.html"> boolean </a><td> 0 <td> Enable libstroke gestures on middle mouse button when non-zero
 <tr><td> live_routing <td><a href="CFN_BOOLEAN.html"> boolean </a><td> 0 <td> autorouter shows tracks in progress
Index: trunk/src/conf_core.h
===================================================================
--- trunk/src/conf_core.h	(revision 7532)
+++ trunk/src/conf_core.h	(revision 7533)
@@ -57,6 +57,8 @@
 		CFT_BOOLEAN name_on_pcb;           /* display Reference Designator as element name, instead of value */
 		CFT_BOOLEAN fullscreen;            /* hide widgets to make more room for the drawing */
 		CFT_BOOLEAN gl;                    /* use GL for drawing where available */
+		CFT_REAL layer_alpha;			   /* alpha value for layer drawing */
+		CFT_REAL drill_alpha;			   /* alpha value for drill drawing */
 
 		CFT_INTEGER click_time;            /* default time for click expiration, in ms */
 
Index: trunk/src/pcb-conf.lht
===================================================================
--- trunk/src/pcb-conf.lht	(revision 7532)
+++ trunk/src/pcb-conf.lht	(revision 7533)
@@ -81,6 +81,8 @@
 			undo_warning_size = 1024
 			fullscreen = 0
 			gl = 1
+			layer_alpha = 0.7
+			drill_alpha = 0.85
 		} # editor
 
 		ha:rc {
Index: trunk/src_plugins/hid_gtk/gtkhid-gl.c
===================================================================
--- trunk/src_plugins/hid_gtk/gtkhid-gl.c	(revision 7532)
+++ trunk/src_plugins/hid_gtk/gtkhid-gl.c	(revision 7533)
@@ -391,7 +391,7 @@
 		r = gport->offlimits_color.red / 65535.;
 		g = gport->offlimits_color.green / 65535.;
 		b = gport->offlimits_color.blue / 65535.;
-		a = 0.85;
+		a = conf_core.editor.drill_alpha;
 	}
 	else {
 		if (pcb_hid_cache_color(0, gc->colorname, &cval, &cache))
@@ -428,7 +428,7 @@
 		r = cc->red;
 		g = cc->green;
 		b = cc->blue;
-		a = 0.7;
+		a = conf_core.editor.layer_alpha;
 	}
 	if (1) {
 		double maxi, mult;