diff --git a/ChangeLog b/ChangeLog
index 0622c64a3..0dba1ccd5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,12 +1,12 @@
-2012-02-06 Rolf Bensch <rolf at bensch hyphen online dot de>
-	* backend/pixma_mp150, doc/descriptions/pixma.desc, doc/sane-pixma.man:
-	New scanner Canon PIXMA MX360.
-
-2012-02-03 Rolf Bensch <rolf at bensch hyphen online dot de>
+2012-02-09 Rolf Bensch <rolf at bensch hyphen online dot de>
 	* backend/pixma.[ch], backend/pixma_common.[ch], 
 	backend/pixma_sane_options.[ch], backend/pixma_mp{150,810}.c:
 	1 bit B/W lineart for pixma_mp150 and pixma_810 subdrivers.  
 
+2012-02-06 Rolf Bensch <rolf at bensch hyphen online dot de>
+	* backend/pixma_mp150, doc/descriptions/pixma.desc, doc/sane-pixma.man:
+	New scanner Canon PIXMA MX360.
+
 2012-02-03 Rolf Bensch <rolf at bensch hyphen online dot de>
 	* backend/pixma.h: set PIXMA_VERSION_{MAJOR,MINOR,BUILD} to 0.16.3.
 
diff --git a/backend/pixma_common.c b/backend/pixma_common.c
index ab01ff6a3..cd834cb95 100644
--- a/backend/pixma_common.c
+++ b/backend/pixma_common.c
@@ -343,7 +343,9 @@ pixma_rgb_to_gray (uint8_t * gptr, uint8_t * sptr, unsigned w, unsigned c)
  * @param dst   pointer where to store result
  * @param src   pointer to raw data
  * @param width width of the processed line
- * @param c     3 for 3-channel single-byte data, 6 for double-byte data
+ * @param c     1 for 1-channel single-byte data,
+ *              3 for 3-channel single-byte data,
+ *              6 for double-byte data
  * */
 uint8_t *
 pixma_binarize_line(pixma_scan_param_t * sp, uint8_t * dst, uint8_t * src, unsigned width, unsigned c)
@@ -364,7 +366,8 @@ pixma_binarize_line(pixma_scan_param_t * sp, uint8_t * dst, uint8_t * src, unsig
     }
 
   /* first, color convert to grayscale */
-    pixma_rgb_to_gray(dst, src, width, c);
+    if (c != 1)
+      pixma_rgb_to_gray(dst, src, width, c);
 
   /* second, normalize line */
     min = 255;
diff --git a/backend/pixma_mp150.c b/backend/pixma_mp150.c
index 6a8628608..7366d2495 100644
--- a/backend/pixma_mp150.c
+++ b/backend/pixma_mp150.c
@@ -1055,8 +1055,8 @@ post_process_image_data (pixma_t * s, pixma_imagebuf_t * ib)
           /* Crop line to selected borders */
           memmove(cptr, sptr + cx, cw);
 	  
-          /* Color to Lineart convert for CCD sensor */
-          if (is_ccd_lineart (s))
+          /* Color / Gray to Lineart convert */
+          if (s->param->software_lineart)
               cptr = gptr = pixma_binarize_line (s->param, gptr, cptr, s->param->w, c);
           /* Color to Grayscale convert for CCD sensor */
           else if (is_ccd_grayscale (s))