Corrected source filename with sframe if provided

src/main.c

@@ -265,7 +265,12 @@ int  main(int argc, char *argv[])
 
         NPRINTF(stderr, "COMP: images of the sources\n");
         if (M.pixel == 1)
-            e_pixel(M.npixel, M.pixelfile, "source.fits", source);
+	{
+	    if(strcmp(ps.pixfile, "")) 
+		    e_pixel(M.npixel, M.pixelfile, ps.pixfile, source);
+	    else 
+                    e_pixel(M.npixel, M.pixelfile, "source.fits", source);
+	}
 
         if (M.pixel < 2)
         {