diff --git a/src/gui/imgview.py b/src/gui/imgview.py
--- a/src/gui/imgview.py
+++ b/src/gui/imgview.py
@@ -5,7 +5,6 @@ from PIL import ImageTk
 import config
 from .resizablecanvas import ResizableCanvas
 from corners import Corners
-from epoint import EPoint
 from grid import Grid
 import imageanalyzer
 
@@ -21,7 +20,6 @@ class ImgView(ResizableCanvas):
 		self._img=None
 		self._tkImg=None
 		self._imgSizeCoef=1
-		self._imgShift=EPoint(0,0)
 
 		self.configure(width=480,height=360)
 		self.bind('<1>',lambda e: self.addCorner(e.x,e.y))
@@ -62,21 +60,20 @@ class ImgView(ResizableCanvas):
 		widthRatio=wo/w
 		heightRatio=ho/h
 		self._imgSizeCoef=max(widthRatio,heightRatio)
-		# shift compensates possible horizontal or vertical empty margins from unmatching aspect ratios
-		self._imgShift=EPoint(wo-w*self._imgSizeCoef,ho-h*self._imgSizeCoef)/2
 
 		self._img=img
+		self.configure(width=wo,height=ho)
 
 	## Stores a grid corner located at x,y coordinates.
 	def addCorner(self,x,y):
 		self._corners.add(x,y)
 		log.debug("click on %d,%d",x,y)
-		log.debug("sizeCoef: %f, shift: %d,%d",self._imgSizeCoef,self._imgShift.x,self._imgShift.y)
+		log.debug("sizeCoef: %f",self._imgSizeCoef)
 		if self._corners.canonizeOrder():
 			# transform corners from show coordinates to real coordinates
 			log.debug(self._corners.corners)
 			self._boardGrid=Grid(self._corners.corners)
-			corners=[(c*self._imgSizeCoef+self._imgShift) for c in self._corners.corners]
+			corners=[(c*self._imgSizeCoef) for c in self._corners.corners]
 			self._parent.sendMsg("setCorners",(corners,))
 
 		self.redraw()