diff --git a/kcc/comic2ebook.py b/kcc/comic2ebook.py
index 44b218e..1770a2c 100755
--- a/kcc/comic2ebook.py
+++ b/kcc/comic2ebook.py
@@ -297,7 +297,7 @@ def applyImgOptimization(img, isSplit=False, toRight=False):
     img.resizeImage(options.upscale, options.stretch, options.black_borders, isSplit, toRight, options.landscapemode,
                     options.nopanelviewhq)
     img.optimizeImage(options.gamma)
-    if not options.notquantize:
+    if options.forcepng:
         img.quantizeImage()
 
 
@@ -337,17 +337,17 @@ def dirImgProcess(path):
                         facing = "left"
                     img0 = image.ComicPage(split[0], options.profile)
                     applyImgOptimization(img0, True, toRight1)
-                    img0.saveToDir(dirpath, options.notquantize)
+                    img0.saveToDir(dirpath, options.forcepng)
                     img1 = image.ComicPage(split[1], options.profile)
                     applyImgOptimization(img1, True, toRight2)
-                    img1.saveToDir(dirpath, options.notquantize)
+                    img1.saveToDir(dirpath, options.forcepng)
                 else:
                     if facing == "right":
                         facing = "left"
                     else:
                         facing = "right"
                     applyImgOptimization(img)
-                    img.saveToDir(dirpath, options.notquantize)
+                    img.saveToDir(dirpath, options.forcepng)
 
 
 def genEpubStruct(path):
@@ -560,8 +560,8 @@ def main(argv=None):
                       help="Disable high quality Panel View [Default=False]")
     parser.add_option("--noprocessing", action="store_false", dest="imgproc", default=True,
                       help="Do not apply image preprocessing (Page splitting and optimizations) [Default=True]")
-    parser.add_option("--nodithering", action="store_true", dest="notquantize", default=False,
-                      help="Disable image quantization [Default=False]")
+    parser.add_option("--forcepng", action="store_true", dest="forcepng", default=False,
+                      help="Create PNG files instead JPEG (For non-Kindle devices) [Default=False]")
     parser.add_option("--gamma", type="float", dest="gamma", default="0.0",
                       help="Apply gamma correction to linearize the image [Default=Auto]")
     parser.add_option("--upscale", action="store_true", dest="upscale", default=False,
diff --git a/kcc/gui.py b/kcc/gui.py
index bc790c1..d00c1b2 100644
--- a/kcc/gui.py
+++ b/kcc/gui.py
@@ -96,7 +96,7 @@ class MainWindow:
             'Bmangastyle': IntVar(None, 0),
             'Cnopanelviewhq': IntVar(None, 0),
             'Dimage_preprocess': IntVar(None, 0),
-            'Enotquantize': IntVar(None, 0),
+            'Eforcepng': IntVar(None, 0),
             'Fimage_gamma': DoubleVar(None, 0.0),
             'Gimage_upscale': IntVar(None, 0),
             'Himage_stretch': IntVar(None, 0),
@@ -110,7 +110,7 @@ class MainWindow:
             'Bmangastyle': "Manga mode",
             'Cnopanelviewhq': "Disable high quality Panel View",
             'Dimage_preprocess': "Disable image optimizations",
-            'Enotquantize': "Disable image quantization",
+            'Eforcepng': "Create PNG files instead JPEG",
             'Fimage_gamma': "Custom gamma correction",
             'Gimage_upscale': "Allow image upscaling",
             'Himage_stretch': "Stretch images",
@@ -168,8 +168,8 @@ class MainWindow:
             argv.append("--nopanelviewhq")
         if self.options['Dimage_preprocess'].get() == 1:
             argv.append("--noprocessing")
-        if self.options['Enotquantize'].get() == 1:
-            argv.append("--nodithering")
+        if self.options['Eforcepng'].get() == 1:
+            argv.append("--forcepng")
         if self.options['Fimage_gamma'].get() != 0.0:
             argv.append("--gamma")
             argv.append(self.options['Fimage_gamma'].get())
diff --git a/kcc/image.py b/kcc/image.py
index 743c124..3876650 100755
--- a/kcc/image.py
+++ b/kcc/image.py
@@ -113,15 +113,15 @@ class ComicPage:
             raise RuntimeError('Cannot read image file %s' % source)
         self.image = self.image.convert('RGB')
 
-    def saveToDir(self, targetdir, notquantize):
+    def saveToDir(self, targetdir, forcepng):
         filename = os.path.basename(self.origFileName)
         try:
             self.image = self.image.convert('L')    # convert to grayscale
             os.remove(os.path.join(targetdir, filename))
-            if notquantize:
-                self.image.save(os.path.join(targetdir, os.path.splitext(filename)[0] + ".jpg"), "JPEG")
-            else:
+            if forcepng:
                 self.image.save(os.path.join(targetdir, os.path.splitext(filename)[0] + ".png"), "PNG")
+            else:
+                self.image.save(os.path.join(targetdir, os.path.splitext(filename)[0] + ".jpg"), "JPEG")
         except IOError as e:
             raise RuntimeError('Cannot write image in directory %s: %s' % (targetdir, e))