add no quantize option (#1269)

README.md

@@ -272,6 +272,7 @@ PROCESSING:
   --coverfill           Center-crop only the cover to fill target device screen
   --forcecolor          Don't convert images to grayscale
   --forcepng            Create PNG files instead JPEG
+  --noquantize          Don't quantize PNG images to 16 colors
   --mozjpeg             Create JPEG files using mozJpeg
   --jpeg-quality        The JPEG quality, on a scale from 0 (worst) to 95 (best). Default 85 for most devices.
   --maximizestrips      Turn 1x4 strips to 2x2 strips

gui/KCC.ui

@@ -929,6 +929,20 @@ Higher values are larger and higher quality, and may resolve blank page issues.<
          </property>
         </widget>
        </item>
+       <item row="10" column="2">
+        <widget class="QCheckBox" name="noQuantizeBox">
+         <property name="toolTip">
+          <string>Don't quantize PNG images to 16 colors (4 bit)
+
+This will double file size but preserve all 256 colors (8 bit).
+
+Eink only has 16 shades of gray so you probably don't want this.</string>
+         </property>
+         <property name="text">
+          <string>No Quantize</string>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
     </item>

kindlecomicconverter/KCC_gui.py

@@ -353,6 +353,8 @@ class WorkerThread(QThread):
             options.forcepng = True
         elif GUI.mozJpegBox.checkState() == Qt.CheckState.Checked:
             options.mozjpeg = True
+        if GUI.noQuantizeBox.isChecked():
+            options.noquantize = True
         if GUI.jpegQualityBox.isChecked():
             options.jpegquality = GUI.jpegQualitySpinBox.value()
         if GUI.currentMode > 2:
@@ -1045,6 +1047,7 @@ class KCCGUI(KCC_ui.Ui_mainWindow):
                                            'coverFillBox': GUI.coverFillBox.checkState(),
                                            'metadataTitleBox': GUI.metadataTitleBox.checkState(),
                                            'mozJpegBox': GUI.mozJpegBox.checkState(),
+                                           'noQuantizeBox': GUI.noQuantizeBox.checkState(),
                                            'jpegQualityBox': GUI.jpegQualityBox.checkState(),
                                            'jpegQuality': GUI.jpegQualitySpinBox.value(),
                                            'widthBox': GUI.widthBox.value(),

kindlecomicconverter/KCC_ui.py

@@ -477,6 +477,11 @@ class Ui_mainWindow(object):
 
         self.gridLayout_2.addWidget(self.rotateRightBox, 10, 1, 1, 1)
 
+        self.noQuantizeBox = QCheckBox(self.optionWidget)
+        self.noQuantizeBox.setObjectName(u"noQuantizeBox")
+
+        self.gridLayout_2.addWidget(self.noQuantizeBox, 10, 2, 1, 1)
+
 
         self.gridLayout.addWidget(self.optionWidget, 5, 0, 1, 2)
 
@@ -764,6 +769,14 @@ class Ui_mainWindow(object):
         self.rotateRightBox.setToolTip(QCoreApplication.translate("mainWindow", u"Rotate 2 page spreads in opposite direction than normal.", None))
 #endif // QT_CONFIG(tooltip)
         self.rotateRightBox.setText(QCoreApplication.translate("mainWindow", u"Rotate Right", None))
+#if QT_CONFIG(tooltip)
+        self.noQuantizeBox.setToolTip(QCoreApplication.translate("mainWindow", u"Don't quantize PNG images to 16 colors (4 bit)\n"
+"\n"
+"This will double file size but preserve all 256 colors (8 bit).\n"
+"\n"
+"Eink only has 16 shades of gray so you probably don't want this.", None))
+#endif // QT_CONFIG(tooltip)
+        self.noQuantizeBox.setText(QCoreApplication.translate("mainWindow", u"No Quantize", None))
         self.gammaLabel.setText(QCoreApplication.translate("mainWindow", u"Gamma: Auto", None))
         self.jpegQualityLabel.setText(QCoreApplication.translate("mainWindow", u"JPEG Quality:", None))
     # retranslateUi

kindlecomicconverter/comic2ebook.py

@@ -707,7 +707,8 @@ def imgFileProcessing(work):
                 pass
             elif opt.forcepng:
                 img.convertToGrayscale()
-                img.quantizeImage()
+                if not opt.noquantize:
+                    img.quantizeImage()
                 if opt.format == 'PDF':
                     img.convertToGrayscale()
                 elif opt.profile == 'KDX' and opt.format == 'CBZ':
@@ -1403,6 +1404,8 @@ def makeParser():
                                 help="Erase rainbow effect on color eink screen by attenuating interfering frequencies")
     processing_options.add_argument("--forcepng", action="store_true", dest="forcepng", default=False,
                                     help="Create PNG files instead JPEG")
+    processing_options.add_argument("--noquantize", action="store_true", dest="noquantize", default=False,
+                                    help="Don't quantize to 16 color PNG")
     processing_options.add_argument("--mozjpeg", action="store_true", dest="mozjpeg", default=False,
                                     help="Create JPEG files using mozJpeg")
     processing_options.add_argument("--jpeg-quality", type=int, dest="jpegquality",