Comic Input: Add option to disable conversion to grayscale (black and white)

src/calibre/ebooks/comic/input.py

@@ -171,7 +171,8 @@ class PageProcessor(list):
                 if not self.opts.dont_sharpen:
                     p.MagickSharpenImage(wand, 0.0, 1.0)
 
-                p.MagickSetImageType(wand, p.GrayscaleType)
+                if not self.opts.dont_grayscale:
+                    p.MagickSetImageType(wand, p.GrayscaleType)
 
                 if self.opts.despeckle:
                     p.MagickDespeckleImage(wand)
@@ -310,6 +311,8 @@ class ComicInput(InputFormatPlugin):
                 'you optimal size and look on your device.')),
         OptionRecommendation(name='no_process', recommended_value=False,
               help=_("Apply no processing to the image")),
+        OptionRecommendation(name='dont_grayscale', recommended_value=False,
+            help=_('Do not convert the image to grayscale (black and white)'))
         ])
 
     recommendations = set([

src/calibre/gui2/convert/comic_input.py

@@ -19,7 +19,8 @@ class PluginWidget(Widget, Ui_Form):
         Widget.__init__(self, parent, 'comic_input',
                 ['colors', 'dont_normalize', 'keep_aspect_ratio', 'right2left',
                     'despeckle', 'no_sort', 'no_process', 'landscape',
-                    'dont_sharpen', 'disable_trim', 'wide', 'output_format']
+                    'dont_sharpen', 'disable_trim', 'wide', 'output_format',
+                    'dont_grayscale']
                 )
         self.db, self.book_id = db, book_id
         for x in get_option('output_format').option.choices:

src/calibre/gui2/convert/comic_input.ui

@@ -7,14 +7,14 @@
     <x>0</x>
     <y>0</y>
     <width>599</width>
-    <height>343</height>
+    <height>345</height>
    </rect>
   </property>
   <property name="windowTitle">
    <string>Form</string>
   </property>
   <layout class="QGridLayout" name="gridLayout">
-   <item row="1" column="0">
+   <item row="2" column="0">
     <widget class="QLabel" name="label_3">
      <property name="text">
       <string>&amp;Number of Colors:</string>
@@ -24,83 +24,83 @@
      </property>
     </widget>
    </item>
-   <item row="1" column="1">
+   <item row="2" column="1">
     <widget class="QSpinBox" name="opt_colors">
      <property name="minimum">
       <number>8</number>
      </property>
      <property name="maximum">
-      <number>3200000</number>
+      <number>32000000</number>
      </property>
      <property name="singleStep">
       <number>8</number>
      </property>
     </widget>
    </item>
-   <item row="2" column="0">
+   <item row="3" column="0">
     <widget class="QCheckBox" name="opt_dont_normalize">
      <property name="text">
       <string>Disable &amp;normalize</string>
      </property>
     </widget>
    </item>
-   <item row="3" column="0">
+   <item row="4" column="0">
     <widget class="QCheckBox" name="opt_keep_aspect_ratio">
      <property name="text">
       <string>Keep &amp;aspect ratio</string>
      </property>
     </widget>
    </item>
-   <item row="4" column="0">
+   <item row="5" column="0">
     <widget class="QCheckBox" name="opt_dont_sharpen">
      <property name="text">
       <string>Disable &amp;Sharpening</string>
      </property>
     </widget>
    </item>
-   <item row="5" column="0">
+   <item row="6" column="0">
     <widget class="QCheckBox" name="opt_disable_trim">
      <property name="text">
       <string>Disable &amp;Trimming</string>
      </property>
     </widget>
    </item>
-   <item row="6" column="0">
+   <item row="7" column="0">
     <widget class="QCheckBox" name="opt_wide">
      <property name="text">
       <string>&amp;Wide</string>
      </property>
     </widget>
    </item>
-   <item row="7" column="0">
+   <item row="8" column="0">
     <widget class="QCheckBox" name="opt_landscape">
      <property name="text">
       <string>&amp;Landscape</string>
      </property>
     </widget>
    </item>
-   <item row="8" column="0">
+   <item row="9" column="0">
     <widget class="QCheckBox" name="opt_right2left">
      <property name="text">
       <string>&amp;Right to left</string>
      </property>
     </widget>
    </item>
-   <item row="9" column="0">
+   <item row="10" column="0">
     <widget class="QCheckBox" name="opt_no_sort">
      <property name="text">
       <string>Don't so&amp;rt</string>
      </property>
     </widget>
    </item>
-   <item row="10" column="0">
+   <item row="11" column="0">
     <widget class="QCheckBox" name="opt_despeckle">
      <property name="text">
       <string>De&amp;speckle</string>
      </property>
     </widget>
    </item>
-   <item row="12" column="0">
+   <item row="13" column="0">
     <spacer name="verticalSpacer">
      <property name="orientation">
       <enum>Qt::Vertical</enum>
@@ -120,7 +120,7 @@
      </property>
     </widget>
    </item>
-   <item row="11" column="0">
+   <item row="12" column="0">
     <widget class="QLabel" name="label">
      <property name="text">
       <string>&amp;Output format:</string>
@@ -130,9 +130,16 @@
      </property>
     </widget>
    </item>
-   <item row="11" column="1">
+   <item row="12" column="1">
     <widget class="QComboBox" name="opt_output_format"/>
    </item>
+   <item row="1" column="0">
+    <widget class="QCheckBox" name="opt_dont_grayscale">
+     <property name="text">
+      <string>Disable conversion of images to &amp;black and white</string>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>
@@ -148,8 +155,8 @@
      <y>11</y>
     </hint>
     <hint type="destinationlabel">
-     <x>210</x>
-     <y>44</y>
+     <x>216</x>
+     <y>76</y>
     </hint>
    </hints>
   </connection>
@@ -164,8 +171,8 @@
      <y>17</y>
     </hint>
     <hint type="destinationlabel">
-     <x>371</x>
-     <y>39</y>
+     <x>592</x>
+     <y>76</y>
     </hint>
    </hints>
   </connection>
@@ -180,8 +187,8 @@
      <y>15</y>
     </hint>
     <hint type="destinationlabel">
-     <x>20</x>
-     <y>67</y>
+     <x>26</x>
+     <y>101</y>
     </hint>
    </hints>
   </connection>
@@ -196,8 +203,8 @@
      <y>11</y>
     </hint>
     <hint type="destinationlabel">
-     <x>38</x>
-     <y>98</y>
+     <x>44</x>
+     <y>126</y>
     </hint>
    </hints>
   </connection>
@@ -212,8 +219,8 @@
      <y>12</y>
     </hint>
     <hint type="destinationlabel">
-     <x>110</x>
-     <y>124</y>
+     <x>116</x>
+     <y>151</y>
     </hint>
    </hints>
   </connection>
@@ -224,12 +231,12 @@
    <slot>setDisabled(bool)</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>153</x>
-     <y>5</y>
+     <x>159</x>
+     <y>11</y>
     </hint>
     <hint type="destinationlabel">
-     <x>67</x>
-     <y>155</y>
+     <x>73</x>
+     <y>176</y>
     </hint>
    </hints>
   </connection>
@@ -244,8 +251,8 @@
      <y>13</y>
     </hint>
     <hint type="destinationlabel">
-     <x>84</x>
-     <y>180</y>
+     <x>90</x>
+     <y>201</y>
     </hint>
    </hints>
   </connection>
@@ -292,8 +299,8 @@
      <y>11</y>
     </hint>
     <hint type="destinationlabel">
-     <x>105</x>
-     <y>256</y>
+     <x>111</x>
+     <y>276</y>
     </hint>
    </hints>
   </connection>
@@ -329,5 +336,21 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>opt_no_process</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>opt_dont_grayscale</receiver>
+   <slot>setDisabled(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>229</x>
+     <y>22</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>231</x>
+     <y>36</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
 </ui>

src/calibre/gui2/wizard/__init__.py

@@ -299,6 +299,11 @@ class StanzaPage(QWizardPage, StanzaUI):
         return FinishPage.ID
 
     def commit(self):
+        from calibre.ebooks.conversion.config import load_defaults, save_defaults
+        recs = load_defaults('comic_input')
+        recs['dont_grayscale'] = True
+        save_defaults('comic_input', recs)
+
         p = self.set_port()
         if p is not None:
             from calibre.library import server_config