Image to Sketch Converter App Using Python || OpenCV + PyQt5

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Hi Guys! Today in this blog, we're going to talk about Image to Sketch Convertion using Python Programming Language. So let's go into dip of it. 

Project Requirements
  • Python 3.x (python.org)
  • PyQt5 (pip install pyqt5)
  • OpenCV (pip install opencv-python)
  • Numpy (pip install numpy)
  • And off course a little bit of your knowledge in python programming language 😄
    •

    Project Files Hiararchy
    Image2Sketch
     │ main.py
     │ ImgDDLabel.py
     │ sketcher.py
     │ window.ui
     │ 
     └───Sketches
                     sketch-04-09-22-13-52-11.png
                     sketch-04-09-22-13-53-15.png

    Python file - main.py is the main file or app module which you have to run.

    Open any Python IDE like visual studio, Pycharm, Spider, Annaconda or my favourite Google Colab.

    you can also use Python IDLE for lightweight use.

    After opening your desired IDE, open main.py into it and run.

    main.py Code will look like this:

    main.py

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    # import the necessary packages
from PyQt5 import QtCore, QtGui, QtWidgets, uic
from ImgDDLabel import ImgDDLabel
from sketcher import Sketcher, webcam

# -----------------------------------------------------------
class ImageToSketch:
    def __init__(self):
        self.img = None
        self.sketch = None
        self.main()

    def main(self):
        try:

            app = QtWidgets.QApplication(sys.argv)
            self.ui = uic.loadUi("window.ui")

            self.original = ImgDDLabel()  # drag-drop Label Widget
            ##            self.sketchLabel = QtWidgets.QLabel() #label to show sketch
            self.ui.layout2.addWidget(self.original)
            ##            self.ui.layout2.addWidget(self.sketchLabel)
            self.ui.convertBtn.clicked.connect(
                self.convert
            )  # this check_btn is made in ui file. open ui file in Qt Designer to see this xml file
            self.ui.camBtn.clicked.connect(webcam)
            self.ui.show()
            app.exec_()
        except Exception as e:
            print(e)

    def convert(self):

        try:
            print("converting to sketch...")
            self.img = self.original.imagefile

            if self.img:
                Sketcher(self.img)
                ##                self.sketch = Sketcher(self.img)
                ##                self.sketch =  QtGui.QImage(self.sketch, self.sketch.shape[1], self.sketch.shape[0], QtGui.QImage.Format_BGR888)
                ##
                ##                # load and display image
                ##                try:
                ##
                ##                    self.sketch = QtGui.QPixmap(self.sketch)
                ##                    self.sketch = self.sketch.scaled(QtCore.QSize(self.sketchLabel.width(),
                ##                                                         self.sketchLabel.height()),
                ##                                                   QtCore.Qt.KeepAspectRatio,
                ##                                                   QtCore.Qt.SmoothTransformation)
                ##                    self.sketchLabel.setPixmap(self.sketch)

                ##                except Exception as e:print(e)

                msg = QtWidgets.QMessageBox()
                msg.setIcon(QtWidgets.QMessageBox.Information)
                msg.setText("Convertion Complete")
                msg.setWindowTitle("Info")
                msg.exec_()

            else:
                msg = QtWidgets.QMessageBox()
                msg.setIcon(QtWidgets.QMessageBox.Information)
                msg.setText("Error in Sketching\n Please select any image to Sketch.")
                msg.setWindowTitle("Error")
                msg.exec_()

        except Exception as e:
            msg = QtWidgets.QMessageBox()
            msg.setIcon(QtWidgets.QMessageBox.Error)
            msg.setText("Convertion Incomplete")
            msg.setInformativeText(str(e))
            msg.setWindowTitle("Error")
            msg.exec_()
            print(e)


if __name__ == "__main__":
    import sys
    ImageToSketch()

    After opening, A window will open like this:

    GUI Screen Screenshot

    There are another two python files called

    • ImgDDLabel.py
    • sketcher.py
    Their Codes are down below respectively.

    ImgDDLabel.py
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    from PyQt5 import QtCore, QtGui, QtWidgets,uic

class ImgDDLabel(QtWidgets.QLabel):
    def __init__(self,lineedit=None):
        super().__init__()
        self.setAcceptDrops(True)
        self.lineedit = lineedit
        self.imagefile = None
        # set center alignment of image label
        self.setAlignment(QtCore.Qt.AlignCenter)
        # set text on image label
        self.setText("Drag your Image here.")
        # set the label style
        self.setStyleSheet('''background-color: rgb(255, 255, 255);
color: rgb(39, 86, 115);
border-radius:10px;
font: 75 9pt "MS Shell Dlg 2";
''')
    def dragEnterEvent(self, event):
        # check if the event has image or not
        if event.mimeData().hasImage:
            # if event has image then
            # accept the event to drag
            event.accept()
        else:
            # if event doesn't have image
            # then ignore the event to drag
            event.ignore()
    
    def dropEvent(self, event):
        # check if the event has image or not
        if event.mimeData().hasImage:
            # set drop action with copying dragged image
            event.setDropAction(QtCore.Qt.CopyAction)
            # get selected image path
            image_path = event.mimeData().urls()[0].toLocalFile()
            self.imagefile = image_path
            # call set_image() function to load
            # image with image path parameter
            self.set_image(image_path)
            # if event has image then
            # accept the event to drop
            event.accept()
        else:
            # if event doesn't have image
            # then ignore the event to drop
            event.ignore()
            
    def mouseDoubleClickEvent(self, event):
        print("mouseDoubleClickEvent triggered.")
        try:
            fname = QtWidgets.QFileDialog.getOpenFileName(self, 'Select Image to Sketch', 
                '.',"Image Files (*.png *.bmp *.jpg)")
            if fname:
                self.imagefile = fname[0]
                self.set_image(self.imagefile)
        except Exception as e:print(e)
        
    def set_image(self, image_path):
        # load and display image
        try:
            
            image_path = QtGui.QPixmap(image_path)
            image_path = image_path.scaled(QtCore.QSize(self.width(),
                                                 self.height()),
                                           QtCore.Qt.KeepAspectRatio,
                                           QtCore.Qt.SmoothTransformation)
            self.setPixmap(image_path)
            
        except Exception as e:print(e)

if __name__ == "__main__":
    import sys
    print('running')
    try:
        
        app = QtWidgets.QApplication(sys.argv)
        ui = uic.loadUi('window.ui')
        
        imgddlabel = ImgDDLabel()#Label
        ui.l1.addWidget(imgddlabel)
        ui.show()
        app.exec_()
    except Exception as e:print(e)
    print('running finished')
    Above codes under module are responsible for Image drag and drop feature in the project.
    If You want to learn about Image drag and drop feature in python Read this blog

    the next  python file code is down below:

    sketcher.py
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    #...........Convert image to pencil sketch......!

import cv2
import numpy
import time
import traceback
def webcam():
    stname = 'CID An Education Hub'
    video_capture = cv2.VideoCapture(0)
    while True:
        ret, frame = video_capture.read(0)

        cv2.putText(frame, "Image2Sketch By: {}".format(stname), (430, 30),
                    cv2.FONT_HERSHEY_SIMPLEX, 0.3, (0, 0, 255), 1)
 
        # show the frame
        cv2.imshow("Webcam", frame)

        # if the `q` key was pressed, break from the loop
        if cv2.waitKey(1) == ord('q'):
                break
        elif cv2.waitKey(1) == ord('c'):
            print('sketching')
            print(type(frame))
            Sketcher(frame=frame)
            
    # do a bit of cleanup
    video_capture.release()
##    cv2.destroyAllWindows()

        
def Sketcher(img=None,frame=None):
    try:
        if img:
            print('sketching from img')
            #specify the path to image (Loading image image)
            image = cv2.imread(img)
            # convert the image from one color space to another
            grey_img = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
            invert = cv2.bitwise_not(grey_img)
            #image smoothing
            blur = cv2.GaussianBlur(invert, (61, 61), 0)
            invertedblur = cv2.bitwise_not(blur)
            sketch = cv2.divide(grey_img, invertedblur, scale=256.0)
            #show the converted image to specified path
            cv2.imshow("Sketch", sketch)
##            cv2.waitKey(0)
            while True:
                # Press 'q' to quit
                if cv2.waitKey(1)==ord('q'):
                    cv2.destroyAllWindows()
                    break
                # Press 's' to save Image
                elif cv2.waitKey(1)==ord('s'):
                    img = './Sketches/'+'sketch-'+time.strftime('%d-%m-%y-%H-%M-%S')+'.png'
                    
##                    img = 'Sketch.png'
                    cv2.imwrite(img,sketch)
                    print('Image Saved as: ',img)
                    cv2.destroyAllWindows()
                    break
        elif type(frame)==numpy.ndarray:
            print('sketching from webcam')
            image = frame
            # convert the image from one color space to another
            grey_img = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
            invert = cv2.bitwise_not(grey_img)
            #image smoothing
            blur = cv2.GaussianBlur(invert, (61, 61), 0)
            invertedblur = cv2.bitwise_not(blur)
            sketch = cv2.divide(grey_img, invertedblur, scale=256.0)
            #show the converted image to specified path
            cv2.imshow("Sketch", sketch)
##            cv2.waitKey(0)
            while True:
                # Press 'q' to quit
                if cv2.waitKey(1)==ord('q'):
                    cv2.destroyAllWindows()
                    break
                # Press 's' to save Image
                elif cv2.waitKey(1)==ord('s'):
                    img = './Sketches/'+'sketch-'+time.strftime('%d-%m-%y-%H-%M-%S')+'.png'
                    
##                    img = 'Sketch.png'
                    cv2.imwrite(img,sketch)
                    print('Image Saved as: ',img)
                    cv2.destroyAllWindows()
                    break
        else:
            print('Wrong / Invalid Image Selected.')
    except Exception as e:
        print('Error in Sketching..',traceback.format_exc(),e)
    

if __name__ == "__main__":
        print()
        webcam()
    In this File, there are two methods
    1. webcam
      1.  Responsible for opening webcam to capture the Pic.
    2. sketcher
      1. Responsible to sketch image dragged into GUI or picture clicked by the user.
    Last file called window.ui is the ui file for our GUI window made with QT Designer.
    To open /edit winodw.ui and modify the gui screen, like CSS, html or Widgets into GUI, you will need Qt Designer to be installed in your computer. 
    The codes under it are:

    window.ui
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    <?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <property name="styleSheet">
    <string notr="true">QPushButton#convertBtn{
	
	background-color: rgb(216, 0, 0);
	color: rgb(255, 255, 255);
border-radius:5px;
}
QPushButton#convertBtn::hover{
	
	background-color: rgb(59, 176, 0);
	
	color: rgb(0, 0, 0);
}

QPushButton{
	
	
	background-color: rgb(0, 0, 0);
	color: rgb(255, 255, 255);
border-radius:5px;
}
QPushButton::hover{
	
	background-color: rgb(59, 176, 0);
	
	color: rgb(0, 0, 0);
}</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout" stretch="0,1,0">
    <item>
     <widget class="QLabel" name="label">
      <property name="maximumSize">
       <size>
        <width>16777215</width>
        <height>25</height>
       </size>
      </property>
      <property name="styleSheet">
       <string notr="true">background-color: rgb(57, 124, 168);
color: rgb(255, 255, 255);
font: 14pt &quot;Arial Black&quot;;</string>
      </property>
      <property name="text">
       <string>Image to Sketch Converter</string>
      </property>
      <property name="alignment">
       <set>Qt::AlignCenter</set>
      </property>
     </widget>
    </item>
    <item>
     <widget class="QFrame" name="mainframe">
      <property name="frameShape">
       <enum>QFrame::StyledPanel</enum>
      </property>
      <property name="frameShadow">
       <enum>QFrame::Raised</enum>
      </property>
      <layout class="QHBoxLayout" name="horizontalLayout_2">
       <item>
        <layout class="QHBoxLayout" name="layout2"/>
       </item>
      </layout>
     </widget>
    </item>
    <item>
     <layout class="QHBoxLayout" name="horizontalLayout">
      <item>
       <widget class="QPushButton" name="camBtn">
        <property name="minimumSize">
         <size>
          <width>0</width>
          <height>30</height>
         </size>
        </property>
        <property name="font">
         <font>
          <pointsize>10</pointsize>
          <weight>75</weight>
          <bold>true</bold>
         </font>
        </property>
        <property name="text">
         <string>Open Camera</string>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QPushButton" name="convertBtn">
        <property name="minimumSize">
         <size>
          <width>0</width>
          <height>30</height>
         </size>
        </property>
        <property name="font">
         <font>
          <family>Microsoft Sans Serif</family>
          <pointsize>10</pointsize>
          <weight>75</weight>
          <bold>true</bold>
         </font>
        </property>
        <property name="text">
         <string>Convert to Sketch</string>
        </property>
        <property name="default">
         <bool>true</bool>
        </property>
        <property name="flat">
         <bool>false</bool>
        </property>
       </widget>
      </item>
     </layout>
    </item>
   </layout>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>

    To learn how to install Qt Designer and use, 
    Watch:-

     There is one folder called "Sketches"  under which your sketched images will be saved with suffix of current date and time.

    ................................................................

    This below Video guide will help you step by step in running the project successfully.


    Done!👍
    Make hiararchy of project just like shown on top of the blog and use.

    If you have any doubts, you can ask me on:
    To learn or get more advanced python projects,

    ________________________________________________

                Keep Coding, Keep Learning!

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