Convert Image into Sketch using Python & Streamlit

This web application converts an image into a sketch using Python and Streamlit. It is a simple and easy-to-use web application that can be created by anyone, regardless of their level of experience with Python or Streamlit.

In this web application we will simply upload an image & the application will then convert the image into a sketch and display it on the screen. You can then download the sketch to your computer.

The Web application uses the following Python libraries:
Streamlit: A Python library for creating web applications.
PIL: A Python library for image processing.
OpenCV: A Python library for computer vision.


Source Code :-

# importing libraries
import streamlit as st
import numpy as np
import cv2

# Setting page layout
st.set_page_config(layout="wide",page_title="Image to Sketch Converter")

st.title("Convert Image into Sketch")

def image_to_sketch(image):
# converting image into grayscale
img_gray=cv2.cvtColor(image,cv2.COLOR_BGR2GRAY)

# inverting the image
invert_img=cv2.bitwise_not(img_gray)

# Smoothning the image by blurring
smoothen_img=cv2.GaussianBlur(invert_img,(111,111),0)

# Converting image into sketch
sketch=cv2.divide(img_gray,255-smoothen_img,scale=255.0)

# Saving Sketch
cv2.imwrite("Sketch.png",sketch)



# Creating a file uploader widget
img=st.file_uploader("Upload an image",type=['jpeg','png','jpg','jfif'])



# By default
if img is None:
col1,col2,col3=st.columns(3)

with col1:
st.image(r"images\naruto.jpeg",caption='Original Image')
with col2:
st.image(r"images\arrow.png")
with col3:
st.image(r"images\naruto_sketch.png",caption="Sketch")

# If an image has been uploaded
if img is not None:
# convert image into numpy array
image=np.frombuffer(img.getvalue(),dtype=np.uint8)

# reshaping the image to have three channels
image=cv2.imdecode(image,cv2.IMREAD_COLOR)

# Creating a button
convert=st.button("Convert")

# If button is clicked
if convert:
image_to_sketch(image)

col1,col2=st.columns(2)
with col1:
st.image(img,caption="Original Image")
with col2:
st.image("Sketch.png",caption="Sketch")

with open("Sketch.png","rb") as file:
btn_id=st.download_button(
label="Download Sketch",
data=file,
file_name="Sketch.png",
mime="image/png"
)

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