Convert Image to Base64 and Vice-versa

 

NOTE : When converting base64 to Image , make sure to remove the staring "data:image/png;base64" from the string.


Python



import pybase64
from PIL import Image
import matplotlib.pyplot as plt
from PIL import Image
import io
import numpy as np


# Takes base64 string and returns the Image as numpy array
def decodeBase64ToImage(base64_string):

    # decoding base54 to bytes
    print("Converting base64 to bytes...")
    decoded = pybase64.standard_b64decode(base64_string)
    print("LENGTH : ",len(decoded))
    print("TYPE1 : ",type(decoded))

    # converting bytes to image
    print("Converting bytes to image...")
    stream = io.BytesIO(decoded)
    img = Image.open(stream)

    print("Converting image to numpy array...")
    img = np.array(img)
    print("TYPE2 : ",type(img))

    return img



from io import BytesIO

# Takes numpy array and decode's the image as base64
def encodeImageToBase64(numpy_img):

    """
    code referenced from :
    https://jdhao.github.io/2020/03/17/base64_opencv_pil_image_conversion/

    Instead of saving the PIL Image object img to the disk, we save it to
    im_file which is a file-like object.
    """

    # Rescaling between 0-255 and convert to integers
    img = Image.fromarray(np.uint8(numpy_img*255))

    im_file = BytesIO()
    img.save(im_file, format="JPEG")
    im_bytes = im_file.getvalue()  # im_bytes: image in binary format.
    im_base64 = pybase64.standard_b64encode(im_bytes)

    # decode bytes to string
    encoded = im_base64.decode('utf-8')

    return encoded




Javascript



var fs = require("fs");


// Takes image path and returns as base64
function encodeImageToBase64(img_path){
  base64_img = fs.readFileSync(img_path, 'base64');
  return base64_img;

}

// Takes base64 string and saves the decoded image.
function decodeBase64Image(base64_string, filename = "stylized_image.jpg") {
  if (base64_img != null) {
    var ReadableData = require("stream").Readable;
    const imageBufferData = Buffer.from(base64_string, "base64");
    var streamObj = new ReadableData();
    streamObj.push(imageBufferData);
    streamObj.push(null);
    streamObj.pipe(fs.createWriteStream(filename));
    console.log("Image Saved as : ",filename)
  }
}


const img_path = "C:/Users/dipesh/Desktop/NST/photos/liberty.jpg";
const base64_Img = encodeImageToBase64(img_path);
decodeBase64Image(base64_Img)



Encode Image in ReactJS

// pass the filepath
 function getBase64(file_path) {      
  const reader = new FileReader();
  reader.onload = (event) => {
    return event.target.result;
  };
  reader.readAsDataURL(file_path);
}


NOTE : https://www.npmjs.com/package/react-file-base64  (Use to create Base64 Image Uploader)













































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