Python Script to convert Image into Byte array

Question

I am writing a Python script where I want to do bulk photo upload. I want to read an Image and convert it into a byte array. Any suggestions would be greatly appreciated.

#!/usr/bin/python
import xmlrpclib
import SOAPpy, getpass, datetime
import urllib, cStringIO
from PIL import Image
from urllib import urlopen 
import os
import io
from array import array
""" create a proxy object with methods that can be used to invoke
    corresponding RPC calls on the remote server """
soapy = SOAPpy.WSDL.Proxy('localhost:8090/rpc/soap-axis/confluenceservice-v2?wsdl') 
auth = soapy.login('admin', 'Cs$corp@123')

why would you want that? how would that help you to upload? theres not enough data for a meaningful answer — WeaselFox
– WeaselFox, Commented Mar 12, 2014 at 12:18
@WeaselFox : I want to read an Image file and convert it into Byte array. — Akash Bhardwaj
– Akash Bhardwaj, Commented Mar 12, 2014 at 12:27
#pictureData = xmlrpclib.Binary(open('C:/BulkPhotoUpload/UserPhotos/admin.png').read()).decode('utf-8') url = 'C:/BulkPhotoUpload/UserPhotos/admin.png' pictureData = unicode(str(open(url,"rb"))) print type(pictureData) profilePictureAdded = soapy.addProfilePicture(auth, 'admin', 'avatar.png', 'image/png', pictureData) if profilePictureAdded: print "Successfully added new profile picture..." else: print "Failed to add new profile picture..." — Akash Bhardwaj
– Akash Bhardwaj, Commented Mar 12, 2014 at 12:32
@WeaselFox I was looking this question to my odoo module. I upload an image to an S3 and I wanted to create a thumbnail on the fly, thanks to this question I can :) — fnaquira
– fnaquira, Commented Jun 23, 2020 at 4:07

Karthik Vg · Accepted Answer · 2019-02-22 07:47:15Z

94

Use bytearray:

with open("img.png", "rb") as image:
  f = image.read()
  b = bytearray(f)
  print b[0]

You can also have a look at struct which can do many conversions of that kind.

edited Feb 22, 2019 at 7:47

Karthik Vg

10813 bronze badges

answered Mar 12, 2014 at 12:43

Thomas Baruchel

7,5353 gold badges29 silver badges49 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Thomas Baruchel Over a year ago

BTW. It is more meaningful to do that with image formats where you can directly interpret the data, which is the case for instance with the PNM family (PBM, PGM, PPM).

therealak12 Over a year ago

How to do the reverse of this conversion, i.e. converting bytearray to image?

lam vu Nguyen Over a year ago

I like it because it is the most basic, I have a shortage of rb

Rami Alloush · Accepted Answer · 2021-12-07 03:11:30Z

21

This works for me

# Convert image to bytes
import PIL.Image as Image
pil_im = Image.fromarray(image)
b = io.BytesIO()
pil_im.save(b, 'jpeg')
im_bytes = b.getvalue()

edited Dec 7, 2021 at 3:11

answered Feb 25, 2019 at 20:18

Rami Alloush

2,6462 gold badges32 silver badges34 bronze badges

2 Comments

Ghoul Fool Over a year ago

What are you returning? - there's no function defined

Rami Alloush Over a year ago

@Ghoul Fool I copied it from my original function .. updated the answer to remove the return statement. Thanks

Vipul · Accepted Answer · 2014-03-12 12:30:26Z

16

i don't know about converting into a byte array, but it's easy to convert it into a string:

import base64

with open("t.png", "rb") as imageFile:
    str = base64.b64encode(imageFile.read())
    print str

Source

edited Mar 12, 2014 at 12:30

Vipul

4,2269 gold badges35 silver badges56 bronze badges

answered Mar 12, 2014 at 12:26

cptPH

2,4111 gold badge30 silver badges36 bronze badges

1 Comment

The Dan Over a year ago

What's the best way to decode it, let's say into a PNG file??

perillaseed · Accepted Answer · 2015-02-27 14:36:50Z

6

with BytesIO() as output:
    from PIL import Image
    with Image.open(filename) as img:
        img.convert('RGB').save(output, 'BMP')                
    data = output.getvalue()[14:]

I just use this for add a image to clipboard in windows.

answered Feb 27, 2015 at 14:36

perillaseed

1193 silver badges4 bronze badges

1 Comment

wordsforthewise Over a year ago

So BytesIO() is from the io package (io.BytesIO()). I tried this code but it gave me the error AttributeError: exit

Ranjeet R Patil · Accepted Answer · 2023-01-06 07:15:44Z

#!/usr/bin/env python
#__usage__ = "To Convert Image pixel data to readable bytes"

import numpy as np
import cv2
from cv2 import *

class Image2ByteConverter(object):

    def loadImage(self):
        # Load image as string from file/database
        file = open('Aiming_ECU_Image.png', "rb")
        return file

    def convertImage2Byte(self):
        file = self.loadImage()
        pixel_data = np.fromfile(file, dtype=np.uint8)
        return pixel_data

    def printData(self):
        final_data = self.convertImage2Byte()
        pixel_count = 0
        for data in final_data:
            pixel_count += 1
            print("Byte ", pixel_count,": ", int(data))

    def run(self):
        # self.loadImage()
        # self.convertImage2Byte()
        self.printData()

if __name__ == "__main__":
    Image2ByteConverter().run()

This Worked for me.

Pre-requisites:

python -m pip install opencv-python
python -m pip install numpy

Collectives™ on Stack Overflow

Python Script to convert Image into Byte array

5 Answers 5

3 Comments

2 Comments

1 Comment

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

3 Comments

2 Comments

1 Comment

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related