How do I convert a binary image into an in-memory data structure in python?

Question

Context:

I am using python 2.6.5

Goal:

Read a binary image file and represent it in-memory. Then run a checksum on it. Deliver the binary representation to be stored as a blob in mysql.

Comments:

I have read this SO thread.
I have looked at the struct module.
I also have bumped into the io module.
With all the available options, I am not certain which is the best solution. The BytesIO data structure seems to be suitable for my needs. Which one do you think will meet my requirements ?

When you read the blob back from mysql, will you be working with it as an image or just writing it back to a file? — Mark Ransom
– Mark Ransom, Commented Feb 22, 2012 at 21:42
Please up vote and select one of the 2 below and select an answer if applicable — Matt Alcock
– Matt Alcock, Commented Feb 23, 2012 at 0:13

Jonathan Root · Accepted Answer · 2013-08-11 14:54:28Z

4

I'd recommend using PIL (Python Image Library)

http://effbot.org/imagingbook/pil-index.htm

Save it down to a string and then write to the db. Then you can use the string butter interface to PIL to read it back out.

edited Aug 11, 2013 at 14:54

Jonathan Root

5542 gold badges14 silver badges31 bronze badges

answered Feb 22, 2012 at 21:37

Matt Alcock

13k15 gold badges49 silver badges61 bronze badges

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

Comments

Janne Karila · Accepted Answer · 2012-02-22 12:40:58Z

0

>>> from binascii import crc32
>>> with open(filename, "rb") as f:
...     data = f.read()
...
>>> crc32(data)
361260080

answered Feb 22, 2012 at 12:40

Janne Karila

25.3k6 gold badges59 silver badges97 bronze badges

1 Comment

Kos Over a year ago

This calculates a checksum of the file, not the checksum of image data. . This means it will generate a different checksum for 2 .pngs with identical image but different metadata. Might be relevant

Collectives™ on Stack Overflow

How do I convert a binary image into an in-memory data structure in python?

2 Answers 2

Comments

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related