python making bitmap data from 2d array

Question

I have a device that accepts bitmap binary data. I would like to convert a numpy 2d array to bitmap and send it to this device. Currently what I do is to save the 2d array to a bitmap file, then read it into a variable and send that to the device. I'd like to skip the writing to the disk step. Is there an easy way to do that in Python?

Yes, there are many ways; go ahead and do it; ask a question if you face difficulties — Reblochon Masque
– Reblochon Masque, Commented Aug 18, 2018 at 11:09

Hamid Ohadi · Accepted Answer · 2018-08-18 11:38:44Z

1

You can use io.BytesIO as a memory buffer to store the bitmap and send it without writing to disk.

As an example, assuming you use PIL or Pillow to save your bitmap file :

import io
from PIL import Image

image = Image.fromarray(numpy_array)
if image.mode != 'RGB':
    image = image.convert('RGB')

with io.BytesIO() as f:
    image.save(f, format='BMP')
    send_to_device(f)

edited Aug 18, 2018 at 11:38

Hamid Ohadi

659 bronze badges

answered Aug 18, 2018 at 11:15

Vil

1268 bronze badges

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