python: how to display a image directly from bytes string variable?

Question

I have a byte string variable fig which I get from another API.

print(fig)

b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\....'

How can I display a picture directly from this variable?

PS: I don't want to store this variable in a PNG file, then use matplotlib to read and show.

@MadPhysicist Yes, pillow.readthedocs.io/en/stable/reference/… however, I don't know which mode I can choose. I tried several ones and report error — maplemaple
– maplemaple, Commented May 21, 2020 at 4:43
Could you provide the full PNG? Perhaps dump the string to a file and post it here. — Mad Physicist
– Mad Physicist, Commented May 21, 2020 at 5:24

lenik · Accepted Answer · 2020-05-21 04:42:12Z

3

Something like this should help:

import numpy as np
import cv2

nparr = np.fromstring(img_str, np.uint8)
image = cv2.imdecode(nparr, -1)

cv2.imshow('image', image)
cv2.waitKey(0)

answered May 21, 2020 at 4:42

lenik

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