CODEWITHSUNDEEP
pythonpngpypng
Shonte Amato-Grill
Shonte Amato-Grill

Reputation: 11

Iterative writing with PyPNG

I was wondering if there is a way to iteratively write png files using PyPNG (as in, row-by-row, or chunk-by-chunk) without providing the png.Writer() with the entire data. I've looked through the documentation, but all the writer methods require all rows of the PNG at once (uses too much memory).

Thanks in advance!

Upvotes: 1

Views: 539

Answers (1)

David Jones
David Jones

Reputation: 5149

If you supply an iterator, then PyPNG will use it. Full example:

#!/usr/bin/env python

import random

import png

def iter_rows():
    H = 4096
    for i in xrange(H):
        yield [random.randrange(i+1) for _ in range(4096)]


img = png.from_array(iter_rows(), mode="L;12",
                     info=dict(size=(4096,4096)))
img.save("big.png")

Upvotes: 1

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