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Automation & scripting easy

Create Mock Watermarked Image Bytes in Python Without PIL

Builds a mock image-like byte stream with an embedded watermark using only stdlib modules, for testing pipelines without PIL.

watermark bytes zlib
Python 
from io import BytesIO
import zlib
import struct


def create_watermarked_bytes(width: int, height: int, watermark: bytes) -> bytes:
    """Create a mock image-like byte stream with a watermark (no PIL)."""
    header = struct.pack("<2I", width, height)
    payload = watermark * max(1, (width * height // max(1, len(wa…
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