PNG Process

pngencode

pngencode(img: np.ndarray, compression: int = 1) -> Union[bytes, None]

• Description: Encodes a NumPy image array into a PNG format byte string.

• Parameters:

  • img (np.ndarray): The image array to encode.
  • compression (int): The compression level, ranging from 0 to 9. 0 means no compression, and 9 represents maximum compression. Default is 1.

• Return value:

  • bytes: The PNG format byte string after encoding.

• Example:

  import numpy as np
  import capybara as cb
  
  img_array = np.random.rand(100, 100, 3) * 255
  encoded_bytes = cb.pngencode(img_array, compression=9)

pngdecode

pngdecode(byte_: bytes) -> Union[np.ndarray, None]

• Description: Decodes a PNG format byte string into a NumPy image array.

• Parameters:

  • byte_ (bytes): The PNG format byte string to decode.

• Return value:

  • np.ndarray: The image array after decoding.

• Example:

  decoded_img = cb.pngdecode(encoded_bytes)