【转】Protocol Header Images

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### PWG Raster Print Format Specification and Usage PWG Raster, also known as Printer Working Group (PWG) Raster Image Protocol, defines a standard format for sending raster images to printers. This protocol ensures interoperability between different printer models and operating systems by specifying how image data should be structured before being sent to the printer. The key aspects of this specification include: - **Image Structure**: The document describes that each page is represented as a series of scan lines where every pixel can have multiple bits depending on color depth requirements[^1]. - **Color Encoding**: For monochrome printing, one bit per pixel suffices while full-color documents may use up to four bytes per pixel representing cyan, magenta, yellow, black (CMYK), or red, green, blue (RGB). - **Compression Methods**: To optimize transmission efficiency, various compression techniques are supported including run-length encoding which compresses sequences of identical pixels into shorter representations. In practical application within printing systems, software applications generate print jobs using these specifications ensuring compatibility across diverse hardware platforms supporting PWG standards. When a user submits a job through an OS-level interface like CUPS (Common UNIX Printing System), it gets converted into the appropriate form adhering to PWG guidelines prior to reaching the target device. For developers looking to implement support for PWG Raster in their solutions, understanding both high-level concepts outlined here alongside detailed technical documentation provided by organizations such as IEEE would prove invaluable. ```python import struct def encode_raster_image(data, width, height, bpp=8): """ Encodes raw pixel data into a simple uncompressed PWG Raster stream. :param data: List of integers representing pixel values. :param int width: Width of the image in pixels. :param int height: Height of the image in pixels. :param int bpp: Bits Per Pixel value indicating color depth. :return: Bytes object containing encoded raster data. """ header = b'RG' version = 0x01 # Construct binary representation with headers followed by actual bitmap content result = bytearray() result.extend(header) result.append(version) result += struct.pack('>HH', width, height) result += bytes(data) return bytes(result) # Example usage generating dummy test pattern dummy_data = [i % 256 for i in range(10 * 10)] # Create 10x10 grid varying from 0-255 encoded_stream = encode_raster_image(dummy_data, 10, 10) print(f"Encoded Stream Length: {len(encoded_stream)}") ```
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