Editing Data Compression (section)

== <span style="color: #FFFFFF;">Applying</span> ==
'''Modeling 'Run-Length Encoding' (A simple lossless algorithm):'''
<syntaxhighlight lang="python">
def rle_compress(data):
    """
    Compresses 'AAABBC' into '3A2B1C'
    """
    if not data: return ""
    
    compressed = []
    count = 1
    for i in range(1, len(data)):
        if data[i] == data[i-1]:
            count += 1
        else:
            compressed.append(f"{count}{data[i-1]}")
            count = 1
    compressed.append(f"{count}{data[-1]}")
    
    return "".join(compressed)

raw = "WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWB"
comp = rle_compress(raw)
print(f"Original: {len(raw)} chars")
print(f"Compressed: {comp} ({len(comp)} chars)")
print(f"Efficiency: {round((1 - len(comp)/len(raw))*100, 1)}% reduction")
</syntaxhighlight>

; Compression Landmarks
: '''The 'LZW' Algorithm (1984)''' → The basis for the GIF and ZIP formats, which allowed the early internet to handle images.
: '''The 'JPEG' Standard (1992)''' → The invention that made digital photography possible by shrinking 10MB photos into 1MB files.
: '''The 'MP3' Revolution (1990s)''' → Changed the music industry forever by making songs small enough to "Share" (and pirate) over slow dial-up modems.
: '''H.264 / HEVC''' → The advanced video compression that allows you to watch 4K movies on Netflix without clogging the entire world's internet.
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