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    Images PreProcessor - PrePNG

    PrePNG is simple program - just recreate png images without compression, but with forcing filtration (delta, average & Paeth Predictor). Output format, of course, is png too. In most cases (not always) of my tests it's better than FreeARC's MM-filter or nanozip's graphics filter. Processing speed is around as lzma decomp speed. Drag'n drop works too.
    On images like "rafale.bmp", which do not require filtration, that stuff doesn't help.

    Chain of PrePNG+BCM sometimes compress better than JPEG2k or a little worse. Also, lc8 param in lzma, greatly improve compression in most cases.

    RGB Image (24 bit, 1024x768, 2 359 350 bytes):

    -7z = 918898
    -rar = 860522
    -bcm = 769808
    -JPG2k = 616074 (lossless)

    MM:c3:w8+
    -7z = 768540 (lzma)
    -FreeARC = 730212 (lzma with lc8 option)
    -FreeARC = 686405 (grzip:l)
    -BCM = 657962

    PrePNG+
    -7z = 717447
    -FreeARC = 683720 (lzma:lc
    -FreeARC = 632793 (grzip:l)
    -BCM = 610364

    Heavy artillery:
    -BMF 1.1 = 489868 (-s -f -q9)
    -PAQ8px = 460780 (-4) 6* version, don't remember exactly.
    -BMF 2009 = 427484 (-s -q9)
    -------------------------------------

    File "BIG.png" from Gralic thread:
    PNM: 4 747 457 bytes
    PNG: 1 882 722 bytes
    JBG: 1 797 888 bytes
    7Z: 1 596 148 bytes
    GRALIC: 1 346 379 bytes (4 s)
    PAQ8PX: 1 271 445 bytes (143 s)
    BCMed:
    PrePNG: 1 451 100 bytes
    BMP: 1 812 827 bytes

    7zip'ed:
    PrePNG+7z: 1 728 496 bytes (worse than bmp+7z)
    PrePNG+Freearc: 1*647*664 (lzma:lc
    Attached Files Attached Files

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