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Thread: Lossless compression formats using LZMA or LZMA2 ?

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    Member Karhunen's Avatar
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    Lossless compression formats using LZMA or LZMA2 ?

    It may be that LZMA is not sufficiently better than deflate level compressers, but I could only find this format eBMP "extended Bitmap"
    http://lainx.comuf.com/ebmp/

    I know there are other strategies for bitmap packing and reconstruction, but am interested primarily if there is adoption of LZMA for 8,16,24,32 bit indexed,RGB,RGBA
    colourspaces and if there are open standards, like if the format could be implemented as a plugin for Xnview or Irfanview.

    Thank You for your consideration.

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    Member m^2's Avatar
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    Interesting link, thanks

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    Member BetaTester's Avatar
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    - JPEG 100% quality is lossy compression
    - eBMP use Jpeg 100% quality
    - eBMP is lossy compression

    JPG-BMP-Test.7z

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    Member Karhunen's Avatar
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    I was re-reading Matt Mahoney DCE and saw this paper describing a format, but likely this is theoretical. A Novel Implementation of JPEG 2000 Lossless Coding Based on LZMA

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    I have my own Wikipedia page???

    I did a little test:
    cjpeg -quality 100 -sample 1x1,1x1,1x1 lena.bmp lena.jpg
    djpeg -bmp lena.jpg out.bmp

    About 42% of the bytes differ from the original, usually by 1 or 2. Quality 100 sets all of the quantization table values to 1, so the loss must occur in the color transform and DCT/IDCT.

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    Member Karhunen's Avatar
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    Yeah, I was just checking the spelling of your name Last activity was almost a year ago, maybe you should ask for it to be merged with Ocarina. A real-world de-duplication effort

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    Matt Mahoney's Avatar
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    I guess I'll just leave it. It's accurate.

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