Subject:
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Re: Parts Cataloging Program
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 28 Mar 2000 17:26:05 GMT
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Viewed:
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1940 times
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In lugnet.cad.dev, Steve Bliss writes:
> In lugnet.cad.dev, Rui Martins wrote:
> > JPG is NOT lossy, i.e. it's NOT required to be lossy, it can be defined
> > to be 100% accurate !
>
> Is there some other way to compress JPG files, besides lowering the
> quality? Whenever I save a JPG file with 100% accuracy, the saved file
> is huge (ie, about the same size as a similar BMP file).
This problem is why I chose PNG. It compresses flat shaded images quite
well and still retains the true color pixels. My comprehensive testing of
one sample image (the one on the LdGLite web page) put the PNG file at
about half the size of the BMP file. You can get better compression with
JPEG but at a significant loss of quality.
> UniSys is the company which holds a patent on the LZW compression
> algorithm employed in the GIF format. Any software which codes or
> decodes GIF-format files needs to obtain a license from UniSys. It
> seems reasonable that a program which processes GIF files, but does not
> touch the LZW-encoded data blocks[1] would not need a license. Using
> GIF files, or using a software package which manipulates GIF files, does
> not require a license.
>
> But, as Rui noted, UniSys is not going after everyone for violating the
> patent.
That's too bad, since it pretty much rules out GIF output directly from
LdGLite. The last thing I need is annoying licensing restrictions.
> 1) LDAO does this -- the HTML Generator uses ImageMagick to convert BMP
> to GIF, and then LDAO tweaks the palette entries in the GIF files,
> without touching the data blocks.
Why do you have to tweak the palette entries? Should I be tweaking the
true color values in the PNG files from LdGLite?
Don
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Message has 1 Reply:
 | | Re: Parts Cataloging Program
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| (...) Well, it's not *that* big'o'deal: GIF is restricted to 256 colors. If you convert down to 256 colors, will PNG give compression on par with GIF? If it doesn't, you can always look into BMP/RLE. FYI, here are some links into the MS (...) (25 years ago, 28-Mar-00, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Parts Cataloging Program
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| (...) Is there some other way to compress JPG files, besides lowering the quality? Whenever I save a JPG file with 100% accuracy, the saved file is huge (ie, about the same size as a similar BMP file). (...) I've never heard of any kind of (...) (25 years ago, 28-Mar-00, to lugnet.cad.dev)
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