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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Mon, 27 Mar 2000 19:15:38 GMT
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Reply-To:
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RUI.MARTINS@stopspammersLINK.PT
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Viewed:
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1751 times
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> What are the preferred file formats for these pics? Right now I have
> ldglite dumping png files since they're true color, fairly well compressed,
> and not lossy like jpg. I could make bmp an option since I had that
> working before I switched to png. I could add others if people really
> want them.
JPG is NOT lossy, i.e. it's NOT required to be lossy, it can be defined
to be 100% accurate !
> In lugnet.cad.dev, Don Heyse wrote:
>
> Png is a good format, but still not very widespread. LDAO reads bmp 10x
> faster than anything else, and doesn't recognize png.
>
> I usually do gif for web stuff, and bmp-rle for local stuff.
>
> Steve
Actually I think that the best format is the GIF format, due to the type
of compressing it uses and our specific renderer used for the cataloging
task.
- BMP in it's pure form, it's just like a memory dump, but with RLE
compression could be good, but I don't actually know how the compression
algo to provide an opinion. Also I think that BMP-RLE PROGRAMS have to PAY
ROYALTIES or a LICENCE to be able to be distributed, but I' NOT sure
- GIF is good for draw type images, lots of equal pixels, with pixel
sequences also compressed. This format could also have to have a LICENCE,
since it's registered by someone (don't remember who), but due to the
internet, everybody uses it, and no one is beeing persued ! ;)
It has the limitation of 256 colors, which is NOT really a limitation for
a parts listing.
- JPG is NOT apropriate for our part images, it's good for real images or
images which contain shades, due to it's compressing algo.
- PNG is good for the same types of images that JPG is good, as some extra
functionality, but overall the files are always bigger than JPG files
saved without lossy compression. This format is trully open, everybody can
save or read these files without problem.
See ya
Rui Martins
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Message has 2 Replies:
 | | 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)
| | | Re: Parts Cataloging Program
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| Rui: (...) You are probably right, but JPEG is defined _for_ lossy compression. It is definitely not the correct choice if you want loss-less compression. (...) Maybe, but GIF is covered by a patent (not a problem in Europe yet), and PNG generally (...) (25 years ago, 29-Mar-00, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Parts Cataloging Program
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| (...) Which pics? The ones in the ldraw\vec directory? Or part-images in general? Png is a good format, but still not very widespread. LDAO reads bmp 10x faster than anything else, and doesn't recognize png. I usually do gif for web stuff, and (...) (25 years ago, 24-Mar-00, to lugnet.cad.dev)
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