Subject:
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Re: Visio and Picture formats (was New Parts Drawings - Plates, Slope, Track Pieces)
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Newsgroups:
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lugnet.cad
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Date:
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Sun, 6 Feb 2005 19:18:18 GMT
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Viewed:
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1215 times
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"Mark Bellis" <mark.bellis@tiscali.co.uk> wrote in
news:IBGoCB.23B3@lugnet.com:
> I did a test with the 4x4 round plate drawing:
> monochrome bitmap is 34KB
> jpeg is 66KB
> png is 63KB but loses definition
> gif is 13KB
> In this case the jpeg is larger than the bitmap, which is why I posted
> the bitmap. I haven't yet investigated GIFs or PNGs, so perhaps you
> could tell me: Is GIF the standard highest compression, lowest loss
> format? If so, why doesn't everyone use them? I've seen animation in
> GIFs - how do you do that? What are PNGs used for, since they lose
> definition? Are GIFs or PNGs any more vulnerable to viruses than jpegs
> or bitmaps?
Could you post an example of a PNG that 'loses definition,' please? I
think you must be doing something wrong there, since PNG is a lossless
format. What program did you use to convert it?
GIF is not a very good format, IMO, because for one it's encumbered by
patents (it's not free to use), and it's limited to 256 colours. JPG
offers full colour, but is lossy, while PNG offers the best of all
worlds: full colour (fine for photographs), lossless (fine for line
drawings), great compression and it's patent-free.
Koyan
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