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 00:39:24 GMT
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Viewed:
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770 times
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In lugnet.cad, Mark Bellis wrote:
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In lugnet.parts.custom, Larry Pieniazek wrote:
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In lugnet.parts.custom, Mark Bellis wrote:
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...
It’s just that I usually post jpegs or bitmaps
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Please consider not posting bitmaps. They are very space intensive and take
a long time to load. Instead use a lossless compressed format like .gif if
you can. In my view jpegs are not as good for things like line drawings,
they are better for continuous tone photos.
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I only use bitmaps when they are smaller than the equivalent jpeg - ie they
are monochrome ones. This was the case for the parts I’ve drawn so far.
I’ve used jpegs for colour pictures up to now.
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?
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Not sure if its the best, but certainly used a lot. It is lossless.
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If so, why
doesn’t everyone use them?
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Well a lot of people do. But that changed a while back because CompuServe (who
own the format) threatened to charge royalties for using it. I don’t think
anything came of that, but lots of websites converted all their GIFs to other
formats in case.
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I’ve seen animation in GIFs - how do you do that?
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The GIF format allows for multiple frames per file. You need a program that can
manipulate animated GIFs, I use animation shop that comes with paint shop pro.
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What are PNGs used for, since they lose definition?
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Well they shouldn’t do - PNG is also lossless. It may be the program you were
viewing with doesn’t handle them well. The reason it’s larger for monochrome is
that it always saves at least an 8-bit palette.
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Are GIFs or PNGs any more vulnerable to viruses than jpegs or bitmaps?
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Not that I know of.
There’s a little info here and some
in-depth PNG info here.
ROSCO
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