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Geek Culture / how do you make your own compression

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Osiris
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Location: Robbinsdale, MN
Posted: 23rd Jan 2005 12:35
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software?, can you do it in darkbasic?

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Ilya
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Posted: 23rd Jan 2005 12:37
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Yes.

File commands...

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Osiris
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Posted: 23rd Jan 2005 12:46 Edited at: 23rd Jan 2005 12:46
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well i mean what commands would i need, and how would i make the compression algorithm, also i am using dbc


p.s. sorry if thats a little much

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Jeku
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Location: Vancouver, British Columbia, Canada
Posted: 23rd Jan 2005 16:41
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Look up any old algorithm in Google. As long as you can get a math equation you can do it in DB.


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David T
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Location: England
Posted: 23rd Jan 2005 18:48
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Easiest way is run length encoding (RLE).

Say you have a stream of data like so:


111159333377777777755666624

That could be expressed as

411519439725361214

That is:

4 1's
1 5
1 9

etc.

Basically store the number of repeated values, then the actual value, so when the program reads it in you canrecreate the data without having every value. It works best for images with big block colour sections.

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Dave J
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Posted: 23rd Jan 2005 19:53
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Somewhat like the PNG compression.


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Benjamin
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Location: France
Posted: 23rd Jan 2005 20:24
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Cept PNG has a failsafe method so if the image is very complex, it won't try and compress huge parts it can't.

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ReD_eYe
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Posted: 24th Jan 2005 01:30
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Thats very clever.


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blanky
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Posted: 27th Jan 2005 23:56
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PNG *RULES*

Have you ever used the PNG codec in the Quicktime MOV format? That was the one reason I asked if DBC supported MOV files...

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