Re: VMs: Beinecke & MrSID...

[Nick Pelling <incoming@xxxxxxxxxxxxxxxxx>]

Hi Claudio,

Here's a direct link to the SID file in question: you can get this by 
clicking on Copy Shortcut (or whatever) on the zoom button, and editing out 
the JavaScript wrapper to leave the filename:-
	http://130.132.81.137/PATREQIMG/sids/D0521/1013391.sid

As to why they'd prefer it to PNG etc: 3279 x 4566 x 24-bit RGB = 44915742 
bytes, while the .sid file size is only 2.5MB - ie, it's compressed about 
18:1, and the quality is excellent. By way of comparison, JPEGs tend to 
start exhibiting occasionally ugly artefacts around 10:1 - 12:1.

Probably the most suitable compressor would be JPEG2000, but that's a 
standard that's still (well) "settling down", and libraries tend 
(understandably) to be quite conservative in their choice of compression 
technology.

BTW, LizardTech also released (IIRC) a Java viewer for MrSID files, which 
should work fine under Linux (if somewhat slower). Might be worth trying to 
dig up, though.

Cheers, ....Nick Pelling....


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