[sdiy] GR-500 schematics

[Andre Majorel]

On 2006-07-25 23:59 +0300, Samppa Tolvanen wrote:
> On 7/25/06, Andre Majorel <aym-htnys at teaser.fr> wrote:
>
> >The secret is to reduce the scan to black and white (as opposed to
> >greyscale). Once that is done, a scan of a typical text or line
> >art document becomes very redundant and lossless compression
> >algorithms can be used. I use TIFF with the Group 4 compression
> >method. It yields compression ratios on the order of 100.
> 
> Hmm, I have become a great fan of PDF since the storage medium sizes
> alloved me to carry it home. I guess for free printer driver type
> solutions it still allows lossless LZW compression, right. (And JPG
> too).

PostScript (and hence PDF) supports several compression methods,
including JPEG. I don't think it supports Group 4 but I does have
a comparable lossless compression method (LZW, I think).

My experience has been that a TIFF/Group 4 file and a
PostScript/PDF file of the same image are usually within a few
percents of each other. My PostScript generator is pnmtops from
the NetPBM suite.

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>
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