Re: Zip files
- From: "news@xxxxxxxxxxxxxxx" <news@xxxxxxxxxxxxxxx>
- Date: Wed, 11 Jul 2007 05:35:35 -0700
On Jul 11, 10:10 am, Ray Dawson <r...@xxxxxxxxxxxxxxxxxxxxxx> wrote:
JPEGs are already compressed and zipping them can actually make them
larger. GIF and TIFF files are larger, but do compress in zips.
A meaningless comment, in my opinion. JPEGs are best suited to
'natural' images (e.g. photographs); GIFs are best suited to simple
graphics and line-drawings. You cannot generalise and say that "GIF
and TIFF files are larger" than JPEGs; a GIF or TIFF may be *much*
smaller than a JPEG if the image is suited to its style of
compression. Also, the degree of compression of a JPEG is variable,
so for a given picture a JPEG file may be small but low quality or
large but high quality.
Your 3MB is very large for a scan. My A4 black and white 300 dpi scans
are usually only 1MB.
I don't think the OP stated that his scan was A4 nor that it was 300
dpi, so I don't see how you can claim that 3MB is "very large". It's
easy to calculate the raw data size: A4 black and white (1 bpp) at 300
dpi corresponds to just over 1 Mbyte; A4 full colour (24 bpp) at 100
dpi corresponds to just under 3 Mbytes.
Richard.
http://www.rtrussell.co.uk/
To reply by email change 'news' to my forename.
.
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