Hi Christiane,
Please let me add a few comments on your raster formats. There are 3 kinds
of bitmap formats:
Uncompressed: TIF, BMP, PSD
Compressed, loss-less: PNG, TIF, GIF
Compressed, with loss: JPG
Main comment is PNG is not a compromise between size and quality, since
quality is as good as in the uncompressed formats. Secondly: TIF exists both
in compressed and uncompressed versions (both loss-less). That is called
"TIFF LZW" in MapInfo.
But I agree, when you say PNG is the way to go :-)
Regards
Uffe
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Thursday, September 01, 2005 5:29 PM
Subject: MI-L Réf. : MI-L save window & print resolution
Hi,
I encountered the same kind of problems one year ago while we prepared our
atlas for print. When you chose to export your windows, there are several
types of format which you can chose.
a) Raster format export your maps as if they were photographs. That could
create huge files depending on your resolution and map dimension. Nowaday
printers takes up to 1200dpi if they are good printers. But 600 dpi shold
be good enough.. With raster format, things could go wrong in different
ways; one important thing lies with PageMaker too : are you sure that you
have chosen the right options in dealing with the picture ? Sometimes it
can compress pictures which isn't a good idea. There are two kinds of
raster formats : the uncompressed ones : *.tif, *.bmp, *.psd; the first
is the most frequently used; the second is a Microsoft format and the last
is a Photoshop format. Of the three, the tif format is probably the most
frequently used. Among the compressed files format, you have the *.jpg and
the *.png. The frequently encountered jpg format, is a compressed format
which creates bad artifacts with limits and could blurr your maps; it's
made for photographic images, not for charts or maps which should keep
clean borders. The *png format is also compressed but of better quality.
It's the way to go if you want a good compromise between size and quality.
If space isn't a criteria, then the Tif format is better. As far as
compressed format goes, it would be better to have *.Gif format rather
than *.jpg. The former is able to keep clean borders, while the other
isn't.
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