Thanks for putting things more clearly than I did.. BTW, GIF isn't always
lossless. It can do nasty things to your colors if you chose a low number
of colors (less than there are in your maps). But it compress very well
if you have few colors. Sometimes I export large Tiffs and convert them
to GIF in Photoshop. Anyway, you can't export directly from MIP, as was
requested by the person who asked the question.
Also to be more precise : png or tif is the way to go if you have to stay
in raster mode. But if you have much details and fine lines in your maps,
the vector format is always much better. It's really a pitty that MapInfo
doesn't allow exportation in eps mode.. I wonder why it is so ? because
MIP don't want to be a fee to Adobe, or whoever invented that postscript
format ? or may be it is because that would imply the translation from
rgb values in cmyk values and the implementation of a lot of new code ?
who knows.. any way, it's a pain to be left with only the wmf format,
because in the press world they don't like window things.. MIP should also
implement CMYK palettes. With RGB printing to real world press print is a
nightmare.
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"Uffe Kousgaard" <[EMAIL PROTECTED]>
01.09.2005 18:20
Pour : "Mapinfo-L" <[email protected]>
cc :
Objet : Re: MI-L Réf. : MI-L save window & print resolution
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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