[Mapserver-users] Change Output Image Resolution
Ed McNierney
ed at topozone.com
Fri Apr 11 10:51:52 EDT 2003
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Stefan -
=20
Those two options are the same thing!
=20
If you take a fixed geographic area (say 10 kilometers square), and =
generate a 1,000 x 1,000 pixel map, and then "produce a bigger image" by =
creating a 10,000 x 10,000 pixel map, if you print the two at the same =
physical size you'll get one that is a "high resolution" map and one =
that's "low resolution". There's no difference. The only thing you =
need to be careful about is using fixed-sized bitmap fonts or symbols. =
You need to make sure everything on the map is scalable, and if you're =
going to use bitmaps you will need two versions, one to match each =
resolution.
=20
To put it another way, if you had a 10-cm x 10-cm print of a 2,000-pixel =
square image, and a 4-cm x 4-cm "high resolution" print of the same =
image, the first would be 200 pixels per cm, and the second would be a =
"high resolution" 500 pixels per cm, but the image is the same thing.
=20
- Ed
Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA 01863
ed at topozone.com
(978) 251-4242=20
-----Original Message-----
From: Stefan Schwarzer [mailto:stefan.schwarzer at grid.unep.ch]
Sent: Friday, April 11, 2003 10:33 AM
To: mapserver-users at lists.gis.umn.edu
Subject: [Mapserver-users] Change Output Image Resolution
Hi all,
I would like to create images with a higher resolution for printing. But =
I don't like to just produce a bigger image and then reduce the =
print-size and thus raise the image resolution with the help of an image =
processing software.
The only thread I found concerning this subject was this one: =
http://mapserver.gis.umn.edu/data2/wilma/mapserver-users/0104/msg00010.ht=
ml=20
Has anything changed since then which facilitates the production of a =
high resolution images?
Best wishes,
Stefan
_______________________________________
Stefan Schwarzer
Consultant on GEO
UNEP/DEWA/GRID-Geneva
Chemin des Anemones 11
CH - 1219 Chatelaine
Switzerland
Tel: (+41) 22.917.83.49
Fax: (+41) 22.917.80.29
Email: stefan.schwarzer at grid.unep.ch
Internet: http://geodata.grid.unep.ch/
_______________________________________=20
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<DIV><SPAN class=3D390094714-11042003><FONT face=3DArial color=3D#0000ff =
size=3D2>Stefan=20
-</FONT></SPAN></DIV>
<DIV><SPAN class=3D390094714-11042003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D390094714-11042003><FONT face=3DArial color=3D#0000ff =
size=3D2>Those=20
two options are the same thing!</FONT></SPAN></DIV>
<DIV><SPAN class=3D390094714-11042003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D390094714-11042003><FONT face=3DArial color=3D#0000ff =
size=3D2>If you=20
take a fixed geographic area (say 10 kilometers square), and generate a =
1,000 x=20
1,000 pixel map, and then "produce a bigger image" by creating a 10,000 =
x 10,000=20
pixel map, if you print the two at the same physical size you'll get one =
that is=20
a "high resolution" map and one that's "low resolution". There's =
no=20
difference. The only thing you need to be careful about is using=20
fixed-sized bitmap fonts or symbols. You need to make sure =
everything on=20
the map is scalable, and if you're going to use bitmaps you will need =
two=20
versions, one to match each resolution.</FONT></SPAN></DIV>
<DIV><SPAN class=3D390094714-11042003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D390094714-11042003><FONT face=3DArial color=3D#0000ff =
size=3D2>To put=20
it another way, if you had a 10-cm x 10-cm print of a 2,000-pixel square =
image,=20
and a 4-cm x 4-cm "high resolution" print of the same image, the first =
would be=20
200 pixels per cm, and the second would be a "high resolution" 500 =
pixels per=20
cm, but the image is the same thing.</FONT></SPAN></DIV>
<DIV><SPAN class=3D390094714-11042003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D390094714-11042003> <FONT =
face=3DArial=20
color=3D#0000ff size=3D2>- Ed</FONT></SPAN></DIV>
<DIV><SPAN class=3D390094714-11042003>
<P><FONT size=3D2>Ed McNierney<BR>President and Chief =
Mapmaker<BR>TopoZone.com /=20
Maps a la carte, Inc.<BR>73 Princeton Street, Suite 305<BR>North =
Chelmsford,=20
MA 01863<BR>ed at topozone.com<BR>(978) 251-4242 =
</FONT></P></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> Stefan Schwarzer=20
[mailto:stefan.schwarzer at grid.unep.ch]<BR><B>Sent:</B> Friday, April =
11, 2003=20
10:33 AM<BR><B>To:</B> =
mapserver-users at lists.gis.umn.edu<BR><B>Subject:</B>=20
[Mapserver-users] Change Output Image =
Resolution<BR><BR></FONT></DIV>Hi=20
all,<BR><BR>I would like to create images with a higher resolution for =
printing. But I don't like to just produce a bigger image and then =
reduce the=20
print-size and thus raise the image resolution with the help of an =
image=20
processing software.<BR><BR>The only thread I found concerning this =
subject=20
was this one: <A=20
=
href=3D"http://mapserver.gis.umn.edu/data2/wilma/mapserver-users/0104/msg=
00010.html"=20
=
eudora=3D"autourl">http://mapserver.gis.umn.edu/data2/wilma/mapserver-use=
rs/0104/msg00010.html</A>=20
<BR><BR>Has anything changed since then which facilitates the =
production of a=20
high resolution images?<BR><BR>Best=20
wishes,<BR><BR>Stefan<BR><BR><BR><X-SIGSEP>
<P></X-SIGSEP><FONT=20
=
size=3D3><X-TAB> </X-TAB>_=
______________________________________<BR><BR></FONT><FONT=20
=
size=3D2><X-TAB> </X-TAB><=
B>Stefan=20
=
Schwarzer<BR></B><X-TAB> <=
/X-TAB>Consultant=20
on=20
=
GEO<BR><BR><X-TAB> </X-TAB=
>UNEP/DEWA/GRID-Geneva<BR><X-TAB> &nbs=
p; </X-TAB>Chemin=20
des Anemones=20
=
11<BR><X-TAB> </X-TAB>CH =
- 1219=20
=
Chatelaine<BR><X-TAB> </X-=
TAB>Switzerland<BR><BR><X-TAB> &=
nbsp;</X-TAB>Tel:=20
(+41)=20
=
22.917.83.49<BR><X-TAB> </=
X-TAB>Fax:=20
(+41)=20
=
22.917.80.29<BR><BR><X-TAB> &nbs=
p;</X-TAB>Email:=20
=
stefan.schwarzer at grid.unep.ch<BR><X-TAB> &nb=
sp; </X-TAB>Internet:=20
<A href=3D"http://geodata.grid.unep.ch/"=20
eudora=3D"autourl">http://geodata.grid.unep.ch/</A><BR></FONT><FONT=20
=
size=3D3><X-TAB> </X-TAB>_=
______________________________________</FONT>=20
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