We need to have a raster eps or pdf that has a dpi of 300. Reading through the old list entries it appears that ps.map had a hard coded limit of 75 dpi.
Is this possible to change?
Or is there some way to get an eps file that Adobe Illustrator thinks is 300 dpi?
–
Gerald Nelson
1612 Ballard St.
Silver Spring, MD 20910
217-390-7888 (cell)
On Sat, Jul 14, 2012 at 3:14 AM, Gerald Nelson <nelson.gerald@gmail.com> wrote:
We need to have a raster eps or pdf that has a dpi of 300. Reading through
the old list entries it appears that ps.map had a hard coded limit of 75
dpi.
The spatial detail represented in the output of ps.map is defined by
the resolution of the current computational region. You can test that
by changing the resolution of the current computational region.
If you want to edit eps files created by ps.map in other software,
that other software usually asks for the dpi to use. If that other
software does not ask for the dpi settings, use a different software
that can import eps files 
When you convert eps to pdf, e.g with ghostscript, you can control the
dpi settings with -dPDFSETTINGS. Max dpi is here 300.
Is this possible to change?
You might need to check the manual of the software you use to convert
eps to pdf.
Or is there some way to get an eps file that Adobe Illustrator thinks is 300
dpi?
I don't know Adobe Illustrator, but Gimp asks you for the dpi when
importing an eps file. That is, you can import the same eps file with
different dpi's to GIMP and decide what meets your requirements best.
Then you could save the file in a format that Adobe Illustrator
understands and where Adobe Illustrator does not automatically change
the resolution.
HTH,
Markus M
May this post help you :
http://lists.osgeo.org/pipermail/grass-dev/2011-December/057095.html
Good luck,
Vincent
Le samedi 14 juillet 2012 à 20:14 +0200, Markus Metz a écrit :
On Sat, Jul 14, 2012 at 3:14 AM, Gerald Nelson <nelson.gerald@gmail.com> wrote:
> We need to have a raster eps or pdf that has a dpi of 300. Reading through
> the old list entries it appears that ps.map had a hard coded limit of 75
> dpi.The spatial detail represented in the output of ps.map is defined by
the resolution of the current computational region. You can test that
by changing the resolution of the current computational region.If you want to edit eps files created by ps.map in other software,
that other software usually asks for the dpi to use. If that other
software does not ask for the dpi settings, use a different software
that can import eps filesWhen you convert eps to pdf, e.g with ghostscript, you can control the
dpi settings with -dPDFSETTINGS. Max dpi is here 300.
>
> Is this possible to change?
You might need to check the manual of the software you use to convert
eps to pdf.
>
> Or is there some way to get an eps file that Adobe Illustrator thinks is 300
> dpi?I don't know Adobe Illustrator, but Gimp asks you for the dpi when
importing an eps file. That is, you can import the same eps file with
different dpi's to GIMP and decide what meets your requirements best.
Then you could save the file in a format that Adobe Illustrator
understands and where Adobe Illustrator does not automatically change
the resolution.HTH,
Markus M
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On Fri, Jul 13, 2012 at 09:14:13PM -0400, we recorded a bogon-computron collision of the <nelson.gerald@gmail.com> flavor, containing:
We need to have a raster eps or pdf that has a dpi of 300. Reading through
the old list entries it appears that ps.map had a hard coded limit of 75
dpi.
Have you tried it? I believe that hard-coded limit was taken out years ago.
(as I recall, I may even have been the person who complained about it on
this list, as I had a big raster I needed to render on a large-format printer,
and this hard-coded limit was in the way.)
In fact, I'm pretty sure that this limitation is long gone. Look at the
documentation for a current version of ps.map, and it'll tell you that raster
resolution is controlled by the region settings.
What old list entries were you reading?
--
Tom Russo KM5VY SAR502 DM64ux http://www.swcp.com/~russo/
Tijeras, NM QRPL#1592 K2#398 SOC#236 http://kevan.org/brain.cgi?DDTNM
"And, isn't sanity really just a one-trick pony anyway? I mean all you get is
one trick, rational thinking, but when you're good and crazy, oooh, oooh,
oooh, the sky is the limit!" --- The Tick
We eventually figured out about the region settings being key. But it would have made my life much easier to be able to specify a dpi setting. Adobe photoshop/illustrator folks just seem to live by this measure.
On Tue, Jul 17, 2012 at 7:13 PM, Tom Russo <russo@bogodyn.org> wrote:
On Fri, Jul 13, 2012 at 09:14:13PM -0400, we recorded a bogon-computron collision of the <nelson.gerald@gmail.com> flavor, containing:
We need to have a raster eps or pdf that has a dpi of 300. Reading through
the old list entries it appears that ps.map had a hard coded limit of 75
dpi.Have you tried it? I believe that hard-coded limit was taken out years ago.
(as I recall, I may even have been the person who complained about it on
this list, as I had a big raster I needed to render on a large-format printer,
and this hard-coded limit was in the way.)In fact, I’m pretty sure that this limitation is long gone. Look at the
documentation for a current version of ps.map, and it’ll tell you that raster
resolution is controlled by the region settings.What old list entries were you reading?
–
Tom Russo KM5VY SAR502 DM64ux http://www.swcp.com/~russo/
Tijeras, NM QRPL#1592 K2#398 SOC#236 http://kevan.org/brain.cgi?DDTNM
“And, isn’t sanity really just a one-trick pony anyway? I mean all you get is
one trick, rational thinking, but when you’re good and crazy, oooh, oooh,
oooh, the sky is the limit!” — The Tick
–
Gerald Nelson
1612 Ballard St.
Silver Spring, MD 20910
217-390-7888 (cell)
Tom wrote:
Have you tried it? I believe that hard-coded limit was taken out years
ago. (as I recall, I may even have been the person who complained
about it on this list, as I had a big raster I needed to render on a
large-format printer, and this hard-coded limit was in the way.)In fact, I'm pretty sure that this limitation is long gone. Look at the
documentation for a current version of ps.map, and it'll tell you that
raster resolution is controlled by the region settings.
Indeed it is long gone many releases ago. AFAIK the limit was 300M cells
for greyscale and 100M cells for RGB rasters.
as others have mentioned, defeating default ghostscript options often
solves the 72dpi PDF hardcopy problem. See:
http://grass.osgeo.org/wiki/Ps.map_scripts#Converting_PostScript_to_PDF
ps2pdf -dPDFSETTINGS=/prepress -r1200 filename.ps
(72dpi is usually fine for the screen or for projector presentations, but
not the printed page)
and from the ps.map man page:
The resolution and extent of raster maps plotted with ps.map
are controlled by the current region settings via the g.region
module. The output filesize is largely a function of the region
resolution, so special care should be taken if working with
large raster datasets. For example if the desired output is US-
Letter sized paper at 300dpi, with 1" margins and the raster
filling the entire page, the usable area on the page will be
6.5" x 9", which at 300 dots/inch is equivalent to a region of
1950 columns x 2700 rows (see "g.region -p"). Any higher reso-
lution settings will make the output file larger, but with a
consumer printer you probably won't be able to resolve any bet-
ter detail in the hardcopy.
regards,
Hamish