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Posted by Zhiliang Hu on May 5, 2008, 11:28 pm
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I use GD::Image to create figures. Here is an example:
http://sphinx.vet.unimelb.edu.au/QTLdb/tmp/map490151833.png
For publication purposes we need high resolution pictures. I am
seeking expert advice as how can I improve the resolution?
Thanks in advance!
Zhiliang
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Posted by xhoster on May 5, 2008, 11:43 pm
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> I use GD::Image to create figures. Here is an example:
> http://sphinx.vet.unimelb.edu.au/QTLdb/tmp/map490151833.png
>
> For publication purposes we need high resolution pictures. I am
> seeking expert advice as how can I improve the resolution?
Hi Zhiliang,
The resolution of a png is one pixel per pixel. You can't get any higher
than that! You should be able to make the entire image larger, for example
by specifying a larger array when you call new on your GD object.
Currently it is 360x402, you could try doubling each.
Or you may need to switch to something other than png, like svg using
GD::SVG.
Xho
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Posted by zentara on May 6, 2008, 7:15 am
Please log in for more thread options On Mon, 5 May 2008 20:28:15 -0700 (PDT), Zhiliang Hu
>I use GD::Image to create figures. Here is an example:
>http://sphinx.vet.unimelb.edu.au/QTLdb/tmp/map490151833.png
>
>For publication purposes we need high resolution pictures. I am
>seeking expert advice as how can I improve the resolution?
>
>Thanks in advance!
>
>Zhiliang
Use a camera with more mega-pixels, and set it to the highest
resolution. ( Usually the largest picture, allowing fewest pictures
in storage).
If you take a low resolution photo, and use a program to make it larger,
each pixel will be duplicated with the same color, to accomodate the
larger size. So the picture will be larger, but the resolution will not
improve.
Resolution comes from the camera's megapixel count and settings.
zentara
--
I'm not really a human, but I play one on earth.
http://zentara.net/japh.html
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Posted by Zhiliang Hu on May 6, 2008, 11:29 am
Please log in for more thread options Many thanks for all your hints. That'll be useful.
--
Zhiliang
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Posted by zentara on May 7, 2008, 9:22 am
Please log in for more thread options On Tue, 6 May 2008 08:29:09 -0700 (PDT), Zhiliang Hu
>Many thanks for all your hints. That'll be useful.
I just looked at your sample output, and since it's lines and
text, you could use the Scalable Vector Graphics format, or
.svg
GD has svg output with the module
http://search.cpan.org/~twh/GD-SVG-0.28/SVG.pm
SVG files look like xml, and will change resolution
automatically to adjust to window size.
Google for svg for more info.
zentara
--
I'm not really a human, but I play one on earth.
http://zentara.net/japh.html
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