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From: Zhiliang Hu on 5 May 2008 22:28 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
From: xhoster on 5 May 2008 22:43 Zhiliang Hu <zhilianghu(a)gmail.com> wrote: > 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 -- -------------------- http://NewsReader.Com/ -------------------- The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
From: zentara on 6 May 2008 06:15 On Mon, 5 May 2008 20:28:15 -0700 (PDT), Zhiliang Hu <zhilianghu(a)gmail.com> wrote: >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
From: Zhiliang Hu on 6 May 2008 10:29 Many thanks for all your hints. That'll be useful. -- Zhiliang
From: zentara on 7 May 2008 08:22
On Tue, 6 May 2008 08:29:09 -0700 (PDT), Zhiliang Hu <zhilianghu(a)gmail.com> wrote: >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 |