Groups > comp.graphics.apps.gnuplot > #1589

Re: plotting data over png image

Newsgroups	comp.graphics.apps.gnuplot
Date	2013-01-28 19:31 -0800
References	<b429be56-fbd3-4b6e-b8e2-b252ac568f0a@googlegroups.com> <ke4p58$7eu$1@dont-email.me>
Message-ID	<b1afe6f2-fa95-4ad2-a5ac-e60ed3b31cd4@googlegroups.com> (permalink)
Subject	Re: plotting data over png image
From	awimagic@gmail.com

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On Monday, January 28, 2013 8:22:28 AM UTC+5:30, sfeam wrote:
> 
> You can assign an origin and scale to the PNG image using the keywords
> 
> origin=		coordinates of the lower left corner
> 
> dx=		units per pixel
> 
> dy=		units per pixel
> 
> 
> 
> The online demo collection has this example:
> 
> 
> 
>     http://gnuplot.sourceforge.net/demo/barchart_art.html
> 

excellent! many thanks 

p [-1:15][-1:15] 'cave.png' binary filetype=png origin=(-1,-1) dx=0.032 dy=0.032 w rgbimage, 'all.txt' u 2:3 w l

achieves what i want. except the overlaying of a grid on top. guess the png is hiding the grid lines.

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plotting data over png image awimagic@gmail.com - 2013-01-27 03:47 -0800
  Re: plotting data over png image sfeam <sfeam@users.sourceforge.net> - 2013-01-27 18:52 -0800
    Re: plotting data over png image awimagic@gmail.com - 2013-01-28 19:31 -0800

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