Re: [Gimp-user] Math graphics
On Dec 21, 2007 4:49 PM, Brian Vanderburg II [EMAIL PROTECTED] wrote:
Is there a plugin (or high speed script-fu) that would allow me to enter
a math expression and from it create the pixel data also given a
'viewport range'.
XMin: -1
XMax 1
YMin -1
Ymax: 1
UseGraient: no
Expr: red=sin(2*pi*x*y)/2+0.5;green=...,...
or
UseGradient: yes
Simple gradient application is best done using 'gradient map' filter.
Although since you're running windows, that may be slower.
Expr: offset=sin(2*pi*x*y)
Or something like that. I imagine a script-fu could be done that could
take the viewport, gradient, and expression and somehow execute the
expression and plot the pixels, but it seems like script-fu would be
somewhat slow. I've created my own expression evaluation library which
would easily provide all the math support I need, but don't know much
about making GIMP plugins and since I'm only on Windows now I've had
problems trying to compile glib/gtk under msys/mingw, plus it is C++
except an older version which is C.
Brian Vanderburg II
I recommend using PyGimp in combination with Numpy.
for example, here is some python source code for the first 'red' example
# it is assumed that x,y are 2d arrays
# like
# x =
# 012
# 012
# 012
#
# y =
# 000
# 111
# 222
red = numpy.sin((2 * pi) * x * y) / 2 +0.5
# calculate green, blue.. here
# ..
# expand the range (0..1) - (0..255) and convert to 8bit integers
# you would need to account for the possibility of an alpha channel here, too.
result = numpy.hstack ( (red * 255).astype('B'), (green *
255).astype('B'), (blue * 255).astype('B'))
# result.tostring() can now be written to a GIMP pixel region
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Re: [Gimp-user] Math graphics
Hi, On Fri, 2007-12-21 at 01:19 -0500, Brian Vanderburg II wrote: Is there a plugin (or high speed script-fu) that would allow me to enter a math expression and from it create the pixel data also given a 'viewport range'. Yes, there is gluas: http://pippin.gimp.org/plug-ins/gluas/ Sven ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Math graphics
On Fri, 21 Dec 2007 01:19:21 -0500, Brian Vanderburg II [EMAIL PROTECTED] wrote: Is there a plugin (or high speed script-fu) that would allow me to enter a math expression and from it create the pixel data also given a 'viewport range'. Have a look at MathMap: http://www.complang.tuwien.ac.at/schani/mathmap/ It can process existing images using arbitrarily complex mathematical formulas. It can also create new images from scratch, as you can see on the examples page with the moire pattern or the Mandelbrot fractal. It comes with a tutorial and an extensive reference manual. -Raphaël ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Math graphics
Is there a plugin (or high speed script-fu) that would allow me to enter a math expression and from it create the pixel data also given a 'viewport range'. XMin: -1 XMax 1 YMin -1 Ymax: 1 UseGraient: no Expr: red=sin(2*pi*x*y)/2+0.5;green=...,... or UseGradient: yes Expr: offset=sin(2*pi*x*y) Or something like that. I imagine a script-fu could be done that could take the viewport, gradient, and expression and somehow execute the expression and plot the pixels, but it seems like script-fu would be somewhat slow. I've created my own expression evaluation library which would easily provide all the math support I need, but don't know much about making GIMP plugins and since I'm only on Windows now I've had problems trying to compile glib/gtk under msys/mingw, plus it is C++ except an older version which is C. Brian Vanderburg II ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
