Image manipulation with Mathematica - linux

Question

I've created this theme after my previous post. I can't run the following code (written by #belisarius):
a = Image["path/file.png"]
b = Image#ArrayPad[ImageData#a, {{40, 0}, {40}, {0}}, {1, 1, 1}];
f[image_, angleMult_] := ImageForwardTransformation[image, (
fi = ArcTan[Abs[#[[2]]/(#[[1]] - .5)]];
fi1 = angleMult fi (#[[1]]^2 + #[[2]]^2)/2;
{(1/2 - Sin[fi1] #[[2]] - Cos[fi1]/2 +
Cos[fi1] #[[1]]), -Sin[fi1]/2 + Sin[fi1] #[[1]] +
Cos[fi1] #[[2]]}) &]
t = Table[f[b, x], {x, 0, .2, .02}];
t1 = Reverse#t;
Export["anim.gif", Join[t, t1], "DisplayDurations" -> .15];
Import["anim.gif", "Animation"]
Here is a list of errors:
ArrayPad::depth: Padding amount {{40,0},{40},{0}} should specify padding in no more than the number of dimensions in array {{1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,0.996078,0.984314,<<142>>},<<49>>,<<145>>}. >>
Image::imgarray: The specified argument ArrayPad[{{1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,0.996078,0.984314,<<142>>},<<49>>,<<145>>},{{40,0},{40},{0}},{1,1,1}] should be an array of rank 2 or 3 with machine-sized numbers. >>
ImageForwardTransformation::imginv: Expecting an image or graphics instead of Image[ArrayPad[{{1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,0.996078,0.984314,<<142>>},<<49>>,<<145>>},{<<1>>},{1,1,1}]]. >>
General::stop: Further output of ImageForwardTransformation::imginv will be suppressed during this calculation. >>
Rasterize::bigraster: Not enough memory available to rasterize ImageForwardTransformation expression. >>
General::stop: Further output of Rasterize::bigraster will be suppressed during this calculation. >>
I'm using Mathematica 8 under Linux.

Answer 1

I think I got it.
The code above is for color images (3 channels) and it seems you are trying to run it over a B&W image (1 channel).
Either use a color image or replace the second line by:
b = Image#ArrayPad[ImageData#a, {{40, 0}, {40}}, 1];
Here is the result for your image using the above replacement as:
a = Binarize[Image["path/file.png"]]
b = Image#ArrayPad[ImageData#a, {{40, 0}, {40}}, 1];