Examples from "Usage" webpages produce errors

Hi,

When trying some examples from the IM Usage website, they
result in
errors.  E.g. (from Usage/canvas/#gradient):

$ convert -size 100x100 xc: 
            -fx 'xx=i/w-.5; yy=j/h-.5; rr=sqrt(xx*xx+yy*yy);
1-rr*1.42' 
            gradient_fx_radial.gif
convert: unable to parse expression `xx'.

$ convert -size 100x100 xc: 
            -fx 'xx=i/w-.5; yy=j/h-.5; rr=xx*xx+yy*yy;
1-rr*4' 
            gradient_fx_spherical.gif
convert: unable to parse expression `xx'.


Are the examples wrong, or...?

--
--    Jos Vos <josxos.nl>
--    X/OS Experts in Open Systems BV   |   Phone: +31 20
6938364
--    Amsterdam, The Netherlands        |     Fax: +31 20
6948204
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-users

You have to replace the apostrophes with quotation marks

convert -size 100x100 xc: -fx "xx=i/w-.5; yy=j/h-.5;
rr=sqrt(xx*xx+yy*yy);
1-rr*1.42" gradient_fx_radial.gif

Don't ask me why!

Chris Roberts

> -----Original Message-----
> From: magick-users-bouncesimagemagick.org 
> [mailto:magick-users-bouncesimagemagick.org] On Behalf
Of Jos Vos
> Sent: 09 March 2007 11:47
> To: magick-usersimagemagick.org
> Subject: [magick-users] Examples from "Usage"
webpages produce errors
> 
> 
> Hi,
> 
> When trying some examples from the IM Usage website,
they 
> result in errors.  E.g. (from Usage/canvas/#gradient):
> 
> $ convert -size 100x100 xc: 
>             -fx 'xx=i/w-.5; yy=j/h-.5;
rr=sqrt(xx*xx+yy*yy); 
> 1-rr*1.42' 
>             gradient_fx_radial.gif
> convert: unable to parse expression `xx'.
> 
> $ convert -size 100x100 xc: 
>             -fx 'xx=i/w-.5; yy=j/h-.5; rr=xx*xx+yy*yy;
1-rr*4' 
>             gradient_fx_spherical.gif
> convert: unable to parse expression `xx'.
> 
> 
> Are the examples wrong, or...?
> 
> --
> --    Jos Vos <josxos.nl>
> --    X/OS Experts in Open Systems BV   |   Phone: +31
20 6938364
> --    Amsterdam, The Netherlands        |     Fax: +31
20 6948204
> _______________________________________________
> Magick-users mailing list
> Magick-usersimagemagick.org 
> http://studio.imagemagick.org/mailman/listinfo/magick
-users

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Jos Vos on  wrote...
| Hi,
| 
| When trying some examples from the IM Usage website, they
result in
| errors.  E.g. (from Usage/canvas/#gradient):
| 
| $ convert -size 100x100 xc: 
|             -fx 'xx=i/w-.5; yy=j/h-.5;
rr=sqrt(xx*xx+yy*yy); 1-rr*1.42' 
|             gradient_fx_radial.gif
| convert: unable to parse expression `xx'.
| 
| $ convert -size 100x100 xc: 
|             -fx 'xx=i/w-.5; yy=j/h-.5; rr=xx*xx+yy*yy;
1-rr*4' 
|             gradient_fx_spherical.gif
| convert: unable to parse expression `xx'.
| 
| 
| Are the examples wrong, or...?
| 
No your IM is too old.

The xx= assignment was one of the later additions to IM -fx
expressions
allowing for much more complex problems to be solved and
simpler
handling of control constants.

Assignments was added in IM v6.2.10

See IM Exmaples, -fx overview
  http:/
/www.imagemagick.org/Usage/transform/#fx

  Anthony Thyssen ( System Programmer )    <A.Thyssengriffith.edu.au>
 -----------------------------------------------------------
------------------
   UNIX was never designed to keep people from doing stupid
things, because
   that policy would also keep them from doing clever
things.  -- Doug Gwyn
 -----------------------------------------------------------
------------------
     Anthony's Home is his Castle     http://www.cit.gu.
edu.au/~anthony/
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