[magick-users] Examples from "Usage" webpages produce errors

[Christopher Roberts]

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-bounces at imagemagick.org 
> [mailto:magick-users-bounces at imagemagick.org] On Behalf Of Jos Vos
> Sent: 09 March 2007 11:47
> To: magick-users at imagemagick.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 <jos at xos.nl>
> --    X/OS Experts in Open Systems BV   |   Phone: +31 20 6938364
> --    Amsterdam, The Netherlands        |     Fax: +31 20 6948204
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