[magick-users] How to make a perspective from an image?

[Ross Presser]

See http://www.imagemagick.org/Usage/distorts/#perspective

Briefly, perspective transformation is *not* an affine transformation.
Affine transformations include only scaling, shearing, rotating and
translating, none of which can alter the ratio of lengths in the way
that perspective requires.  Therefore the -affine option isn't going
to cut it.  You have to do heavier lifting using the -fx option, using
numbers calculated using the perl script on that page (or a similar
method).

(I ran into a similar wall several years ago with Postscript.)

On 6/18/07, Alberto Simões <hashashin at gmail.com> wrote:
> Hi
>
> I am trying to modify an image putting it in a perspective-like
> position, like this:
>
>
>   |\
>   |  \
>   |    \
>   |     |
>   |     |
>   |    /
>   |  /
>   |/
>
> I tried to use the -affine option, with a matrix I got with
> 'transform' tool on gimp, but I couldn't get this type of
> modification.
>
> Does anybody can help me with this?
> Thank you
> Alberto
>
> --
> Alberto Simões
>
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