How to use SparseColor from PerlMagick?

[joew]

Hello,

I am somewhat confused about how to use the SparseColor method.

I would like to do the aequivalent of

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convert [...] -sparse-color barycentric "0,0 yellow -%w,%h yellow  %w,%h limegreen" [...]

I have tried:

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$image->SparseColor(method=>"Barycentric", points=>"0,0 yellow -%w,%h yellow  %w,%h limegreen");

and

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$image->SparseColor(method=>"Barycentric", "0,0 yellow -%w,%h yellow  %w,%h limegreen");

and

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$image->SparseColor(method=>["Barycentric", "0,0 yellow -%w,%h yellow  %w,%h limegreen"]);

Any hints how to properly use this method?