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I know how to add a new thumbnail size to my custom plugin. But i want to know if is possible to restrict de new size only to a certain custom post type?

Thanks in advance.

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You cant without editing core files but you can name it any way you want so you can call it from you plugin:

if ( function_exists( 'add_image_size' ) ) { 
    add_image_size( 'my-plugin-thumb', 220, 180, true );
}

and call it

if ( has_post_thumbnail() ) { 
    the_post_thumbnail( 'my-plugin-thumb' );
}

it's not perfect but its something.

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