(PECL imagick 2, PECL imagick 3)
Imagick::previewImages — Quickly pin-point appropriate parameters for image processing
public Imagick::previewImages ( int $preview ) : bool
Tiles 9 thumbnails of the specified image with an image processing operation applied at varying strengths. This is helpful to quickly pin-point an appropriate parameter for an image processing operation.
preview
Preview type. See Preview type constants
Returns true on success.
Throws ImagickException on error.
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https://www.php.net/manual/en/imagick.previewimages.php