<?php 
        $handle = imagick_readimage( getcwd() . "/image.jpg" ) ;
        if ( imagick_iserror( $handle ) )
        {
                $reason      = imagick_failedreason( $handle ) ;
                $description = imagick_faileddescription( $handle ) ;

                print "handle failed!<BR>\nReason: $reason<BR>\nDescription: $description<BR>\n" ;
        exit ;
        }

    imagick_negate( $handle, 0 ) ;
    //
    //  or, imagick_negate( $handle, 1 ).  1 and 0 are the only valid
    //  values for the second parameter.  1 means that only the gray scale
    //  within the image should be negated.
    //

        if ( !imagick_writeimage( $handle, getcwd() . "/new_image.jpg" ) )
        {
                $reason      = imagick_failedreason( $handle ) ;
                $description = imagick_faileddescription( $handle ) ;

                print "imagick_writeimage() failed<BR>\nReason: $reason<BR>\nDescription: $description<BR>\n" ;
        exit ;
        }

        print "Done!<BR>\n" ;
?>