add attachment meta, and remove pinterest pinit button from those images with meta box checked...

pinit_onlyon.php

<?php
/**
 * Plugin Name: Pinit Only On Selected Media
 * Plugin URI: http://www.rayflores.com/plugins/pinit-onlyon/ 
 * Version: 1.0
 * Author: Ray Flores
 * Author URI: http://www.rayflores.com 
 * Description: Adds ability to select media attachments to be unpinned.
 * Requires at least: 4.0
 * Tested up to: 4.1
 * screenshot of metabox: http://screencast.com/t/4o12zuTB
 * screenshot of image with no pinit button:  http://screencast.com/t/GvDre4Beh  
 */
 // first lets add a meta_box to the attachment area
function attachment_fields_to_edit_pinit_only_image( $form_fields, $post ) {
    $checked = get_post_meta( $post->ID, 'pinitonly', false ) ? 'checked="checked"' : '';
    $form_fields['pinitonly'] = array(
        'label' => 'Remove Pin it ?',
        'input' => 'html',
        'html'  => "<input type=\"checkbox\"
            name=\"attachments[{$post->ID}][pinitonly]\"
            id=\"attachments[{$post->ID}][pinitonly]\"
            value=\"1\" {$checked}/>",
		'helps' => 'Do you want the Pinit Pro button to appear on this image?'
		);
    return $form_fields;

}
add_filter( 'attachment_fields_to_edit', 'attachment_fields_to_edit_pinit_only_image', null, 2 );
// then let's save it to the db 
function attachment_fields_to_save_pinit_only_image($post, $attachment) {
    if(isset($attachment['pinitonly']))
    {
		
        update_post_meta($post['ID'], 'pinitonly', 1);
    } else {
        update_post_meta($post['ID'], 'pinitonly', 0);
    }
	return $post;
}
add_filter( 'attachment_fields_to_save', 'attachment_fields_to_save_pinit_only_image', null, 2 );

//add_action('wp_footer','remove_pinit_from_image',100);
add_filter( 'the_content', 'remove_pinit_from_image', 100 );
function remove_pinit_from_image($content){
	global $pib_options, $post;
	$postID = $post->ID;
	
	
	 if ( is_page() || is_singular() )
	 {
		 

				
			$imgPattern = "/<img([^\>]*?)>/i";

			if ( preg_match_all( $imgPattern, $content, $imgTags )) {
				foreach ( $imgTags[0] as $imgTag ) {
					preg_match( '@src="([^"]+)"@' , $imgTag, $match );

					$image_src = $match[1];

					// will return /images/image.jpg
					//echo $image_src;
					$imgID = get_attachment_id_from_src ($image_src);
					
					
				
					
				$img_meta = get_post_meta($imgID,'pinitonly',true);
			
			
				if ($img_meta != 0){
					// you found the media items with "remove pin it option" !! 

			//Skip adding hover effect if image contains certain classes
			$skipTheseClasses = 'pib-hover-img,pin-it-btn-custom-img,pib-nohover';

			//Add user-added CSS classes to skip hovering on
			if ( ! empty( $pib_options['hover_btn_ignore_classes'] ) ) {
				$skipTheseClasses .= ',' . $pib_options['hover_btn_ignore_classes'];
			}

			//Convert comma delimiters to pipes for now to work with current regex
			$skipTheseClasses = str_replace( ',', '|', $skipTheseClasses );

			if ( ! preg_match( '/' . $skipTheseClasses . '/i', $imgTag ) ) {

				// The ignored classes shouldn't have pib-hover-img class added to them.
				if ( ! preg_match( '/class=/i', $imgTag ) ) {
					//image is good to go -- add the hover class
					$pattern = $imgPattern;
					$replacement = '<img class="pib-nohover" $1>';
				}
				else {
					//image matches an class to skip, so don't add hover
					$pattern     = "/<img(.*?)class=('|\")([A-Za-z0-9 \/_\.\~\:-]*?)('|\")([^\>]*?)>/i";
					$replacement = '<img$1class=$2$3 pib-nohover$4$5>';
				}

				$replacedImgTag = preg_replace( $pattern, $replacement, $imgTag );
				$content        = str_replace( $imgTag, $replacedImgTag, $content );
			} // end if ( ! preg_match( '/' . $skipTheseClasses . '/i', $imgTag )
				} // end if $img_meta === 1
		} // end foreach
	} // end if ( preg_match_all( $imgPattern, $content, $imgTags ))
	
    return $content;
		} // end if is_page()	
				
			 
} // end function
	

function get_attachment_id_from_src ($image_src) {

		global $wpdb;
		$query = "SELECT ID FROM {$wpdb->posts} WHERE guid='$image_src'";
		$id = $wpdb->get_var($query);
		return $id;

	}

Cool, just needs a bit of formatting ;-)

There it is https://gist.github.com/greguly/91c16a39c56f3b00ed8d