Plugin / GS Only PDF Preview

Three plugin-specific filters are available: gopp_editor_set_resolution sets the resolution of the PDF preview. gopp_editor_set_page sets the page to render for the PDF preview. gopp_image_gs_cmd_path short-circuits the determination of the path of the Ghostscript executable on your server. The gopp_editor_set_resolution filter is an analogue of the standard wp_editor_set_quality filter mentioned above, and allows one to override the default resolution of 128 DPI used for the PDF preview. For instance, in your theme’s “functions.php”: function mytheme_gopp_editor_set_resolution( $resolution, $filename ) { return 100; } add_filter( 'gopp_editor_set_resolution', 'mytheme_gopp_editor_set_resolution', 10, 2 ); Similarly the gopp_editor_set_page filter allows one to override the default of rendering the first page: function mytheme_gopp_editor_set_page( $page, $filename ) { return 2; // Render the second page instead. } add_filter( 'gopp_editor_set_page', 'mytheme_gopp_editor_set_page', 10, 2 ); The gopp_image_gs_cmd_path filter is necessary if your Ghostscript installation is in a non-standard location and the plugin fails to determine where it is (if this happens you’ll get a Warning: no Ghostscript! notice on activation): function mytheme_gopp_image_gs_cmd_path( $gs_cmd_path, $is_win ) { return $is_win ? 'D:\\My Ghostscript Location\\bin\\gswin32c.exe' : '/my ghostscript location/gs'; } add_filter( 'gopp_image_gs_cmd_path', 'mytheme_gopp_image_gs_cmd_path', 10, 2 ); The filter can also be used just for performance reasons, especially on Windows servers to save searching the registry and directories. Note that the value of gs_cmd_path is cached as a transient by the plugin for performance reasons, with a lifetime of one day. You can clear it by de-activating and re-activating the plugin, or by manually calling the clear method of the Ghostscript Image Editor: function mytheme_gopp_init() { if ( class_exists( 'GOPP_Image_Editor_GS' ) ) { GOPP_Image_Editor_GS::clear(); } } add_filter( 'init', 'mytheme_gopp_init' ); or for WP-CLI users: wp transient delete gopp_image_gs_cmd_path