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如何在wordpress3中锐化帖子缩略图

  •  0
  • Mickel  · 技术社区  · 14 年前

    在.Net中,我知道如何锐化图像,这对于缩略图非常有效,所以我现在正在寻找一种方法来为Wordpress(显然是php)实现这一点。

    我真的很烂的php,所以任何帮助是非常感谢!

    3 回复  |  直到 14 年前
        1
  •  0
  •   sevcsik    14 年前

    我想这就是你的答案: http://vikjavev.no/computing/ump.php 但是,您需要更改wp中的thumbnailer creator脚本。

        2
  •  2
  •   j0k gauthamp    12 年前

    <?php
    
    /*
    
    **************************************************************************
    
    Plugin Name:  Regenerate Thumbnails
    Plugin URI:   http://www.viper007bond.com/wordpress-plugins/regenerate-thumbnails/
    Description:  Allows you to regenerate all thumbnails after changing the thumbnail sizes.
    Version:      2.2.3
    Author:       Viper007Bond
    Author URI:   http://www.viper007bond.com/
    
    **************************************************************************
    
    Copyright (C) 2008-2011 Viper007Bond
    
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
    **************************************************************************/
    
    class RegenerateThumbnails {
        var $menu_id;
    
        // Plugin initialization
        function RegenerateThumbnails() {
            // Load up the localization file if we're using WordPress in a different language
            // Place it in this plugin's "localization" folder and name it "regenerate-thumbnails-[value in wp-config].mo"
            load_plugin_textdomain( 'regenerate-thumbnails', false, '/regenerate-thumbnails/localization' );
    
            add_action( 'admin_menu',                              array( &$this, 'add_admin_menu' ) );
            add_action( 'admin_enqueue_scripts',                   array( &$this, 'admin_enqueues' ) );
            add_action( 'wp_ajax_regeneratethumbnail',             array( &$this, 'ajax_process_image' ) );
            add_filter( 'media_row_actions',                       array( &$this, 'add_media_row_action' ), 10, 2 );
            //add_filter( 'bulk_actions-upload',                     array( &$this, 'add_bulk_actions' ), 99 ); // A last minute change to 3.1 makes this no longer work
            add_action( 'admin_head-upload.php',                   array( &$this, 'add_bulk_actions_via_javascript' ) );
            add_action( 'admin_action_bulk_regenerate_thumbnails', array( &$this, 'bulk_action_handler' ) ); // Top drowndown
            add_action( 'admin_action_-1',                         array( &$this, 'bulk_action_handler' ) ); // Bottom dropdown (assumes top dropdown = default value)
    
            // Allow people to change what capability is required to use this plugin
            $this->capability = apply_filters( 'regenerate_thumbs_cap', 'manage_options' );
        }
    
    
        // Register the management page
        function add_admin_menu() {
            $this->menu_id = add_management_page( __( 'Regenerate Thumbnails', 'regenerate-thumbnails' ), __( 'Regen. Thumbnails', 'regenerate-thumbnails' ), $this->capability, 'regenerate-thumbnails', array(&$this, 'regenerate_interface') );
        }
    
    
        // Enqueue the needed Javascript and CSS
        function admin_enqueues( $hook_suffix ) {
            if ( $hook_suffix != $this->menu_id )
                return;
    
            // WordPress 3.1 vs older version compatibility
            if ( wp_script_is( 'jquery-ui-widget', 'registered' ) )
                wp_enqueue_script( 'jquery-ui-progressbar', plugins_url( 'jquery-ui/jquery.ui.progressbar.min.js', __FILE__ ), array( 'jquery-ui-core', 'jquery-ui-widget' ), '1.8.6' );
            else
                wp_enqueue_script( 'jquery-ui-progressbar', plugins_url( 'jquery-ui/jquery.ui.progressbar.min.1.7.2.js', __FILE__ ), array( 'jquery-ui-core' ), '1.7.2' );
    
            wp_enqueue_style( 'jquery-ui-regenthumbs', plugins_url( 'jquery-ui/redmond/jquery-ui-1.7.2.custom.css', __FILE__ ), array(), '1.7.2' );
        }
    
    
        // Add a "Regenerate Thumbnails" link to the media row actions
        function add_media_row_action( $actions, $post ) {
            if ( 'image/' != substr( $post->post_mime_type, 0, 6 ) || ! current_user_can( $this->capability ) )
                return $actions;
    
            $url = wp_nonce_url( admin_url( 'tools.php?page=regenerate-thumbnails&goback=1&ids=' . $post->ID ), 'regenerate-thumbnails' );
            $actions['regenerate_thumbnails'] = '<a href="' . esc_url( $url ) . '" title="' . esc_attr( __( "Regenerate the thumbnails for this single image", 'regenerate-thumbnails' ) ) . '">' . __( 'Regenerate Thumbnails', 'regenerate-thumbnails' ) . '</a>';
    
            return $actions;
        }
    
    
        // Add "Regenerate Thumbnails" to the Bulk Actions media dropdown
        function add_bulk_actions( $actions ) {
            $delete = false;
            if ( ! empty( $actions['delete'] ) ) {
                $delete = $actions['delete'];
                unset( $actions['delete'] );
            }
    
            $actions['bulk_regenerate_thumbnails'] = __( 'Regenerate Thumbnails', 'regenerate-thumbnails' );
    
            if ( $delete )
                $actions['delete'] = $delete;
    
            return $actions;
        }
    
    
        // Add new items to the Bulk Actions using Javascript
        // A last minute change to the "bulk_actions-xxxxx" filter in 3.1 made it not possible to add items using that
        function add_bulk_actions_via_javascript() {
            if ( ! current_user_can( $this->capability ) )
                return;
    ?>
            <script type="text/javascript">
                jQuery(document).ready(function($){
                    $('select[name^="action"] option:last-child').before('<option value="bulk_regenerate_thumbnails"><?php echo esc_attr( __( 'Regenerate Thumbnails', 'regenerate-thumbnails' ) ); ?></option>');
                });
            </script>
    <?php
        }
    
    
        // Handles the bulk actions POST
        function bulk_action_handler() {
            if ( empty( $_REQUEST['action'] ) || ( 'bulk_regenerate_thumbnails' != $_REQUEST['action'] && 'bulk_regenerate_thumbnails' != $_REQUEST['action2'] ) )
                return;
    
            if ( empty( $_REQUEST['media'] ) || ! is_array( $_REQUEST['media'] ) )
                return;
    
            check_admin_referer( 'bulk-media' );
    
            $ids = implode( ',', array_map( 'intval', $_REQUEST['media'] ) );
    
            // Can't use wp_nonce_url() as it escapes HTML entities
            wp_redirect( add_query_arg( '_wpnonce', wp_create_nonce( 'regenerate-thumbnails' ), admin_url( 'tools.php?page=regenerate-thumbnails&goback=1&ids=' . $ids ) ) );
            exit();
        }
    
    
        // The user interface plus thumbnail regenerator
        function regenerate_interface() {
            global $wpdb;
    
            ?>
    
    <div id="message" class="updated fade" style="display:none"></div>
    
    <div class="wrap regenthumbs">
        <h2><?php _e('Regenerate Thumbnails', 'regenerate-thumbnails'); ?></h2>
    
    <?php
    
            // If the button was clicked
            if ( ! empty( $_POST['regenerate-thumbnails'] ) || ! empty( $_REQUEST['ids'] ) ) {
                // Capability check
                if ( ! current_user_can( $this->capability ) )
                    wp_die( __( 'Cheatin&#8217; uh?' ) );
    
                // Form nonce check
                check_admin_referer( 'regenerate-thumbnails' );
    
                // Create the list of image IDs
                if ( ! empty( $_REQUEST['ids'] ) ) {
                    $images = array_map( 'intval', explode( ',', trim( $_REQUEST['ids'], ',' ) ) );
                    $ids = implode( ',', $images );
                } else {
                    // Directly querying the database is normally frowned upon, but all
                    // of the API functions will return the full post objects which will
                    // suck up lots of memory. This is best, just not as future proof.
                    if ( ! $images = $wpdb->get_results( "SELECT ID FROM $wpdb->posts WHERE post_type = 'attachment' AND post_mime_type LIKE 'image/%' ORDER BY ID DESC" ) ) {
                        echo '  <p>' . sprintf( __( "Unable to find any images. Are you sure <a href='%s'>some exist</a>?", 'regenerate-thumbnails' ), admin_url( 'upload.php?post_mime_type=image' ) ) . "</p></div>";
                        return;
                    }
    
                    // Generate the list of IDs
                    $ids = array();
                    foreach ( $images as $image )
                        $ids[] = $image->ID;
                    $ids = implode( ',', $ids );
                }
    
                echo '  <p>' . __( "Please be patient while the thumbnails are regenerated. This can take a while if your server is slow (inexpensive hosting) or if you have many images. Do not navigate away from this page until this script is done or the thumbnails will not be resized. You will be notified via this page when the regenerating is completed.", 'regenerate-thumbnails' ) . '</p>';
    
                $count = count( $images );
    
                $text_goback = ( ! empty( $_GET['goback'] ) ) ? sprintf( __( 'To go back to the previous page, <a href="%s">click here</a>.', 'regenerate-thumbnails' ), 'javascript:history.go(-1)' ) : '';
                $text_failures = sprintf( __( 'All done! %1$s image(s) were successfully resized in %2$s seconds and there were %3$s failure(s). To try regenerating the failed images again, <a href="%4$s">click here</a>. %5$s', 'regenerate-thumbnails' ), "' + rt_successes + '", "' + rt_totaltime + '", "' + rt_errors + '", esc_url( wp_nonce_url( admin_url( 'tools.php?page=regenerate-thumbnails&goback=1' ), 'regenerate-thumbnails' ) . '&ids=' ) . "' + rt_failedlist + '", $text_goback );
                $text_nofailures = sprintf( __( 'All done! %1$s image(s) were successfully resized in %2$s seconds and there were 0 failures. %3$s', 'regenerate-thumbnails' ), "' + rt_successes + '", "' + rt_totaltime + '", $text_goback );
    ?>
    
    
        <noscript><p><em><?php _e( 'You must enable Javascript in order to proceed!', 'regenerate-thumbnails' ) ?></em></p></noscript>
    
        <div id="regenthumbs-bar" style="position:relative;height:25px;">
            <div id="regenthumbs-bar-percent" style="position:absolute;left:50%;top:50%;width:300px;margin-left:-150px;height:25px;margin-top:-9px;font-weight:bold;text-align:center;"></div>
        </div>
    
        <p><input type="button" class="button hide-if-no-js" name="regenthumbs-stop" id="regenthumbs-stop" value="<?php _e( 'Abort Resizing Images', 'regenerate-thumbnails' ) ?>" /></p>
    
        <h3 class="title"><?php _e( 'Debugging Information', 'regenerate-thumbnails' ) ?></h3>
    
        <p>
            <?php printf( __( 'Total Images: %s', 'regenerate-thumbnails' ), $count ); ?><br />
            <?php printf( __( 'Images Resized: %s', 'regenerate-thumbnails' ), '<span id="regenthumbs-debug-successcount">0</span>' ); ?><br />
            <?php printf( __( 'Resize Failures: %s', 'regenerate-thumbnails' ), '<span id="regenthumbs-debug-failurecount">0</span>' ); ?>
        </p>
    
        <ol id="regenthumbs-debuglist">
            <li style="display:none"></li>
        </ol>
    
        <script type="text/javascript">
        // <![CDATA[
            jQuery(document).ready(function($){
                var i;
                var rt_images = [<?php echo $ids; ?>];
                var rt_total = rt_images.length;
                var rt_count = 1;
                var rt_percent = 0;
                var rt_successes = 0;
                var rt_errors = 0;
                var rt_failedlist = '';
                var rt_resulttext = '';
                var rt_timestart = new Date().getTime();
                var rt_timeend = 0;
                var rt_totaltime = 0;
                var rt_continue = true;
    
                // Create the progress bar
                $("#regenthumbs-bar").progressbar();
                $("#regenthumbs-bar-percent").html( "0%" );
    
                // Stop button
                $("#regenthumbs-stop").click(function() {
                    rt_continue = false;
                    $('#regenthumbs-stop').val("<?php echo $this->esc_quotes( __( 'Stopping...', 'regenerate-thumbnails' ) ); ?>");
                });
    
                // Clear out the empty list element that's there for HTML validation purposes
                $("#regenthumbs-debuglist li").remove();
    
                // Called after each resize. Updates debug information and the progress bar.
                function RegenThumbsUpdateStatus( id, success, response ) {
                    $("#regenthumbs-bar").progressbar( "value", ( rt_count / rt_total ) * 100 );
                    $("#regenthumbs-bar-percent").html( Math.round( ( rt_count / rt_total ) * 1000 ) / 10 + "%" );
                    rt_count = rt_count + 1;
    
                    if ( success ) {
                        rt_successes = rt_successes + 1;
                        $("#regenthumbs-debug-successcount").html(rt_successes);
                        $("#regenthumbs-debuglist").append("<li>" + response.success + "</li>");
                    }
                    else {
                        rt_errors = rt_errors + 1;
                        rt_failedlist = rt_failedlist + ',' + id;
                        $("#regenthumbs-debug-failurecount").html(rt_errors);
                        $("#regenthumbs-debuglist").append("<li>" + response.error + "</li>");
                    }
                }
    
                // Called when all images have been processed. Shows the results and cleans up.
                function RegenThumbsFinishUp() {
                    rt_timeend = new Date().getTime();
                    rt_totaltime = Math.round( ( rt_timeend - rt_timestart ) / 1000 );
    
                    $('#regenthumbs-stop').hide();
    
                    if ( rt_errors > 0 ) {
                        rt_resulttext = '<?php echo $text_failures; ?>';
                    } else {
                        rt_resulttext = '<?php echo $text_nofailures; ?>';
                    }
    
                    $("#message").html("<p><strong>" + rt_resulttext + "</strong></p>");
                    $("#message").show();
                }
    
                // Regenerate a specified image via AJAX
                function RegenThumbs( id ) {
                    $.ajax({
                        type: 'POST',
                        url: ajaxurl,
                        data: { action: "regeneratethumbnail", id: id },
                        success: function( response ) {
                            if ( response.success ) {
                                RegenThumbsUpdateStatus( id, true, response );
                            }
                            else {
                                RegenThumbsUpdateStatus( id, false, response );
                            }
    
                            if ( rt_images.length && rt_continue ) {
                                RegenThumbs( rt_images.shift() );
                            }
                            else {
                                RegenThumbsFinishUp();
                            }
                        },
                        error: function( response ) {
                            RegenThumbsUpdateStatus( id, false, response );
    
                            if ( rt_images.length && rt_continue ) {
                                RegenThumbs( rt_images.shift() );
                            } 
                            else {
                                RegenThumbsFinishUp();
                            }
                        }
                    });
                }
    
                RegenThumbs( rt_images.shift() );
            });
        // ]]>
        </script>
    <?php
            }
    
            // No button click? Display the form.
            else {
    ?>
        <form method="post" action="">
    <?php wp_nonce_field('regenerate-thumbnails') ?>
    
        <p><?php printf( __( "Use this tool to regenerate thumbnails for all images that you have uploaded to your blog. This is useful if you've changed any of the thumbnail dimensions on the <a href='%s'>media settings page</a>. Old thumbnails will be kept to avoid any broken images due to hard-coded URLs.", 'regenerate-thumbnails' ), admin_url( 'options-media.php' ) ); ?></p>
    
        <p><?php printf( __( "You can regenerate specific images (rather than all images) from the <a href='%s'>Media</a> page. Hover over an image's row and click the link to resize just that one image or use the checkboxes and the &quot;Bulk Actions&quot; dropdown to resize multiple images (WordPress 3.1+ only).", 'regenerate-thumbnails '), admin_url( 'upload.php' ) ); ?></p>
    
        <p><?php _e( "Thumbnail regeneration is not reversible, but you can just change your thumbnail dimensions back to the old values and click the button again if you don't like the results.", 'regenerate-thumbnails' ); ?></p>
    
        <p><?php _e( 'To begin, just press the button below.', 'regenerate-thumbnails '); ?></p>
    
        <p><input type="submit" class="button hide-if-no-js" name="regenerate-thumbnails" id="regenerate-thumbnails" value="<?php _e( 'Regenerate All Thumbnails', 'regenerate-thumbnails' ) ?>" /></p>
    
        <noscript><p><em><?php _e( 'You must enable Javascript in order to proceed!', 'regenerate-thumbnails' ) ?></em></p></noscript>
    
        </form>
    <?php
            } // End if button
    ?>
    </div>
    
    <?php
        }
    
    
        // Process a single image ID (this is an AJAX handler)
        function ajax_process_image() {
            @error_reporting( 0 ); // Don't break the JSON result
    
            header( 'Content-type: application/json' );
    
            $id = (int) $_REQUEST['id'];
            $image = get_post( $id );
    
            if ( ! $image || 'attachment' != $image->post_type || 'image/' != substr( $image->post_mime_type, 0, 6 ) )
                die( json_encode( array( 'error' => sprintf( __( 'Failed resize: %s is an invalid image ID.', 'regenerate-thumbnails' ), esc_html( $_REQUEST['id'] ) ) ) ) );
    
            if ( ! current_user_can( $this->capability ) )
                $this->die_json_error_msg( $image->ID, __( "Your user account doesn't have permission to resize images", 'regenerate-thumbnails' ) );
    
            $fullsizepath = get_attached_file( $image->ID );
    
            if ( false === $fullsizepath || ! file_exists( $fullsizepath ) )
                $this->die_json_error_msg( $image->ID, sprintf( __( 'The originally uploaded image file cannot be found at %s', 'regenerate-thumbnails' ), '<code>' . esc_html( $fullsizepath ) . '</code>' ) );
    
            @set_time_limit( 900 ); // 5 minutes per image should be PLENTY
    
            $metadata = wp_generate_attachment_metadata( $image->ID, $fullsizepath );
    
            if ( is_wp_error( $metadata ) )
                $this->die_json_error_msg( $image->ID, $metadata->get_error_message() );
            if ( empty( $metadata ) )
                $this->die_json_error_msg( $image->ID, __( 'Unknown failure reason.', 'regenerate-thumbnails' ) );
    
            // If this fails, then it just means that nothing was changed (old value == new value)
            wp_update_attachment_metadata( $image->ID, $metadata );
    
            die( json_encode( array( 'success' => sprintf( __( '&quot;%1$s&quot; (ID %2$s) was successfully resized in %3$s seconds.', 'regenerate-thumbnails' ), esc_html( get_the_title( $image->ID ) ), $image->ID, timer_stop() ) ) ) );
        }
    
    
        // Helper to make a JSON error message
        function die_json_error_msg( $id, $message ) {
            die( json_encode( array( 'error' => sprintf( __( '&quot;%1$s&quot; (ID %2$s) failed to resize. The error message was: %3$s', 'regenerate-thumbnails' ), esc_html( get_the_title( $id ) ), $id, $message ) ) ) );
        }
    
    
        // Helper function to escape quotes in strings for use in Javascript
        function esc_quotes( $string ) {
            return str_replace( '"', '\"', $string );
        }
    }
    
    // Start up this plugin
    add_action( 'init', 'RegenerateThumbnails' );
    function RegenerateThumbnails() {
        global $RegenerateThumbnails;
        $RegenerateThumbnails = new RegenerateThumbnails();
    }
    
    // sharpen uploaded images
    function ajx_sharpen_resized_files( $resized_file ) {
    
        $image = wp_load_image( $resized_file );
        if ( !is_resource( $image ) )
            return new WP_Error( 'error_loading_image', $image, $file );
    
        $size = @getimagesize( $resized_file );
        if ( !$size )
            return new WP_Error('invalid_image', __('Could not read image size'), $file);
        list($orig_w, $orig_h, $orig_type) = $size;
    
        switch ( $orig_type ) {
            case IMAGETYPE_JPEG:
                $matrix = array(
                    array(apply_filters('sharpen_resized_corner',-1.2), apply_filters('sharpen_resized_side',-1), apply_filters('sharpen_resized_corner',-1.2)),
                    array(apply_filters('sharpen_resized_side',-1), apply_filters('sharpen_resized_center',20), apply_filters('sharpen_resized_side',-1)),
                    array(apply_filters('sharpen_resized_corner',-1.2), apply_filters('sharpen_resized_side',-1), apply_filters('sharpen_resized_corner',-1.2)),
                );
    
                $divisor = array_sum(array_map('array_sum', $matrix));
                $offset = 0; 
                imageconvolution($image, $matrix, $divisor, $offset);
                imagejpeg($image, $resized_file,apply_filters( 'jpeg_quality', 100, 'edit_image' ));
                break;
            case IMAGETYPE_PNG:
                return $resized_file;
            case IMAGETYPE_GIF:
                return $resized_file;
        }
    
        // we don't need images in memory anymore
        imagedestroy( $image );
    
        return $resized_file;
    }   
    
    add_filter('image_make_intermediate_size', 'ajx_sharpen_resized_files', 900);
    
    ?>
    
        3
  •  0
  •   John Conde    11 年前

    如果您的wordpress帖子缩略图模糊,请转到主题CSS,获取代码:

    .secondary-posts .post-thumbnail
    width: 100%;
    background-color: #666;
    height: 150px;
    padding: 0;
    box-shadow: 0 0px 5px #888;
    background-repeat: no-repeat;
    background-position:center;
    background-size: 150px auto;
    

    (将此背景大小更改为缩略图框大小(例如150px)

    http://kresnatourjogja.com/category/jogjakarta-temple/