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Tips (Total 2)

1. How to Resize Sharpen Images (only JPEG)
2. How to Extract Auto the First Image from the Post Content

# Tips-1) How to Resize Sharpen Images (only JPEG)

This function sharpens resized JPEG images. An example of a difference:

Sharpen Resized Images (only JPEG)

Just copy and past following codes to yourdomain.com/wp-content/themes/activated-theme/fucntions.php in the most below.
Example: PHP 
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(-1, -1, -1),
                array(-1, 16, -1),
                array(-1, -1, -1),
            );

            $divisor = array_sum(array_map('array_sum', $matrix));
            $offset = 0;
            imageconvolution($image, $matrix, $divisor, $offset);
            imagejpeg($image, $resized_file,apply_filters( 'jpeg_quality', 90, 'edit_image' ));
            break;

        case IMAGETYPE_PNG:
            return $resized_file;

        case IMAGETYPE_GIF:
            return $resized_file;
    }

    return $resized_file;
}

add_filter('image_make_intermediate_size', 'ajx_sharpen_resized_files', 900);

# Tips-2) How to Extract Auto the First Image from the Post Content

This code will automatically extract the first image associated with a post and allow you to display/use it by calling the getImage function.

Methods-1: Auto Extract the First Image from the Post Content

Just copy and paste following codes to yourdomain.com/wp-content/themes/activated-theme/fucntions.php in the most below.

Example: PHP 
// AUTOMATICALLY EXTRACT THE FIRST IMAGE FROM THE POST
function getImage($num) {
    global $more;
    $more = 1;
    $link = get_permalink();
    $content = get_the_content();
    $count = substr_count($content, '<img');
    $start = 0;

    for($i=1;$i<=$count;$i++) {
        $imgBeg = strpos($content, '<img', $start);
        $post = substr($content, $imgBeg);
        $imgEnd = strpos($post, '>');
        $postOutput = substr($post, 0, $imgEnd+1);
        $postOutput = preg_replace('/width="([0-9]*)" height="([0-9]*)"/', '',$postOutput);;
        $image[$i] = $postOutput;
        $start=$imgEnd+1;
    }

    if(stristr($image[$num],'<img')) {
        echo '<a href="'.$link.'">'.$image[$num]."</a>";
    }
    $more = 0;
}


 

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