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Sharpen small images sizes generated by WP
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// Zu diesem Code gibt es einen Artikel im Blog die-netzialisten.de | |
// https://die-netzialisten.de/wordpress/unscharfe-beitragsbilder-nachschaerfen/ | |
function ks_sharpen_resized_files( $resized_file ) { | |
$image = imagecreatefromstring( file_get_contents( $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', 'ks_sharpen_resized_files',900); |
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