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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 154 | * @param int $quality Compression Quality. Range: [1,100] |
| 155 | * @return boolean|WP_Error |
| 156 | */ |
| 157 | public function set_quality( $quality = null ) { |
| 158 | if ( !$quality ) |
| 159 | $quality = $this->quality; |
| 160 | |
| 161 | try { |
| 162 | if( 'image/jpeg' == $this->mime_type ) { |
| 163 | $this->image->setImageCompressionQuality( apply_filters( 'jpeg_quality', $quality, 'image_resize' ) ); |
| 164 | $this->image->setImageCompression( imagick::COMPRESSION_JPEG ); |
| 165 | } |
| 166 | else { |
| 167 | $this->image->setImageCompressionQuality( $quality ); |
| 168 | } |
| 169 | } |
| 170 | catch ( Exception $e ) { |
| 171 | return new WP_Error( 'image_quality_error', $e->getMessage() ); |
| 172 | } |