WordPress Sharpen Image after Crop

_shart_after_crop.md

Sharpen image after crop

This function sharpen images after WordPress crop, it's cool for images with small sizes width and height, make more visible and less blur, so more quality 😬, but test first, because on some type of images make a low quality image

Usage

Insert the function on your functions.php

foxtemas_sharpen_image.php

<?php 
/** 
 * Aplica sharpen nas imagens que serão recortadas
 * @version 1.0
 */
function foxtemas_sharpen_image( $resized_file ) {
	
	$image = imagecreatefromstring( file_get_contents( $resized_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', 90, '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', 'foxtemas_sharpen_image',900);