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Copy edited (e.g. ref. <https://en.wikipedia.org/wiki/JPEG>).
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Peter Mortensen
Peter Mortensen
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Sharpen Resized Images (only jpgJPEG)

This function sharpeningsharpens resized jpgJPEG images. An example of a difference:   

http://dl.dropbox.com/u/1652601/forrst/gdsharpen.png

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);

Sharpen Resized Images (only jpg)

This function sharpening resized jpg images. An example of difference:  http://dl.dropbox.com/u/1652601/forrst/gdsharpen.png

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);

Sharpen Resized Images (only JPEG)

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

http://dl.dropbox.com/u/1652601/forrst/gdsharpen.png

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);
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Ünsal Korkmaz
Ünsal Korkmaz
  • 1.3k
  • 2
  • 24
  • 45

Sharpen Resized Images (only jpg)

This function sharpening resized jpg images. An example of difference: http://dl.dropbox.com/u/1652601/forrst/gdsharpen.png

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);
Post Made Community Wiki by Ünsal Korkmaz