How to skip the creation of landscape thumbnails for an original portrait image

Question

Let's have some thumbnail sizes like that:

    add_image_size('home-slide-medium', 1000, 504, true); 
    add_image_size('home-slide-sm', 500, 252, true);
    add_image_size('video-poster', 780, 512); 

And let's upload a portrait image with size like 1000x3000px

How can avoid the creation of the landscape thumbnails (like 1000x504 or 500x252) for this portrait image?

I tried something like this but it doesn't work:

    add_filter( 'image_resize_dimensions', 'custom_image_resize_dimensions', 10, 6 );
      function custom_image_resize_dimensions( $payload, $orig_w, $orig_h, $dest_w, $dest_h, $crop ){



   // ie parameters: null, 1000, 3000, 1000, 500, true
   // ie payload: array(0, 0, 0, 1248, 1000, 504, 1000, 504))

    // if $crop is true...
    if($crop ) {

     // ...and if src img is portrait, skip it unless is same aspect ratio
    if($dest_w > $dest_h) {
        return false;
    }
    // else continue
    else {
        return $payload;
    }
}

else {
    return $payload;
}



}

Answer 1

You were headed in the right direction. There is another filter out there that handles intermediate_image_sizes_advanced. You can add or remove custom sized thumbnails in there. Rather than NOT creating your landscape custom sizes on a Portrait upload, maybe try to only create the landscape custom sizes on a landscape upload.

add_filter( 'intermediate_image_sizes_advanced', function( $sizes, $metadata ) {
  // Let's make sure we have the meta data we need before proceeding
  if(!empty($metadata['width']) && !empty($metadata['height'])){
    // Now let's make sure we have a Landscape being uploaded
    if($metadata['width'] > $metadata['height']){
      $sizes['home-slide-medium'] = array(
        'width' => 1000,
        'height' => 504,
        'crop' => true
      ); 
      $sizes['home-slide-sm'] = array(
        'width' => 500,
        'height' => 252,
        'crop' => tru
      e);
      $sizes['video-poster'] = array(
        'width' => 780,
        'height' => 512,
        'crop' =>false
      ); 
    }
  }

  return $sizes;
}, 10, 2);

I tested it a few times on my end, but let me know whatcha think!!