Setting default image size

Question

I'm using WpeMatico plugin which saves images in the post using:

$attach_id = wp_insert_attachment( $attachment, $filename, $postid );

I looked inside wp-includes/post.php > wp_insert_attachment function, but couldn't quite figure how to resize images. I want ALL/ANY images to have a max size of 1024 resize proportionately. I also have the resizing function, just not sure how to use it.

Thanks!

Answer 1

The original image size (i.e. 'full') is never modified. Intermediate image sizes are controlled in various places:

1. Default image sizes ( 'thumbnail', 'medium', 'large' ): core settings, via Dashboard -> Settings -> Media
2. Custom image sizes: Theme functions.php file, via add_image_size()
3. Post Thumbnail size ( 'thumbnail' ): Theme functions.php file, viaset_post_thumbnail_size()`

By default, the 'large' image size is constrained to 1024px. So, you can simply output this image size where you need a 1024px image.

If you need to create a custom image size, you'll just need to regenerate thumbnails for existing images.

Edit

If you need/want to constrain the size of the 'full' image size, then you'll need to modify it during the upload process, i.e. by hooking into wp_handle_upload, and performing the resize.

There are various Plugins that accomplish this. A quick search turns up:

• Resize At Upload
• Resize At Upload Plus
• Resize Images Before Upload
• And many more...