Registers a new image size. This means WordPress will create a copy of the image with the specified dimensions when a new image is uploaded.
<?php add_image_size( $name, $width, $height, $crop ); ?>
if ( function_exists( 'add_theme_support' ) ) {
add_theme_support( 'post-thumbnails');
set_post_thumbnail_size( 200, 200, true );
}
What does above code really mean?
Does it mean all my thumbnails will be 800x600 or smaller? Because even after setting set_post_thumbnail_size
get_post_thumbnail_id($post->ID) points to full-sized thumbnails (like 2500x1200). I don't really need that big images...
When do WordPress create (custom) thumbnails?
Set the image size by cropping the image (not showing part of it):
Set the image size by resizing the image proportionally (without distorting it):
add_image_size( 'custom-size', 220, 220, array( 'left', 'top' ) ); // Hard crop left top
When setting a crop position, the first value in the array is the x axis crop position, the second is the y axis crop position.
- x_crop_position accepts 'left' 'center', or 'right'.
- y_crop_position accepts 'top', 'center', or 'bottom'.
By default, these values default to 'center' when using hard crop mode.
if ( function_exists( 'add_theme_support' ) ) {
add_theme_support( 'post-thumbnails');
set_post_thumbnail_size( 900, 600, true );
add_image_size( 'foo', 400, 300, true );
add_image_size( 'bar', 200, 250, true );
}
When are these custom thumbnails created (like image-900x600.jpg /
image-400x300.jpg etc.) ? Only during upload process? What if I'm just
changing themes to theme based on add_image_size functions with
different thumbnail sizes, do I have to reupload all my images to get
right sizes? If yes, then using timthumb over add_image_size wasn't that
bad idea..
Posts
