You will want to use add_image_size() in your functions.php to tell WordPress you’d like it to create a new image size when you upload images:
1 | add_image_size( 'custom_image_size_name', 290, 180, true ); |
Using the value true will tell WordPress you want it to crop the image to those exact dimensions.
Once you do that and upload an image, you can use custom_image_size_name in wp_get_attachment_image() to get the correct image.
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