In the customize page for the current theme the Current Header's Choose Image dialog shows - a "select and crop" option
But the custom WP_Customize_Image_Control shows only "Choose Image".
Is there a way to define image size/dimension for the images uploaded using WP_Customize_Image_Control, may be by using add_image_size . And will this trigger the WP_Customize_Image_Control uploader to show a "Select and Crop" option ?
ps: There is a request for such a feature as per this ticket.