How could resize the header of Twenty Ten theme?
Theme default of WordPress have been changed. The new theme is Twenty Ten. This theme is very stylist. The header images of exactly 940 × 198 pixels will be used as-is. You can change the header image in any time. Thats available header option to do that. If you think the header theme is too height in size, you can modify and resize them via function.php.
Just change the size 198 in this function.php code:
define( 'HEADER_IMAGE_HEIGHT', apply_filters( 'twentyten_header_image_height', 198 ) );
After you change the height size, you must have an image header in the same size and upload it via header option (on your dashboard). Just the simple huh