I am new to website design and am having a tough time uploading my custom header.
I am using the Twenty Eleven theme on my blog which supports custom headers. But the header will not load properly and I keep getting this error message on every theme I try:
Warning: imagecreatefromstring() [function.imagecreatefromstring]: Data is not in a recognized format in /hermes/bosweb/web173/b1736/ipg.toyhypeusacom/wp-includes/media.php on line 258
Image could not be processed. Please go back and try again.
Also the pixel size states it has to be 1000 × 288 pixels. What size should I make my banner?