Theme Configuration: Header file max size

The maximum file size for a header image set in Theme Configuration appears to be 300kb.

Where is this set? upload_max_filesize us set to 2M in my php.ini.

I found this question while I was encountering the same limit. I found it in application/forms/ThemeConfiguration.php, declared as MAX_UPLOAD_SIZE. I just set mine to 2000kB.

Hope that helps!