Returns filter string for usage with open and save picture dialogs which contains all registered image file formats.
function GetImageFileFormatsFilter(OpenFileFilter: Boolean): string;
Imaging (at line 516)
Set OpenFileFilter to True if you want filter for open dialog and to False if you want save dialog filter (formats that cannot save to files are not added then). For open dialog filter for all known graphic files (like All(*.jpg;*.png;....) is added too at the first index.