The Targa (TGA) format supports images of
any dimensions with between 1 and 32 bits of color. It is
designed for Truevision hardware, but it is also used in other applications.
Choose File > Save As, and choose
Targa from the Format menu.
Specify a filename and location, and click Save.
In the Targa Options dialog box, select a resolution,
select the Compress (RLE) option if you want to compress the file,
and then click OK.