This free online image allows you to convert images to sgi online. High quality, very fast.
SGI
.SGI IRIS Graphic File
What is the sgi format? The SGI file type is primarily associated with Silicon Graphics by Silicon Graphics, Inc. This extension can be captured by a number of different programs to include: ACDSee (ACDSEE6.EXE), FotoCanvas (FOTOCANVAS2.EXE), Graphics Converter Pro (GRAPHICSCONVERTER.EXE), Image Editor Plus (ICPLUS.EXE), IrfanView, Paint Shop Pro (PSP.EXE or PAINT SHOP PRO.EXE), Picture Viewer (PICTUREVIEWER.EXE), Slow View (SLOWVIEW.EXE).