OrbConvert converts your image files online. Amongst many others, we support PNG, JPG, JPEG, WEBP, GIF, SVG and TIFF. You can use the options to control image resolution, quality and file size.
From
Portable GrayMap
The Netpbm grey-scale format — one channel, uncompressed. Colour information is discarded, not converted.
All PGM conversionsTo
Silicon Graphics Image
The native image format of Silicon Graphics workstations, still used in visual-effects pipelines. It carries transparency and holds 8 or 16 bits per channel.
All SGI conversions