Convert psd to bw Online: psd2bw
You can use Tom's Editor to easily convert images from
.PSD to Silicon Graphics RGB .BW.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
PSD is in internal image format of Adobe Photoshop. It can store all the features offered by Photoshop, like layers and paths. Images can be compressed or not.
Silicon Graphics RGB is an image format with extension BW.