GPS Wed July 3, 2002: GWImage is a fast JPEG display widget for systems with Tk and X. It's much faster than Img, but of course this comes at the cost of reduced portability.
I've done my best to keep the code simple. It could also serve as an example C widget.
I recently added scrolling capability and I plan to add PNG support eventually.
GWImage is released under the terms of a BSD-like license.
http://www.xmission.com/~georgeps/gwimage/
The more I hear about how people use it the more I feel like improving it.