Author & Contact : Andrew Zhilin <andrew_zhilin@yahoo.com>
The FreeImagePlugin brings FreeImage functionality to the QT4. For this plugin was planned mainly for extending p4merge, it is limited with reading-only capabilities.
With this plugin and p4merge you can diff almost any image format supported by FreeImage, including among others PSD, TGA, JP2 and DDS.
Building plugin can be rather tricky: you should use the same libraries, the same version of compiler, and most importantly exactly the same 'buildkey' as the host application.
Plugin prebuilt for p4merge for win32 will be attached
Just copy qfreeimage4.dll (or .so) to the plugins/imageformats. All should just work.
FreeImage QT4 Plugin released under the MIT License.