Topaz DeJPEG is a Photoshop compatible plug-in that can remove blocks and fringes caused by JPEG compression. The default settings were not very effective, but some adjustments of the sliders produced good results and noticeable decrease in artifacts. You can combine smoothing with sharpness and edge crispness to adjust results. In our tests, Topaz DeJPEG achieves results similar to the Photoshop Despeckle filter and USM. JPEG compression artifacts substantially affect the quality of any digital image. They can be seen as mosquito noise, blockiness or checkerboarding, and edge artifacts. Topaz DeJPEG is a plug-in thats specifically designed to address this problem and is much more effective than the native Photoshop JPEG artifact remover. Almost every Internet image can benefit from a reduction in JPEG compression artifact noise.
No Photoshop No problem. Topaz DeJPEG works with most software that support Photoshop plugins, including Irfanview (GIMP not supported).
In addition, Topaz DeJPEG supports:
* both 8-bit and 16-bit/channel
* Photoshop scripting and actions
* batch processing of multiple images.
* context sensitive help
Topaz DeJPEG is currently only available on Windows PC.

The license of this software is Freeware, you can free download and free use this image utility software.