LiveQuartz is a powerful free image editor. It is based on layers and CoreImage filters.
You have the layers on the left and the filters on the right of the window. (An alternate user interface with settings in a drawer is also available via preferences)
To edit an image, just drag it into the window (or layers' list at the desired position) and it will be added as a new layer....
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downloading guide 
Support for LiveQuartz Image Editor is available from the
publisher/developer site 
This download (LiveQuartz Image Editor) is freeware. "Freeware is copyrighted computer software which is made available for use free of charge, for an unlimited time, as opposed to shareware where the user is required to pay (e.g. after some trial period or for additional functionality)." More info at
Wikipedia.
Soft32 (ITNT) cannot be held liable for issues that arise from the download or use of these software products. We encourage you to determine whether this software or your intended use is legal. Even if we try to check the program files for viruses, we cannot guarantee 100% that they are clean. For your own protection always check downloaded files for viruses, spyware and malware.