You could have downloaded Tri-X Enhanced 1.0 for Mac from our application library for free. The program belongs to Design & Photo Tools.
From the developer:
Tri-X Enhanced is a set of SilverOxide filters for black and white films in Adobe Photoshop.
You may want to check out more software for Mac, such as PDF Enhancer, Enhancer or Safari Enhancer, which might be similar to Tri-X Enhanced.
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Editors & Converters