Compositor: A Free, Open-Source Mac Image Editor Designed as a Photoshop Alternative

According to its developer, Compositor is a free and open-source image editor built for macOS, designed to provide a workflow focused on compositing and post-processing similar to Adobe Photoshop. The project is available on GitHub and the official website, with source code that can be built using Xcode.

Key Features and Tools

• Layers and Adjustments: Supports folders with opacity, full Photoshop blend modes, layer masks, and a wide array of adjustment layers like Curves, Levels, and Hue/Saturation.
• Selection and Transformation: Features marquee tools, lassos, magic wand, object tracing, non-destructive transformations, and content-aware fill capabilities.
• Filters and Effects: Includes Gaussian blur, motion blur, lens effects, camera raw filtering, and AI-assisted features like Volumetric Light, which downloads a distilled depth model upon first use.
• Compatibility: Imports formats including JPEG, PNG, HEIC, TIFF, WebP, SVG, PDF, and PSD/PSB files (with some conversion limitations for vectors and text).

System Requirements and Availability

• Platform: Requires macOS and a Mac with Apple silicon.
• Source Code: Available as an Xcode project for users who wish to build or modify features.
• Language Support: English only at launch, with the developer noting that localization pull requests are not currently accepted.
• Unofficial Ports: Community members have created unofficial ports for Windows and Linux, though these are maintained separately from the official project.

Practical Implications and Verification

Users interested in evaluating Compositor can review the official repository on GitHub or download releases directly. Because it is an open-source tool, individuals can inspect the code and customize it via Xcode. Unofficial Windows and Linux ports must be verified through their respective community maintainers.