What is an IGI file?
An .IGI file is primarily known as an Indigo Image File. These files are created by Indigo Renderer, a high-performance 3D rendering application developed by Glare Technologies. An .IGI file stores raw, high dynamic range (HDR) image data from a render in progress or a completed render. This format allows 3D artists to pause and resume rendering tasks or adjust light layers long after the rendering process finishes.
How to open IGI files?
You can open an .IGI file directly using Indigo Renderer. Because it is a specialized rendering format, standard image viewers like Windows Photos or macOS Preview cannot open these files. Users often convert .IGI files to common formats like .EXR, .PNG, or .JPG inside the rendering software to easily share them with clients.
Best practices and troubleshooting
If you receive an .IGI file and do not have 3D rendering software installed, you will likely struggle to see the image. Since the format is proprietary to Glare Technologies, software compatibility is highly limited. Always ask the original creator to export a standard image format if you only need to view the final visual result.
Software and tools
Indigo Renderer is the official software to create and open an Indigo Image File. If you are unsure whether your file belongs to this software, you can use viewer.online/igi. Our platform can analyze .IGI files to identify the exact format and creator software, inspect the file structure, extract readable text, and check whether an online preview is available.
Summary
viewer.online/igi is useful for identifying, inspecting, and understanding .IGI files without installing software or dealing with compatibility problems. Since file extensions can sometimes be shared by different programs, our tool helps you confidently determine the actual format of your file.