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Original author(s) Larry Gritz and other contributors
Stable release
1.2 / July 8, 2013; 3 years ago (2013-07-08)
Development status Active
Written in C++
Operating system Multiplatform
Platform Multiplatform
Type graphics software
License BSD (modified)
Website Official page

OpenImageIO is an open source library for reading and writing images. Support for different image formats is realised through plugins. The project is distributed with a modified BSD license.


Project OpenImageIO started as ImageIO - an API that was part of Gelato, the renderer software developed by nVidia. Work on ImageIO started in 2002. In the same year the specification of the API and its header files was released under BSD license. In 2007, when the project Gelato was stopped, the development of ImageIO also ceased. After this Larry Gritz started a new project - OpenImageIO.

In April 2009 OpenImageIO was accepted into the Google Summer of Code program with four student slots.

September 2009 marked the release of Cloudy with a Chance of Meatballs (film), the first full-length feature film in whose production OpenImageIO, alongside OpenShadingLanguage, has been used as the texturing engine.[1]


OpenImageIO library comes with a few applications that demonstrate its features:

  • iconvert - converts image files from one format to another
  • idiff - compare two images, print information on how much they differ
  • iinfo - prints basic (width and height of the image and its color depth) or detailed (metadata) information about the given image
  • igrep - searches images for matching metadata
  • iv - a simple image viewer
  • maketx - a mipmap generation tool

Supported formats[edit]

As of today[when?] the library supports the following formats: OpenEXR, HDR/RGBE, TIFF, JPEG/JFIF, PNG, Truevision TGA, BMP, ICO, FITS.

See also[edit]

External links[edit]


  1. ^ Larry Gritz (2009-09-18). "Oiio-dev mailing list: 'Cloudy with a Chance of Meatballs...'". Retrieved 2009-09-18.