Nonlinear revision control for images

Hsiang Ting Chen*, Li Yi Wei, Chun Fa Chang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

39 Citations (Scopus)


Revision control is a vital component of digital project management and has been widely deployed for text files. Binary files, on the other hand, have received relatively less attention. This can be inconvenient for graphics applications that use a significant amount of binary data, such as images, videos, meshes, and animations. Existing strategies such as storing whole files for individual revisions or simple binary deltas could consume significant storage and obscure vital semantic information. We present a nonlinear revision control system for images, designed with the common digital editing and sketching workflows in mind. We use DAG (directed acyclic graph) as the core structure, with DAG nodes representing editing operations and DAG edges the corresponding spatial, temporal and semantic relationships. We visualize our DAG in RevG (revision graph), which provides not only as a meaningful display of the revision history but also an intuitive interface for common revision control operations such as review, replay, diff, addition, branching, merging, and conflict resolving. Beyond revision control, our system also facilitates artistic creation processes in common image editing and digital painting workflows. We have built a rototype system upon GIMP, an open source image editor, and demonstrate its effectiveness through formative user study and comparisons with alternative revision control systems.

Original languageEnglish
Title of host publicationProceedings of ACM SIGGRAPH 2011, SIGGRAPH 2011
Publication statusPublished - 2011 Jul
EventACM SIGGRAPH 2011, SIGGRAPH 2011 - Vancouver, BC, Canada
Duration: 2011 Aug 72011 Aug 11


CityVancouver, BC


  • Images
  • Interaction
  • Nonlinear editing
  • Revision control

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design


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