This book constitutes the refereed proceedings of the 12th Chinese Conference on Image and Graphics Technologies and Applications, IGTA 2017, held in Beijing, China June 30 - July 1, 2017. The 26 papers presented were carefully reviewed and selected from 78 submissions. They provide a forum for sharing progress in the areas of image processing technology; image analysis and understanding; computer vision and pattern recognition; big data mining, computer graphics, and VR; as well as image technology applications.