Description courtesy of ACM Library:

ACM Transactions on Graphics (TOG) is the foremost peer-reviewed journal in the graphics field. In the colorful pages of TOG, leading researchers discuss breakthroughs in computer-aided design, synthetic image generation, rendering, solid modeling, and other areas. “Research,” the largest regular section, is necessary intellectual nourishment for anyone implementing graphics systems.

TOG has a strong synergy with ACM SIGGRAPH, the premier conference organization in graphics. Of the six issues published by TOG each year, two are special issues containing the papers presented at the annual SIGGRAPH and SIGGRAPH Asia conferences. Conversely, authors of papers published in the regular issues of TOG can present their work at either of these two conferences. Also, several paths provide reviewer continuity between the conference and the journal.