Sigma has just introduced Version 5.5 of Sigma Photo Pro software. The update incorporates a new monochrome mode processing interface that features several new functions, including a channel-mixing palette, which allows users to control the level of red, green and blue within an image for better tonal separation and contrast. A new grain palette feature allows users to add or reduce the size and strength of grain within an image, producing a texture and dimension similar to that found in film photography. To download the latest Sigma PhotoPro software, visit the website below.