Sigma also announced Sigma Photo Pro 5.5 software for Windows and Mac, which introduces a new monochrome mode for better transitioning your images to black and white. The program is specifically designed for editing the raw files from Sigma's own cameras, notably having support for SD1, SD1 Merrill, DP1 Merrill, DP2 Merrill and DP3 Merrill. If you shoot with one of those cameras, the monochrome conversion can be automatically tied the color mode you shoot in. More hands-on image tweakers will appreciates the individual color channel mixing palette for fine control of how the photo is converted to black and white, as well as grain controls. Sigma Photo Pro is a free download for Sigma shooters.