Index Color is a process where a design with lots of colors is reduced down to a limited color palette. This process converts the design to a square dot pixel pattern. We pick colors from within the design for to use for a master color palette. We then take these colors and recreate the image using the colors you picked. All secondary colors are made mixing the colors from the palette. Generally index color needs at least six to eight colors in the color palette for the image to look correct. If too few colors are used there is a tendency to have a muddy look. Photo-realistic designs need lots of colors. Some of the best shirt images use eight to nine colors. Since the image is converted to “pixels” the resolution of the scan is the resolution of the garment image. The artwork resolution should be the same resolution what you want the final image size. This is one of the reasons why we ask for high resolution artwork.