Fix It in Post Changing Color Space Working with different formats may entail changing the working color space. This is best done as early as possible in the process, provided the new color space is going to be the primary one, as if it is done later on, it may lead to artifacts. Most systems allow you to change color space transparently, requiring little effort on your part. There are two considerations, though. First, you may need to legalize colors (using the technique given above) to ensure that the converted colors can be reproduced correctly within the new gamut. The second, and much trickier, part of the problem is that your target color space may vastly differ from that of your primary display device. For example, many film productions that undergo a digital intermediate proc- ess use a film color space, which cannot be faithfully emulated using standard digital display devices. These types of production require specially calibrated monitoring equipment, in conjunction with sophisticated color lookup tables (CLUTs), to ensure that the colors seen on the display match those that will ultimately be pro- jected from the outputted film prints.