Apple Shake 4 - Manual (Page 445)

Chapter 15 Image Processing Basics 445
The following images are from a log plate. The left image is the original plate. The right
image is the output plate, also in log color, that has been passed through the log-to-
lin-to-log conversion process.
Notice that the highlights in the hair detail are lost.
The following images are graphs that represent the log plates in the above illustrations.
The left graph represents the entire range of the log image. Keep in mind that this
represents all of the potential values—few log plates have this entire range. The right
image displays the result of the log-to-lin-to-log conversion process.
So, why is this happening? In the first part of this chapter (“The Logarithmic Cineon
File” section), using an 11-stop example image, 7 stops were extracted and the rest
thrown away in order to view and work on the image in the computer. These same 7
stops can be thought of as the stops between 95 and 685. As mentioned earlier, the
rest are thrown away, or clipped.
Original log image Output log image
Graph of original ramp Graph of output ramp