Apple Shake 4 - Manual (Page 678)

678 Chapter 23 Color Correction
Example 2
A 256 x 256 8-bit Color. Since the color is set to (approximately) .75, .5, .25, each channel
exists at only one position in the Histogram.
Example 3
A 256 x 256 8-bit 4-corner Grad. The four corner values are of red (1, .5, .5, .5), of green
(0, 1, .5, .5), and of blue (.5, 0, 0, 0). This reflects that most of red’s values are around .5,
ramping downward to 1, and no value is less than .5. In the Viewer, press R, G, B, or C to
toggle through the different channels.
Example 4
Next, a Brightness of 2 is added between the Grad and the Histogram. The
maxPerChannel parameter is enabled in the Histogram to better see the results. The
result (the image is zoomed in here) is no odd values (all numbers are multiplied by 2),
so there is a gap at every other value. It is a telltale sign of digital alteration when such
regular patterns appear in a histogram.