Color plane registration calculates the physical (spatial) difference in color plane location between the three color planes: red, green and blue. When color planes are not registered properly, color shifts occur at the boundaries of objects as shown below.
Registration is measured at the four (4) edges of the slanted edge SFR feature. The edges in the SFR feature all have light gray to dark neutral transitions which result in visible (and measurable) color shifts in the image. The horizontal and vertical positions of these color plane transitions are used to calculate the registration metrics for the image. Registration is the difference in pixels between each combination of colors (red to green, red to blue and green to blue).
The unacceptable image below had the blue channel mis-registered by two pixels. This is visible as blue along the left edge of the slanted-edge feature an yellow along the right side of the feature.
As shown in the chart on the right, the blue channel is mis-registered against both the green and red channels.
The aim for registration is set to zero. The limit entered for maximum mis-registration is used for all color combinations and has both positive and negative polarity.