In this lesson we take a closer look at the techniques used to adjust the blend between Luminance and Color data via LRGBCombination. This step of creating a color image is not typically given much thought and fraught with undesirable results. A generalized model followed by a few examples is shown in this recording.
See below the video for some additional information.
Here is the Pixel Math Expression to generate the color bars:
If desired, you can download my image that compares the variations of RGB image processing.
The expression to create a horizonal gradient is simply X(). This is a function that outputs the horizontal position as normalized value between 0 and 1. So if the x position is 25% across the image (from the left) then the x value is 0.25. Since I am writing this number to the view- it becomes the brightness value. So I will have a range of values from 0 (left side) to 1 (right side)- thus making a horizonal gradient.