I’m trying to change the image's color (bottled water package) to a gray-scale gradient from white to black in conjunction with the motion of the slide. Specifically, I would like to change the color of the label to darker as a respondent moves the slider to the right and the color to black when a respondent locates the slider at the end of the scale.

You should create multiple images with different color and can replace the image based on scale rating option using JS.

Great. Many thanks for your suggestion.

Change Color of Image together with Slider Bar

Change Color of Image together with Slider Bar | Experience Community