Q: What is "Single Color" Option?
A: Single color means, the product color is plain color do not contain texture, models, gradients or multiple colors on the same side. Here you add single (Grayscale/White) product image per side and add rest product colors as HEX color code and the system will show the product colors based on this color code over given model image. For Ex: you have a product contains 2 print locations/sides with 20 available colors and the product color is plain color (no texture or multiple colors on product image). In this case, you will add the product image as (Grayscale/White) for the 2 print location/size (FRONT, BACK) and add only the color code under a color set. And you can use this color set while adding the product. With this method, you do not need to add much (in this case 20 product x 2 side = 40 images) images as product color image.

You can manage different product color sets (which you will need while adding products in admin). Here you can create a color set and add colors under these sets as you need. This will reduce your work while adding new customized products, there you do not need to add all the colors separately for every product while adding a customized product. You just create a color set and add colors on the set. And select the related color set while adding the product for customization.