Using Apply Image In Photoshop To Adjust The Underbase White

A basic tutorial on how to use the Apply Image function of Adobe Photoshop to adjust an underbase white channel. Its great for those newer to Photoshop along with users who have little to no experience with the Apply Image function.  Apply Image is a powerful tool offering many variables and is vital within the t-shirt color separation process.

This method is also used to merge any channel, in whole or a percentage of to another channel.
Just substitute a different channel for the white underbase and apply the desired channel to it to merge both.