Um, it's actually even simpler than this. It's line breeding . . . just selectin brighter and brighter individuals, to keep them reproducing. Some individuals will look even brighter when they are adults, some will look much worse as adults. It's not a controlable factor.
The other thing that plays a VERY important role in GTP breeding outcomes is the locale - just like with reticulated pythons where knowing the locale of an animal is quite important to understanding its size range, and other factors, understanding GTP locale information will give you an idea of what the offspring will look like as an adult. Few people try for pure lines of GTP, most or two - three locale crossings to try and enhance the yellows or blues, Biak x Aru is a REALLY common one in this example.
Keep in mind, a polygenic trait is something like the Tiger gene in morelia, it IS heritable to a point, it will either be a weak influence, no influence, or strong influence, but with line breeding, if you cross an ugly parent to a nice parent you are likely to not produce any ones that resemble the nice parent, but more than likely a mix.
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