[Award Winner] Making Not so Random Coastlines in GIMP - alternative method

[RobA]

I just posted this tutorial on making coastlines based on pre-defined shapes.

Two things I don't like are the slight blurriness in the coastline, and the inability to play with the effective water-level (like you can do with the threshold method).

SO to this end, I came up with a variation on the threshold level as an alternative to my other not-so random coastline tutorial, this time with clever use of multiplying levels, rather than differencing levels.

Here is the "Not So Random Coastline Tutorial - alternative method"

NOTE: There is a description by Juggernaut1981 on creating multiple islands an still maintaining detail that gets inserted after step 7. Jump over there for the details!