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

[RobA]

RobA, I trying to follow your GIMP tutorial but failing miserable. What version of GIMP are you using and which noise, blur, etc filters are you using?

From all your examples this is an excellent method for creating coastlines.

EDIT
I found your first how to, which gives all the correct filter to use.

Only problem I have is when you add a mask to the layer I don't get the last option of selecting a channel, so I can select the Land mask. What could be the error? This is at the stage of creating sea contours. Which is also applicable to this how to using another method of multiple instead of overlay.

Are you in the right topic? I don't recall setting up channels in this technique.... (did you watch the video?)

By "failing miserably", can you give more information/post a result? The main problem I have seen is blurring too little compared to the entire image size. For example, if you are starting with an image of 3000x3000, a 100 px blur won't provide much of a random coast, it will look pretty much like the original hand picked blob...

-Rob A>

[DarkOne]

Your first "How to" did solved my failing miserable. I also using 1 version older GIMP that you that is probably why I missing the option to choose Channel on the Add Layer Mask.