@jslayton - I think it should be possible to get this result with most maps where the MAP BORDER green rectangle coincides exactly with the background and if you hide the decorative frame (if there is one). I'm very convinced that it happens as a result of antialiasing the edge of the map, and because the usual drawing area and/or SCREEN is white.

EDIT: yes - I can make the map I have open do it if I hide the frame I gave it and export a rectangular section. In this case the antialiasing (set to 66%) has mixed the line of pixels at the outermost edge with the white of the screen and turned them all noticeably paler. If the AA was lower it would be probably be even more noticeable.

Here is the same thing again with only 20% AA

I had to re-show the layer boundary in GIMP so you could see it against the pale background there.

But maybe it's nothing to do with the AA (proving the first part of this comment is actually wrong). Here it is again without any AA

I think this may be why most styles have at the very least a black outline rectangle as a visual frame.

The other thing I've only just noticed after 5 years mapping with CC3 (I always usually have a decorative frame so don't ever see this normally) is that there are 2 pixels of white on the top and left hand sides, where there is only one pixel of white on the bottom and right hand sides.

Another thing I've only just noticed is that despite there being no AA at all on this last image the white isn't pure. It contains tints of the colour from the map. Here (below) I have manipulated the Gamma to show these up clearly for what they are - apparently random colours.

A further experiment proves it is the screen the render is capturing, even though the rectangle being picked is exactly the map extent. Here I have kept the same settings as before but turned the screen black.

When you Save as... click the Options button and check the Crop image to aspect ratio and Restrict image to map border boxes.

That should crop out all the white stuff around the outside edges of your map.

To hide the legend you will need to hide the sheets those parts are on before you export the map.

Kind of reminds me of the root bridge grown by Maleficent, in Mistress of Evil

Love your drawing style, Hans :)

@Quenten - First, download the content from the files that come up when you log into your user account and click the Downloads tab. They are under your CC3+ registration.

When you install them and allow CC3 to start up at the end of the process you will see that they have been incorporated into the Structures catalogue for the style, which means they will have been added to the Structures folder (if you are looking for the actual png location). You don't need to do anything or modify the catalogues. All that is done for you.

You don't do things by half!

It's taken me a couple of years to get where I am with making seamless textures for overland, city and dungeon maps, which are relatively easy to do compared to Per. Some seamless textures are easier to make than others. It depends a lot on the scale of the objects in the pattern, and the overall size of the tile. So for example a 3000 px seamless tile stands a far better chance of looking ok than a 1000 px tile of the same kind of thing.

I'm not sure I understand how you are going to use this texture over a large area if it doesn't tile.