the document is too big in size, that GIMP could not blur it, how should I do ?

[Jacktannery]

At a size of 2592 x 4768 you should be able to use small amounts of gaussian blur on a relatively modern computer without problems. I can on my old computer. Perhaps you are trying to blur it too much at once? Try blurring at 5-10 pixels and see if that works: it should be quicker than blurring at 500 pixels. You can repeatedly blur it in smaller amounts rather than trying to over-blur at once. Or just use the blur tool to blur it by hand.

If your computer is too old to blur at all a simple image of 2592 x 4768 pixels, you need to work at a MUCH smaller scale, as you will have increasing problems as you create your map and it gets denser and more complex. Try working at 2592 x 2384 (you can always make two maps of this size and then stick them together in the end) and see how that goes.

[hobbit604]

At a size of 2592 x 4768 you should be able to use small amounts of gaussian blur on a relatively modern computer without problems. I can on my old computer. Perhaps you are trying to blur it too much at once? Try blurring at 5-10 pixels and see if that works: it should be quicker than blurring at 500 pixels. You can repeatedly blur it in smaller amounts rather than trying to over-blur at once. Or just use the blur tool to blur it by hand.

If your computer is too old to blur at all a simple image of 2592 x 4768 pixels, you need to work at a MUCH smaller scale, as you will have increasing problems as you create your map and it gets denser and more complex. Try working at 2592 x 2384 (you can always make two maps of this size and then stick them together in the end) and see how that goes.

the thing is I tried to blur it in 4768pixels, but it doesn't have the blur effect at all, just the coastline color became light but the effect from the tutorial