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

[Jacktannery]

I'm not sure I understand the problem. You are trying to blur the image using Gaussian Blur and you entered in the little box a (whopping) 4,768 pixels. Then you pressed ok and your computer froze? Or actually it seems that the image became so blurred that you couldn't see anything at all?

In either case, don't blur something by 4,768 pixels at once. Instead, try blurring it 500px and see how that looks, then repeat as necessary. I had a look at RoB A's very good tutorial, and he just says (in post 6) that you need to Apply a Gaussian Blur (Filter->Blue->Gaussian Blur) large enough to eliminate the absolute black and whites of the image. So do 500px once, then again if that was not enough, and so on until you have a nice smooth image full of greys.

[hobbit604]

I'm not sure I understand the problem. You are trying to blur the image using Gaussian Blur and you entered in the little box a (whopping) 4,768 pixels. Then you pressed ok and your computer froze? Or actually it seems that the image became so blurred that you couldn't see anything at all?

In either case, don't blur something by 4,768 pixels at once. Instead, try blurring it 500px and see how that looks, then repeat as necessary. I had a look at RoB A's very good tutorial, and he just says (in post 6) that you need to Apply a Gaussian Blur (Filter->Blue->Gaussian Blur) large enough to eliminate the absolute black and whites of the image. So do 500px once, then again if that was not enough, and so on until you have a nice smooth image full of greys.

oh, actually, the blur problem was solved, but I do have another question i'll be so appreciate if you can help in this thread, it is also from the same tutorial

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http://www.cartographersguild.com/tu...l-rpg-map.html

when I was going through "Post 4: I have an idea – part 2" , in the second last step of this section, the author said to------------ :"Now Invert the selection (Select->Invert), create a new black layer called “Land Mask” and fill the selection with white. Now save the selection to a Channel (Select->Save to Channel) and rename the channel to “Land Mask”. ----------------


I had no idea where to create a new black layer, I tried "transparency" "white" "background" "foreground" none of them give me the black ground, so led to the failure of "save to channel" part, that