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putting pieces of a map together

Apr 30, 2014, 02:38
Post: #1
putting pieces of a map together
hi there, i think im trying to to do something simple with my gimp program, but i may be wrong. i havea large map and i have scanned it into my computer in pieces. once i have it into gimp, i need to take the pieces and put them into a whole map again.

my guess has been that this is done with layers, but i have not been able to get much done with layers and my manual. i am seeking help in how to do this and thank you!
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Apr 30, 2014, 05:05
Post: #2
RE: putting pieces of a map together
Create a new canvas the dimensions of the original map and under advanced options set the x & y resolutions to the same dpi setting that you scanned each piece at eg 300/600/1200 dpi. (File->New)
Then Open as Layers each of the scanned images. (File->Open as layers)
Select the Move tool.
Arrange each layer on the canvas to it's correct position.
NB turning on (View->Snap to canvas edges) will assist you, plus Zoom to a high magnification to ensure alignment.
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Apr 30, 2014, 07:21
Post: #3
RE: putting pieces of a map together
(Apr 30, 2014 05:05)fluffybunny2 Wrote:  Create a new canvas the dimensions of the original map and under advanced options set the x & y resolutions to the same dpi setting that you scanned each piece at eg 300/600/1200 dpi. (File->New)
Then Open as Layers each of the scanned images. (File->Open as layers)
Select the Move tool.
Arrange each layer on the canvas to it's correct position.
NB turning on (View->Snap to canvas edges) will assist you, plus Zoom to a high magnification to ensure alignment.

The problem with using Gimp and scanned tiles (tile = one portion of the map) is the amount of memory consumed by creating large images with several layers.

Not impossible if you partially complete, export and start again but eventually Gimp runs out of steam and slows to a crawl making editing difficult.

There is a Gimp plugin, Pandora which assists but this is very simple (and old), you need to do a bit of pre-processing to straighten, maybe some alignment. Then it only stitches in rows, make the rows rotate 90 and stitch those together.

One of my old demo videos on using pandora http://www.youtube.com/watch?v=zBma6CT3mjY

A better bet is not Gimp but the panorama application Hugin http://hugin.sourceforge.net/ which does the rotate, and blending for you. I think it even stitches tiles vertically now.

Lots of examples on their web site.

If you are feeling adventurous, an application made for assembling tiles without using lots of memory.
NIP2 http://www.vips.ecs.soton.ac.uk/index.php?title=Nip2 Very academic. I have used it in the dim past, a bit of a learning curve.

Whichever method you use, try and have a reasonable overlap between adjacent tiles.

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