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Making Images seamless horizontally or vertically only (for "The GIMP") .

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If you try the "Make seamless" plug-in in GIMP, it will make the image seamless both horizontally and vertically at the same time. It will not allow you to make it seamless in only one dimension.
This instructable will help you to make images seamless in only the dimension of your choice.
 
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Step 1: Open the image in GIMP .

Picture of Open the image in GIMP .
(Lets call the default layer the "base")

Step 2: Select and copy the left 1/3rd of the "base" layer.

Picture of Select and copy the left 1/3rd of the

Step 3: Paste it in a new transparent layer

Picture of Paste it in a new transparent layer
Let us call the new layer "left on right".

Make sure you paste at the right 1/3rd of the image.

Step 4: Select and copy the right 1/3rd of the "base" layer.

Step 5: Paste it in a new transparent layer

Picture of Paste it in a new transparent layer
Let us call it "right on left".

Make sure you paste it at the left 1/3rd of the image.

Step 6: Add white layer masks to both the new layers.

Picture of Add white layer masks to both the new layers.

Step 7: Blending the masks. Step1

Picture of Blending the masks. Step1
Select the "blend" tool - use the "Foreground to background" gradient, linear blend mode.
(make sure the 2 colors are black and white)

Step 8: Blending the masks. Step2

Picture of Blending the masks. Step2
On the layer mask of "right on left" layer, draw a gradient from exactly 1/3rd of the image, all the way to the left boundary of the image.

Step 9: Blending the masks. Step3

Picture of Blending the masks. Step3
On the layer mask of "left on right" layer, draw a gradient from exactly 2/3rd of the image, all the way to the rightmost boundary of the image.( or you can also copy "right on left"'s mask and paste it on "left to right"'s mask and flip it horizontally)

Step 10: Crop away 1/6th of the image from left and right each

Picture of Crop away 1/6th of the image from left and right each
anytiler-step8b.jpg

Step 11: Testing & Finish

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With these, the image will now be seamless horizontally, retaining the nature of the image vertically.

To test, use the "tile" plug-in. It is at various places in different versions. So i wont instruct on how to use it.

These instructions were for making an image seamless horizontally. You can adapt them to make images seamless vertically only too.
CptnEdge4 years ago
What version of Gimp are you using? I have version GIMP 2.6.3 I'm trying to learn it but I think each new version is a little different. Would appreciate any help possible. Thanks, CptnEdge
kamathln (author)  CptnEdge4 years ago
Currently, 2.6.5 . But if you are asking which version of GIMP I used for the instructablee, I am guessing 2.3 or 2.4, I can't remember.
Okay thanks I'm using 2.6.3 I'm learning slowly but am proceeding nicely. Is the difference in the newer version 2.6.5 worth upgrading too?
kamathln (author)  CptnEdge4 years ago
GIMP Changelog . Read and suit your self. If you dont understand or need more input, there is always Mailing lists. I suggest the GIMP User mailing list.
I've had a problem with completing this as seamless as possible. I was doing this with a picture of the ocean and the picture was slightly tilted thus giving me an unsightly jump on the horizon. Any tips on to fixing that?
kamathln (author)  aetherguy8816 years ago
Not much :-( except Rotate and crop ;-)
Cool! I like it. I have a similar instructable here:
http://www.instructables.com/id/Creating-Seamless-Tiled-Wallpaper/
Patrik6 years ago
Even easier: tile 3 copies of your original image vertically, use the "make seamless" plugin, then cut out the center third of the resulting image...
kamathln (author)  Patrik6 years ago
... and people called me genius.. doh. ;-)
kamathln (author)  kamathln6 years ago
I tried this.. It does not work. The result is not tilable horizontally or vertically. The problem is, the "make-seamless" plug-in uses the "gradient" in "symmetrical conical" mode when blending. This makes the image untilable when only the center third is cut. Never the less, keep trying .. I have a feeling that you are in the right path.. just not yet reached there ;-) .. You might make my 9 step instructable obsolete with a single liner. :-D
Patrik kamathln6 years ago
Ah - I'd assumed you used the same method as the plugin. If the plugin worked the same way, this method would work. To quote Donald Knuth, famous computer science pioneer, "Be careful about using the following code - I've only proven that it works, I haven't tested it." :-D
kamathln (author)  Patrik6 years ago
The logic of the thought process they used to arrive at their method was same. But in their method, they use "symmetric conical" blend to make all sides seamless and they "shift and wrap" a duplicate layer in both x and y dimensions, whereas I use "linear blend" and "shift and wrap" only in one direction.
kamathln (author) 6 years ago
Thank you all for the praises. I am highly encouraged :-)
ScottSEA6 years ago
Well done. Great Instructable.
AWSOME DUDE i would have never figured that out
Genius! Never thought of this, I always wondered how they did this with the pictures! +1 rating.
mikedoth6 years ago
+1 for using and open-source program.
kamathln (author)  mikedoth6 years ago
Thanks.. I live - eat - breath - sleep Free and Open Source Software :-)
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