: Should there be "seams" at the edge of the "tiles" when I fill using an image as a pattern in Gimp? I want to visualize what an image(768x1024) looks like when it's scaled down and tiled.
I want to visualize what an image(768x1024) looks like when it's scaled down and tiled. I use Gimp, so I select, ctrl-scale to something small (whateverx180), select, copy, edit/paste as../new pattern (give a name, save), then I open a blank white canvas, and fill with the pattern:
Is it the expected behavior of the tool that I see those seams (the background color filters through) on the edge of the individual pattern?1
1. It doesn't happen with the default patterns supplied. And I can fill the canvas with blue first to avoid it. The affected area parameters don't change the result. I made a comparison using Imagemagick's montage, and it tiles without those seams. I am a beginner.
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The fill tool doesn't add seams, it simply repeats the pattern putting it as adjacent tiles.
The problem could be into the way you have resized your original image.
When you scale a bitmap image, you create a new image with a different number of points, and the information used for the values of the pixels of the new image is obtained using an algorithm (in GIMP you can choose between several formulas).
Depending on the method used, you can obtain different results. Sometimes the operations introduces artefacts (in your case it seems a Moiré pattern).
You can change the scaling method or correct directly the resized image.
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