Make Seamless
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Menu -> Image -> Make Seamless

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Prepares an image for use as a tiled texture. You can blend the
edges of an image to create a seamless texture.
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Horizontal Shift and Vertical Shift
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You can shift the image by setting a value of the shift for X and Y.
The bitmap inside the selected layer or image background is shifted
horizontally and/or vertically and the edges are blended.
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Preserve Size
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If you want to retain the size, select the check box "Preserve
size".
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You can press the F11 key to show the image in Full Screen Edit
mode.
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How to prepare an image for use as a tiled texture
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With
the Make Seamless tool -