Strange seams appearing during render

I’ve textured a tree with a bark texture that gets repeated a few times. When looking at the textured tree in the viewport, everything looks fine, but when I render the scene little seams show up on the trunk.

The texture repeats correctly, and I’ve checked the actual numeric positions of the UV’s, which are all exactly in place: (0, 0) (1, 0) (0, 2) (1, 2). I’ve attached an image so you can see what is going on.

The first 2 panels are shots from the viewport. The cube is an empty I use to target the camera. As you can see, the viewport renders the texture without anything funny appearing. The 3rd panel is my uv map for the trunk. The final panel is a blender render with the troublesome seams pointed out.

I would either try a different filtering option for the texture or double-check it in a paint program to make sure there isn’t anything near the edges breaking the seamless effect.

Thanks for the suggestion. I was able to get rid of the seams by adjusting the Filter Size setting.

Texture Tab > Image Sampling Panel > Filter > Filter Size

Dropping the value to 0.1 (the minimum) from 1.00 caused the seam to disappear.

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I just thought about it, those lines are probably the edges of the source image for your bark texture. Watch where the edge of your mess is with respect to the image used for uv, especially if the image is set to be repeated.