How to fix seams in cubemap faces to equirectangular?

Question

I am trying to convert 6 cubemap faces to equirectangular.

I created the skybox.blend by the following steps:

1. Create a box mesh
2. Assign 6 materials on it
3. Assign face texture on material
4. Create a camera on the box center
5. Change the Panorama Type to Equirectangular
6. Do rendering.

Here is the rendering result:

There are lots of seams on the edge of the face.

How can I fix the seams ?

Answer 1

Your textures are too small and the filtering in the Image Texture node makes the colors of the top (white ceiling) bleed in the bottom when the tiling is set to Repeat.

The best you can do is setting the filtering to Closest (no filtering so visible pixels) or, if you want to keep the filtering, set the tiling to Extend to minimize the bleeding.