Why I see duplicated textures on my 3d surfaces? How to make tileable texture?

This often happens when we use picture taken from us s a texture. The best solution is to take pictures with cloudy sky. Thus light evenly spread solves the origin of the problem.

But what if we have a texture and the brightness is not uniform? Inevitably give signs of duplication .. how to solve the problem and make tileable texture?

I found here my inspiration: we use a photoshop filter called High Pass Filter!
Watch the video and everything will be clear!

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Resuming, this is the right workflow to understand how to arrange the levels on photoshop:

( Texture from fantastic  Mayang collection – link texture )

So, here the 3 steps to balance luminosity:

1. Duplicate the layer
2. Apply it Filters> Other > High Pass Filter (choose the right vaule in order to preserve details)
3. Assign it  ”Luminosity“

I hope this simple tutorial can help you to create wonderful tileable textures!