Custom tiles - work but not seamless

[HaaG]

Hi, I have tried to create custom tile, it is 1024x1024 dimension with 1080 reso and edited in Photoshop to appear seamless, then converted to BLP. Outside of Wc3 it does appear seamless, but not inside wc3. Is there anything I Am missing? Thanks.
Question 2) I was also thinking if I can somehow insert a "Normal Map" as well? Or mix both of them into 1 texture then use it in wc3. But first need to solve the seamless problem anyway.

 

[Rush.]

Here my Opinion/Option/Checks:

1.Option: your tiles are not crossing seamless like this:

2.Option: You havent Import a Normal Map:

Create Normal Map with Gimp:

and Import it...
Option 3: You havent enough Variations:

Option 4: And this is a Important Point:
You have different Brightness in your Tiles/the colors do not match/ you have a bad transition

Better:

I Hope it helps

 

[HaaG]

Thanks! You are awesome! But one thing I didn't understand, how did you fix the variations and brightness? I come from programming background and don't have much art knowledge.

 

[Rush.]

In Gimp i overwrite the brighter places with the darker places with copy and paste and the healing tool for a better transition. Important is that the tiles transition is smooth.

Thats how i do it ^^
Good luck