Creating great looking seamless textures is no easy matter.
step 1: remove dark & red patches
I have to be very careful to not lose any of the wonderful detail of this texture.
If you aren't careful, cloning can quickly destroy a texture.
I want to minimal adjustments to the image to get it to tile nicely
If I want this thing to tile I needed to remove the yellow and red patches.
I create copies of the image and flip them vertically & horizontally to create more variation.
I am always cloning 100% hard. Soft edges can also ruin a texture.
That last adjustment make the image too noisy.
I will need to remove some of the bumps and ridges
I chose a square portion of this texture, used the offset filter and went to
work on making it seamless.