Saving out 4k and 8k from photoshop

ISUther

Hello,

I am total noob in photoshop.
How to save out huge texture file with less resolution. I have 3 files the resolution is as you see in the picture.
This is file size i have all of those:

So i created New file:

It has 4 channels
RGB
RED - Contains file 1
GREEN - Contains file 2
BLUE - Contains file 3

And RGB shows em all as one now.
I need to save the file out as TIF and need to make 3 parts from that file using crop tool
How or what to change to target 4k and 8k
I dont know the size numbers to put in.
Issue is that my pc is crap and in mari cant handle this size of file very well

Axi5

4K = 4096
8K = 8192

Your image isn't square either, if this is VFX it doesn't matter so much, if it's real-time you will most probably want it to be a square texture.

ISUther

So Width i set 4096 and Height also 4096 for the new document i create but what do i put in to Resolution box (atm you see there is 300)

.Wiki

The resolution does not matter. Its only for print. The higher you put your resolution the smaller (in therms of cm by cm) your image will be in print.