install GIMP 2.10.18 ( https://www.gimp.org/ ) using this link then make a TRANSPARENT canvas it can eather be 4096x2048 or 2048x1024 res
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STEP 2
go to filters+render+noice+solid noise
set the X and Y values very high
set the detail to maximum
turn on tileable so there are no seems
click on random seed untill you find a texture you like
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STEP 3
make air currents by using the warp tool and dragging the clouds untill you get what you like|
dont froget to add some small stormes
but when your working near the edges you dont want to make seems so to avoid seems you go to layer+transform+offset
then click by width/2 and that brans the edges to the middle so you can work on the edges when done offset the image back to normal by clicking by width/2 again
- mine looks like this so far
Added after 5 minutes 40 seconds:
STEP 4
go to colors+levels
you should see the thing in the pic below the step 3 explanation
use the input levels thing to make the image blacker this decreases the amount of clouds
dont make the image to black though
- this is what you should see when you opened up levels
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now once your done with step 3
its time for step 4
STEP 5
left click the image if your using a mouse
you will see a drop down bar
go to layer+transparency+color to alpha
then using the thing that pops up when you click color to alpha you make the black transperent
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then your done with the texture
export/save it as
"picturename.png"
DONT PUT IT AS JPG BECAUSE THAT WILL MESS UP THE TEXTURE!
Added after 3 minutes 30 seconds:
then you can put it on any planet you want in celestia
