Hi, currently i just downloaded Redux2 cloud from chrome and i decided to edit in photos and higher the brightness of the clouds and when i was done i save it and put it in my Texpacks folder and when i join my world i enable the pack and this is what it shows below:

redux2Cloud (1).zip

The app you used to brighten it left the edges darker. Meaning there will be obvious dark lines when the clouds repeat. You should use something else to edit them.