I want to give my minecraft texture pack's clouds.png more variation, for example enabling overcast days. And to do this I increased the clouds.png size tenfold, giving me more space to draw clouds. When I test the clouds.png in-game some black overlay darkens the space between the clouds and I do not see the difference in transparency and different colour nuances I had expected. I can't get it to work. Yes, the .png has transparency.
How do I successfully up the size of clouds.png without causing the aforementioned issues?