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I was wondering if anyone knew or could point to a tutorial of how to create this type of gradient.
How is it done with three colors and with such a smooth transition between the colors without banding?
Draw a bunch of gradients from color to transparent and stack them on top of each other. I used 5 main colors to replicate it.
On the left side from bottom to top a dark blue, a magenta, and a red. Then on the right side from top to bottom orange and light blue: