How can I create these types of gradient images in Photoshop or Illustrator?
I don't understand how they made these swooshes.
Your help is much appreciated.
On Illustrator use the mesh tool as Lucian say, you can move the vertex around. Try different grid density.
In Photoshop you can simply make some blotches of color and use the smudge tool. The trick is to test a different radius and pressures.
Danielillo pointed another method using a general Gaussian blur. How to create an image with complex gradient?