2

wasn't sure how to phrase this so I thought I'd post an example of the kind of effect I'm looking for.

enter image description here

I understand that this could simply be made with the gradient tool but not sure how to get the 'spread'

any help would be massively appreciated.

3

It looks like it might just be a regular linear gradient that has been masked using a radial gradient.

You can create custom gradient using the gradient editor.

For example:

enter image description here

Then over a black layer, I filled a new layer with the Rainbow gradient I made. Then I used a black and white gradient to create a layer mask consisting of a radial gradient, which I stretched into an oval.

For example:

enter image description here

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  • Perfect Billy, thanks for the advice – teddycreative Sep 18 '19 at 10:35
  • one minor suggestion: sometimes gradients suffer from banding. An easy way to avoid the banding problem is to make a document set to 16-bits-per-channel RGB; make the gradient; then convert the document mode to 8 bits per channel. You get some dithering noise but there will be no banding. – Yorik Sep 18 '19 at 20:10
  • @Yorik - absolutely. – Billy Kerr Sep 19 '19 at 1:07
2

Just in case the problematic colored area is the smaller one which contains everything that a rainbow has you can try this:

Have a black background layer. Then you make the colored shape to a new layer. In Photoshop you can draw a path, convert it to selection and and fill the selection with a gradient:

enter image description here

(sorry for irregular looking path, you can get easily better result in Illustrator where working with paths is much more comfortable - copy the result and paste it to Photoshop)

Then apply Gaussian blur:

enter image description here

If the edges seem too thin, undo and try smaller blur radius.

You can also duplicate the layer once or more times and merge the duplicates. It can be a good idea to squeeze the duplicates vertically to avoid the shape becoming too high. It's tried here:

enter image description here

If you merge the gradient shape with black BG before blurring it's possible to restore the gradient fidelity to some degree with curves:

enter image description here

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