So how do you do that action line blurred background stuff

[DokiDokiTsuna]

Like this:

It was actually pretty hard to find this; I don't think modern action anime has much use for these ^^;. However, I don't have a team of BG artists at my beck and call, so I'm gonna need 'em.

I'm not really sure how to translate this into my usual cel-shaded style, though...I thought, if I could hear other people's strategies/techniques for making them, I could figure one out for myself.

[magnavarra]

just draw some lines above gradient an use motion blur and stylize\wind in photoshop for that bike distorion on the bottom

[darthmongoose]

One way is to use the PS gradient tool, but rather than "solid" set the mode to "noise" and roughness high, then when you've dropped the extremely colourful stripey madness down, use "gradient map" to reduce the colours to something less wacky.

Another is to place down a bunch of diamonds or long pointy ovals with the shape tool and use filter> blur> motion blur turned up high.

[nathanKmcwilliams]

I go ham and draw a bunch of speed lines then dupe that one as many times as needed and change the color of the lines.

Then I'd throw a gradient behind it. And in front of it with a lower opacity and either an Overlay or a Light layer type.

After that I'd just start using motion blurs on whatever layers I like until it looks good.

[rajillustration]

I use motion blur for this, but if you really want to emulate the technique done in old fashioned anime, those were done with sponging on wet acrylic. You can simulate the effect with a painterly digital brush that pushes the paint that's underneath it (in photoshop it's called a mixer brush, I forget what it's called in clip studio)