I'm trying to create a pixelart picture and I'm having problems with background. I need to do this effect:
Is a gradient but I think is not created with Aseprite Gradient Tool. And in PS I don't know how to do it.
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The following is for Photoshop, I don't know much about Asperite, sorry.
Something like this
Use the gradient tool to make your background using the custom gradient you made previously.
For the banding, do Image > Mode > Indexed, and use the settings shown below, something like 11 colours should do the trick. You can set it to however many you want.