I`m trying to create a banded gradient with Photoshop, similar to the one pictured on this packaging:
Can I achieve this with a normal gradient in Photoshop or do I have to create this rectangle by rectangle?
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It's probably easiest to create this by hand, or rectangle by rectangle. One way to somewhat recreate this is by going to Filter > Filter Gallery > Artistic > Cutout and playing with the settings in there. I got this, really quickly:
It's not the prettiest or most precise, but maybe that is because of the gradient I chose.
Another way is to change the color mode to Indexed (Image > Mode > Indexed Color) and then fiddle with those settings, but this still doesn't produce exactly what you're looking for.
That's why I think it's probably best to do it by hand. Maybe there is a method I don't know of yet, but these are the two I've seen used for this. Most people want to remove the banding, so it's hard to find resources for creating it.