How do I convert an image to 5 grades of gray in photoshop?

I want to do some shading exercises and I have a 5 values scale from white to black with 3 shades of gray.

How can I convert a picture to have only 5 colors in photoshop?

I know how to convert it to gray scale but I don’t know how to take it further to only 5 colors.

Thanks

Answer

There are many methods including using Image > Adjustments > Posterize, or alternatively Filters > Artistic > Cutout – then you could tweak it with a levels or curves adjustment layer to make the lightest colour white, and the darkest black.

For example:

enter image description here

Another method in which you can control all the colours exactly is to convert a greyscale image to Indexed color mode. Then simply create a custom colour table.

For example:

enter image description here

Another possibility is to create a gradient, and apply it as a gradient map adjustment layer.

For example:

enter image description here

Attribution
Source : Link , Question Author : costa , Answer Author : Billy Kerr

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