I see I can adjust my image between 8, 16, and 32 bits per channel, and when I create a new image I can choose between bitmap (1-bit) or 16-bit+ in all the other modes.

Is there a way to do a 4-bit mode? I'm trying to do some image editing for some e-ink displays (16-color grayscale, aka 4-bit) but I cannot for the life of me figure this out in Photoshop CS6, and most google results are just 'how to make an image greyscale'.

Alternatively, what software could I use to create and edit images in a 4-bit grayscale mode?

  • The mode is called indexed
    – joojaa
    Aug 5, 2017 at 5:28

1 Answer 1


I have a suggestion, but i don't know is it what you want or not.

  1. Make Image Grayscale (Image-> Mode-> Grayscale)
  2. Press Alt + Shift + Ctrl + S
  3. Change the values as following image enter image description here
  4. Finally press save button

this will save your image as a gif image. you can open it in Photoshop again and save it as a jpg file. but I dont know does it work for your purpose or not!!!

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