Speckling (or Dither), which layers?

Hi everyone,

checking the FAQs I’ve found this page: https://help.spreadshirt.com/hc/en-gb/articles/207945305-Optimising-pixel-graphics-for-print

Here is said that one should use “speckle” or “dither” in raster images through the blending method “Diffuse” or other methods.

What I don’t understand is:

  • Should I apply this blending method to the white background layer only?
  • Or to every layer?
  • Or only to the layers with transparency?


Only for (half-)transparent layers, and only if they are directly on the shirt (without a background). It is to avoid a white outline where the color of the design fades into the color of the shirt.
There is no guarantee that it’ll work, though.


Ah! Now it’s clear. Thank you very much :smile: