I am trying to paint a texture but I encounter difficulties when I use Material bump, the bump looks pixelated, how to fix that?

I tried to increase the resolution (2048x2048 or 4096x4096...) of the texture, but there is no difference. enter image description here

enter image description here Also, here is an example (not the original) of the blend file: https://drive.google.com/file/d/1GX30KkplO8cjmk53oUR2M5V1ZwzrWe2j/view?usp=sharing

  • $\begingroup$ The resolution of your texture seems to be too low ? When you create the texture (Image/New...), you can choose the resolution, which by default- is 1024x1024.Try something way bigger, like 4096x4096 $\endgroup$
    – thibsert
    Commented Sep 3, 2021 at 19:15
  • $\begingroup$ I tried with your blend, and increasing the resolution definitively make a difference $\endgroup$
    – thibsert
    Commented Sep 3, 2021 at 19:25

1 Answer 1


From what I understand with b&w drawings and bump maps:

  • It needs to be PNG or EXR, not JPG
  • It needs to be 16-Bit Float or 32-Bit Float, not 8-Bit (if you paint it while 8-Bit, switch to 16-Bit Float or 32-Bit Float and blur or repaint)
  • It needs a high enough resolution (maybe increase it)
  • Enable Cubic instead of Linear in the Image Texture:

enter image description here

  • $\begingroup$ Wow, cubic interpolation seems to give really good results in that situation. I need to dig that deeper... Thanks Moonbots for the tip! $\endgroup$
    – thibsert
    Commented Sep 3, 2021 at 19:30
  • $\begingroup$ @ thibsert, still not perfect though, I think it used to work better, I hope they will fix it $\endgroup$
    – moonboots
    Commented Sep 3, 2021 at 20:58

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