I am having an LCD with a resolution of 640x480. What is the relevance of pixel per inch for an image to be used for developing a GUI in this LCD? This image is not going to be used in any other LCD's with different resolution. According to me , this option is irrelevant as actual pixels per inch is constant in the LCD .

But I found that in GIMP we need to give this option to create an image. What value should I give for my image ?

enter image description here

  • as said in the answers, PPI is only important for printing purposes. 72 (usually the default) is fine.
    – Luciano
    Commented Jan 22, 2016 at 10:44
  • Note that the ppi setting may influence some of the plugin/effect/text rendering, but that will depend on the software and the plugin tool.
    – Yorik
    Commented Jan 22, 2016 at 20:09

2 Answers 2


As you said, the ppi is irrelevant, because you're not actually printing anything. For your purposes, ppi is just a meta-tag that won't change anything. (See https://bjango.com/articles/ppiisatag/)

I would just leave it at the default of 72.


The value of “72 pixels per inch” does not actually refer to a display with 72 pixels per inch. It means “1:1 pixel ratio” or “show each pixel of this image on one pixel of the display.” It is essentially a zero point on the resolution ruler.

So when you don’t care to specify a pixel per inch setting, you use 72 pixels per inch.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.