Preparing image for Facebook

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Alright, I’ve conducted some tests with my facebook page and most of the sizes/methods suggested in this thread.
I tried:

  1. parameters suggested by @D_W ;
  2. parameters suggested by Harry Durgin;
  3. compression method suggested by @chroma_ghost

For all methods I used portrait orientation image produced in PNG and JPG formats.

  1. @D_W 's parameters yielded the best result. The best file extension is PNG. The best dimension is 2048 px. However, I must say that this 2048px length is not applicable only to the width, as suggested by @D_W in the article. Pursuant the Facebook’s guidelines, and as here tested by myself, 2048px should be the longest side, i.e. which ever is longer: 2048px max width for landscape orientation OR 2048px max height for portrait orientation.

  2. @harry_durgin 's parameters were not the best, though not the worst, comparing to Facebook’s recognized 720/960/2048 px dimensions. Right in the middle as also seen from the figures.

  3. although @chroma_ghost did not suggest any exact parameters, I decided to pick something from his advice too. I tried this https://tinypng.com/ and, my PNG dropped sweet -69% of its size. However, color artifacts were noticeable in saturated areas. (I will also try the ImageOptim later when I have time).

So, the conclusion I’ve made, with your kindly provided advice, is the best parameters for Facebook are: PNG image with 2048px longer side

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