How to eliminate the pixelation of an icon?

Question

Software testing

Hello. When developing the application, we encountered the following problem: the application icons look pixelated, although they were saved in the right size for ios with a resolution of 72 dpi (the right size) for android 120-140-160 dpi (the right size).
Tested on Ipad Retina, iphone 4s and Samsung Galaxy tab everywhere the same pixel.
What could be the problem here?
Thanks in advance for your replies)

Answer 1

For example, you need a 16x16 icon. Save it with four times the size, i.e. 32x32.
When outputting, reduce to 16x16. As a result, on retina screens of 16x16 logical pixels, which are just 32x32 physical pixels, a 32x32 icon will be inscribed and there will be no soap.

Answer 2

Firstly, on ios, developers do not have the concept of a pixel :) They work with points, and a point is half the size of a pixel (this is for the designer). Those. the designer makes a 52*52 pixel icon and saves it as [email protected] (@2x means this icon will be used for the retina display). For non-retina displays, nothing is currently being done. And the developer writes the size of the icon 26 * 26 points.
Secondly, for Android it is not necessary to keep dpi 120-140-160. It is enough to save everything at 72 dpi, but in two sizes. The developer will put these icons in special folders with different screen densities.
Thirdly, never forget about the pixel perfect.
And everything will be fine :)