@Miraz and it's certainly confusing. I think perhaps this writeup from MDN explains what you meant?

“Note that the contents of the alt attribute should always provide a direct representation of the image and what it conveys visually. Any personal knowledge or extra description shouldn't be included here, as it is not useful for people who have not come across the image before.

One thing to consider is whether your images have meaning inside your content, or whether they are purely for visual decoration, so have no meaning. If they are decorational, it is better to write an empty text as a value for alt attribute (see Empty alt attributes) or to just include them in the page as CSS background images.”