Light, shadows, HDR, textures, size, resolution, brightness, contrast, saturation... retouching Photoshop, more as a generic term than as the official name of a program. There is a huge number of resources to improve photographs, but many graphic designers talk about the so-called visual center, which is different from the center of the image. Do you want an object or person to be placed at the visual center regardless of everything else? This simple online tool can help you.
Any image editor should be able to locate and report the mathematical center of an image, but there are times when a photographer or designer needs another kind of center: the visual one. Imagine an advertisement, something like a soda can. Unless the photographer intends to move it aside to show extra material, ideally it should be placed "in the middle". Of course... I already said it before: Photography is subjective. Some believe the visual center is important, while others directly talk about sin when it comes to "centering too much".
How to detect the perfect visual center
The point is that if you want a tool to automatically detect the visual center of an image, you already have it for free, directly in the browser. All the work is reduced to loading the photo in question and waiting for the results. The page reports the suggested movement percentages. I think it would be much more useful if it presented those values in pixels, but that's how it works.
It is necessary to highlight that Visual Center does not work for all photographs. In fact, I think that in most cases the casual photographer will not need to watch the visual center so closely, and the site made a couple of mistakes with some photographs I have here, since its suggestions led to "cutting" the object in question.
However, the situation is very different when it comes to a logo or another object that must dominate the center of our vision no matter what. For the rest, I think that following the famous rule of thirds should be enough. Experiment for a while, and share with us how it went.