When we make a capture on our Mac or we are watching a preview a photo by pressing the space barWhether in a folder, in the Photos application, etc., we have a great option to maximize the image or put it directly to the native resolution momentarily.
This simple trick will allow us see the image in real size for as long as we want and then it will return to its normal state or directly view the image with full screen zoom. This can be useful to find a photo or detail of the mass when we use the space bar to preview it without going directly into Preview.
Increase resolution by pressing Alt
To perform this "trick" we have to perform a preview of the photo pressing the space bar, once open, all we have to do is press alt and the photo will zoom to full resolution with which it is made. This is not a new trick of the system, but surely more than one will use to remember it or know it in case you do not know of its existence.
Zoom the photo to full screen
We can also view a photo or capture that we have on the desktop in full screen by simultaneously pressing alt + space bar on the photo we want. By pressing both at the same time the image will be enlarged and zoomed to the maximum on the screen of our Mac. It also offers the options to share, minimize or close it permanently. In this sense we can leave the photo and zoom in until we get the maximum resolution and move through it to find or see what we want.