differential photo的意思|示意

Differential photos (also called anaglyphs, stereo pairs, or stereopairs) are two photographs of the same subject taken from slightly different positions. When viewed through special glasses, the two photos merge into one to create the illusion of depth, giving the image a 3-D appearance.

Since the early 1800s, special viewing devices and techniques have been used to present 3-D images to viewers. The concept of anaglyph photography was first developed in 1853 and continued to advance through the end of the 19th century. It wasn't until the mid-20th century, however, that stereo photography became widely used.

Today, differential photos have become much easier to produce and view. Most digital cameras have a “stereo” setting, allowing users to take two pictures of the same subject from different perspectives. In many cases, you can use a single camera to take both photos as long as it has the option to manually adjust the focus or can be mounted on a tripod so that it can be turned slightly in between shots. After the two photos are taken and uploaded to a computer, they can be merged into one with photo-editing software and viewed with 3-D glasses.

It's important to note that the two photos must be taken from slightly different angels in order to achieve the 3-D effect. Most cameras have an automatic setting that will adjust the lens as needed, but it is important to position the camera correctly so that the lens is precisely aligned with the subject.

Differential photos are used in a wide variety of photography, from nature shots to family portraits, from astronomy to art. They can also be used to create special effects, such as a “floating” image, or a picture of a person that appears to be coming out of the screen in 3-D.

Differential photos offer viewers a very immersive experience, as if they were actually standing in front of the subject and peering into its depths. If you're interested in creating 3-D images and adding a new dimension to your photography, differential photos are a great place to start.