An image is an artifact that depicts visual perception, such as a photograph or other two-dimensional picture, that resembles a subject—usually a physical object—and thus provides a depiction of it. In the context of signal processing, an image is a distributed amplitude of color.

An image is a visual representation of something, while a digital image is a binary representation of visual data. These images can take the form of photographs, graphics and individual video frames.

What is an Image?
An image is the visual representation of an object formed when light interacts with surfaces, such as mirrors or lenses. When light rays reflect off an object, they can create an image that resembles the original object.
Difference Between Object and Its Image
1. Definition
- An object is a physical entity that emits or reflects light.
- An image is a formed representation of that object, created by the light rays reflecting off a surface.
2. Formation
- Objects exist in real space and can be touched or interacted with.
- Images, especially those formed by mirrors, are virtual and cannot be touched; they seem to exist behind the mirror.
3. Location
- The object is located in front of the mirror (real space).
- The image appears to be located behind the mirror (virtual space).
4. Characteristics
- The object has a size, shape, color, and texture.
- The image may be upright or inverted, depending on the type of mirror used (concave or convex).
5. Types of Images
- Real images can be projected onto a screen and are formed by converging light rays.
- Virtual images cannot be projected; they are formed by diverging light rays and are seen when looking into a mirror.
Conclusion
Understanding the differences between an object and its image is crucial in the study of light and reflection. This knowledge helps in various applications, from basic optics to complex imaging systems.