The science behind taking photos

The human eye and a camera function differently. The eye uses a dynamic, biological process involving the brain for interpretation, whereas a camera uses a mechanical lens and a static sensor to capture light.

In bright sunlight, there is an abundance of light. To prevent overexposure, one must decrease the aperture (use a higher f-stop number) to restrict the amount of light entering the camera.

Ambient light refers to the natural or existing light in a scene that is not provided by the photographer. The Sun is the primary source of natural light, whereas lamps, candles, and fires are considered artificial or supplemental light sources.

A shorter (faster) shutter speed captures the subject for a smaller fraction of time, which freezes motion and prevents blur in the resulting image.

To open the shutter 2 times longer than 1/200 of a second, you need to double the time duration. Doubling the time (1/200 * 2) results in 2/200, which simplifies to 1/100 of a second.

Shutter speed controls the duration that the camera's sensor or film is exposed to light. By adjusting this, the photographer directly influences the total light reaching the medium.

Focusing is the process of adjusting the lens elements so that light rays from a specific point in the scene converge at the same point on the image sensor, creating a sharp image.

The aperture is the adjustable opening within the lens that controls the amount of light passing through to the camera sensor.

The Law of Reciprocity in photography states that the total exposure is determined by the product of the intensity of light (aperture) and the duration of exposure (shutter speed).

Exposure is the total amount of light that reaches the sensor, which is determined by the aperture area, the length of time the shutter is open, and the sensitivity (ISO) of the sensor.

Diluting the intensity of a color means making it less saturated. Adding white light to a color increases its brightness and reduces its saturation, effectively diluting it.

Saturation refers to the intensity or purity of a color. A highly saturated color is vivid and intense, while a low saturation color appears washed out or gray.

Luminosity, or tonality, refers to the lightness or darkness of a color. It describes the brightness value of a specific area in a photograph.

Hue is the attribute that differentiates colors (red vs blue vs green). Value, saturation, and luminosity are different color properties.

Color is typically defined by hue, intensity (saturation), and value (luminance). Detail or definition is a property of image sharpness, not a component of color itself.