Säritamist

Säritamist refers to the process of exposing a photosensitive material, typically photographic film or a digital image sensor, to light. This exposure is a critical step in creating an image, as it captures the light information that will form the final picture. The amount of light that reaches the photosensitive material is controlled by a combination of factors, primarily the aperture of the lens, the shutter speed, and the sensitivity of the film or sensor, known as ISO. These three elements are collectively known as the exposure triangle.

Achieving correct säritamist is essential for a well-exposed photograph. If too much light reaches the sensor or film, the image will be overexposed, appearing too bright with loss of detail in the highlights. Conversely, if too little light is captured, the image will be underexposed, appearing too dark with loss of detail in the shadows. Photographers manipulate the exposure triangle to achieve the desired brightness and creative effects. For example, a wide aperture (small f-number) lets in more light, suitable for low-light conditions or to create a shallow depth of field. A fast shutter speed freezes motion, while a slow shutter speed can create motion blur. The ISO setting determines the sensor's or film's sensitivity to light; higher ISO values are useful in dim light but can introduce digital noise or grain. Modern cameras often offer automatic exposure modes that calculate the optimal säritamist for a given scene, but manual control allows for greater artistic expression and technical precision.