The image of a photo is a characteristic of a picture that primarily measures the perceived image degradation that is typically compared to an ideal or perfect image. Some imaging systems may introduce some amounts of distortion or artifacts in the signal so that the quality assessment is an important problem and is not ignored.Here are important factors that may affect the Photo Visual
This determines the amount of detail an image can convey. System sharpness is normally affected by the lens that is the design and manufacturing quality, focal length, aperture, and distance from the image center and also the sensor that is pixel count and anti-aliasing filter. Usually, in the field, sharpness is affected by the camera shake. In many cases, it is advisable to use a good tripod as it can be quite helpful. Focus accuracy and atmospheric disturbances that are thermal effects and aerosols can also factor in. Sharpening can restore lost sharpness, but then again, sharpening has its limits. The problem with over sharpening is that it can degrade the image quality by causing what is called halos to appear near the contrast boundaries. In other cases, however, images from many compact digital cameras are sometimes over sharpened to compensate for the lower image quality that occurred.
Noise is a random variation of image density, visible as grain in film and pixel level variations in the digital images. It usually arises from the effects of basic physics whereby the photon nature of light and the thermal energy of heat inside image sensors. Typical noise reduction software is meant to reduce the visibility of noise by smoothing the image, excluding areas near contrast boundaries. This brilliant technique works well, but it can obscure fine and low contrast detail specifically.
This is a very important but ambiguous image quality factor. This is because many viewers prefer enhanced color saturation in which the most accurate color is not necessarily the most pleasing. Nevertheless, it is essential to measure a camera’s color response because if its color shifts, then saturation and the effectiveness of its white balance gets distorted.
This is an aberration that normally causes straight lines to curve. It can be very troublesome for the photograph as it tends to be very noticeable in low-cost cameras especially an even when devices like phones are used as well as low-cost lenses. The good thing is that it can be corrected using software.