Digital artifacts are unintentional, unwanted changes to photos that are a result of the internal workings of your camera. They can occur in both DSLR and point-and-shoot cameras and can degrade the overall quality of a photo. Here’s a look at the different types of image artifacts.
Imaging artifacts in radiography
Pixels on a DSLR sensor collect photons, which are converted into an electrical charge. However, occasionally the pixels collect too many photons, causing an overflow of electrical charge. This overflow can spill over into existing pixels, causing overexposure in parts of an image. This is known as blooming. Most modern DSLRs have anti-blooming gates that help dissipate this excess charge.
Chromatic aberration is most common in images taken with a wide-angle lens; it is visible as color fringing around high-contrast edges. It is caused by the lens not focusing the wavelengths of light at exactly the same focal plane. You may not see it on your LCD screen, but you will when editing. It is usually a red or cyan outline around the edges of a subject.
To avoid this, you can use lenses that consist of two or more pieces of glass with different refractive properties.
