Image Basics
Color Hue: pure color, presented by a circle Saturation: purity of color, how far it is from pure white, which is every color combined Brightness: subjective perception, how far it is from grey Luminance: objective, cd/m2 Contrast: Sharpness: Noise Image noise is random variation of brightness or color information in images, and is usually an aspect of electronic noise. Gaussian noise Salt-and-pepper noise Shot noise Quantization noise Film grain Anisotropic noise Periodic noise Photography Backlight The process of illuminating the subject from the back. The lighting instrument and the viewer face each other, with the subject in between, creating a glowing effect on the edges of subject, which helps to seperate the subject and the background. In photography, a back light (often the sun) that is about sixteen times more intense than the key light produces a silhouette. ...