Visual tech Flashcards
In 3D graphics, how is the strength of specular reflection typically controlled?
By adjusting the roughness of the surface.
What are the three main light sources in a scene?
Direct sunlight, ambient light from the sky, and reflected light from surfaces.
What is the terminator in lighting?
The area separating light and shadow on an object, often the darkest area due to reduced illumination.
What is Diffuse scattering?
A phenomenon where shorter wavelengths (e.g., blue) are scattered more than longer wavelengths, causing the sky’s blue hue.
What is three-point lighting?
A foundational setup in film and photography consisting of a key light, fill light, and rim light
What does the rim light do?
It creates a highlight around the edges of a subject, enhancing depth.
What effect does front lighting have on a subject?
Flat images with minimal texture.
How does side lighting enhance objects?
It adds depth and dimension by creating dramatic shadows.
What is the purpose of backlighting?
It creates silhouettes and highlights edges, often used for dramatic effects.
What are form shadows?
Areas on an object where light cannot reach
Why are shadows rarely black?
They often contain hues influenced by surrounding light sources
What are cast shadows?
the shadows projected by an object onto a surface when the object comes between the light source and the surface.
What is diffuse reflection?
When light is scattered in many directions by a rough surface.
What is specular reflection?
Clear reflection from smooth surfaces, where light rays reflect at equal angles.
What is the difference between transparency and translucency?
Transparency allows light to pass through clearly, while translucency scatters light, creating unclear images
What are the three properties of color?
Hue (the actual color), saturation (intensity or purity), and value (lightness or darkness).
What is the RGB color model used for?
Digital displays, where combining all colors results in white.
What is a complementary color scheme?
Colors opposite each other on the color wheel
What is the rule of thirds?
Dividing an image into thirds, both horizontally and vertically, and placing important elements at intersections
What is the exposure triangle?
The combination of aperture, ISO, and shutter speed controlling light exposure in photography.
What causes overexposure?
Too much light hitting the sensor
What is ISO?
The sensitivity of the camera sensor to light
How is pixel count calculated?
By multiplying the width by the height of an image
What is the difference between lossless and lossy compression?
Lossless preserves all original data (e.g., PNG), while lossy reduces file size at the cost of slight quality loss (e.g., JPEG).
