1. What is additive color mixing? 2. What is subtractive color mixing? 3. What i
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Question
1. What is additive color mixing?
2. What is subtractive color mixing?
3. What is the hue of a color?
4. What is the saturation of a color?
5.What is the definition of color temperature?
6.Explain what geometric transformations the following PixelMath
formulas represent:
a.Source1(x, ymax–y)
b.Source1(y, x)
c.Source1(y, xmax-x)
6.Find the answers to the following modular arithmetic operations:
a.17 mod 5
b.45 mod 7
c.1003003001 mod 11
7. Explain the concepts: one-point perspective, two- point perspective, three-point perspective.
8.Explain how a digital image can be manipulated with a program to achieve the fisheye lens effect.
9. Explain the concept of perspective distortion. What are the factors that cause the perspective distortion?
10. What are anamorphic images? In Figure 6.14 (page 137) of Tanimoto’s book, find and describe the embedded camouflaged slant anamorphosis.
Explanation / Answer
1)Additive color is color created by mixing a number of different light colors, with shades of red, green, and blue being the most common primary colors used inadditive color system.
2)Subtractive color mixing is the kind of mixing you get if you illuminate colored filters with white light from behind, as illustrated at left. The commonly usedsubtractive primary colors are cyan, magenta and yellow, and if you overlap all three in effectively equalmixture, all the light is subtracted giving black.
3)Hue is somewhat synonymous to what we usually refer to as "colors". Red, green, blue, yellow, and orange are a few examples of different hues. The different hues have different wavelengths in the spectrum.
4)Color saturation refers to the intensity of color in an image. In technical terms, it is the expression of the bandwidth of light from a source. The term hue refers to the color of the image itself, while saturation describes the intensity (purity) of that hue. When color is fully saturated, the color is considered in purest (truest) version. Primary colors red, blue and yellow are considered truest version color as they are fully saturated.
5)Color temperature is a way to describe the light appearance provided by a light bulb (lamp). ... Typically, commercial and residential lighting application Kelvintemperatures fall somewhere on a scale from 2000K to 6500K.
6)
17 mod 5 ----->2
45 mod 7------>3
1003003001 mod 11------>0
7)
One point perspective is a drawing method that shows how things appear to get smaller as they get further away, converging towards a single 'vanishingpoint' on the horizon line. It is a way of drawing objects upon a flat piece of paper (or other drawing surface) so that they look three-dimensional and realistic.
Two-point perspective occurs when you can see two vanishing points from your point of view. Two-point perspective drawings are often used in architectural drawings and interior designs; they can be used for drawings of both interiors and exteriors. Some famous artists who used two-point perspective were Jan Vermeer and William Hogarth. Hogarth's The Marriage Contract shows two-point perspective while displaying a lively scene of people planning their children's futures.
Three–point perspective. : linearperspective in which parallel lines along the width of an object meet at two separate points on the horizon and vertical lines on the object meet at a point on the perpendicular bisector of the horizon line.
9)In photography and cinematography perspective distortion is a warping or transformation of an object and its surrounding area that differs significantly from what the object would look like with a normal focal length, due to the relative scale of nearby and distant features.
Causes for perspective distortion:
When a target is too close to a camera, the photo will show barrel distortion.
My flip cell phone's camera often produces barrel distortion.
Some lenses are intended to produce barrel distortion, such as wide angle lenses
10)An Anamorphic Image is an image that appears normal only when viewed from some particular perspective or when viewed through some transforming optical device such as a mirror.
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