Tutorial # 9 – Q#6.16 from textbook Nov. 21,

The following 8-bit images are (left to right) the H, S and I component images from Fig The numbers indicate gray-level values. Answer the following questions, explaining the basis for your answer in each. If it is not possible to answer a question based on the given information, state why you cannot do so. 2

A) Hue B) Saturation C) Intensity 3

4  A)Give the gray-level values of all regions in the hue image A) Hue

HSI Model 5 id_cone_chroma_gray.png

Hue Need to find Magenta, Blue and White

7

8  B) Give the gray-level value of all regions in the saturation image. 255 B) Saturation

Saturation 9  Gives a measure of the degree to which a pure colour is diluted by white light  “The colourfulness of a stimulus relative to its own brightness” (Wiki article) e:HSV_color_solid_cone_chro ma_gray.png

10  The colours are spectrum colours – they are fully saturated.  255 applies to all colour regions  Center of the circle is white, so saturation is B) Saturation 0 255

11  C) Give the gray-level values of all regions in the intensity image C) Intensity

Intensity 12  Brightness, lightness  “Attribute of a visual sensation according to which an area appears to emit more or less light”  “Amount of light passing through a particular area e:HSV_color_solid_cone_chro ma_gray.png

13  Center region (white) has equal intensities of fully saturated red, green and blue  Primary colour regions have only one fully saturated colour– has a value of 85  Similar for other regions  Secondary colour regions have two fully saturated colours – has a value of 170 (85 x 2)  Similar for other regions  Therefore center has three – (85 x 3 = 255)  Black regions have none – C) Intensity