Page 255 - Ai Book - 10

BASICS OF IMAGE

In general,the term ‘image’ can be created or stored in electronic form which can be described in terms of
graycale or RGB image.
Grayscale Image

Grayscale image is the one in which the colour of each pixel has a range of
shades of gray without apparent colour. The darkest possible shade is black,
which is the total absence of colour or zero value of pixel. In grayscale images,
the shades range starts with 0 and ends with 255, i.e., it starts with pure black
and ends with pure white.
A grayscale has each pixel of size 1 byte having a single plane of 2d array of
pixels.

RGB Image
The RGB stands for 3 primary colorus, i.e., ‘red’, ‘green’, ‘blue’. All the coloured images
around us are made up of these three colours with varying intensity. Every coloured
image when split is stored in the form of three different channels, i.e., R Channel,
G Channel, and B Channel. Each channel has a pixel value varying from 0-255. For
example, RGB value of Aqua colour is (0,100, 100).

Pop Quiz Quiz
Pop
Name the following.

a. A computer vision related task that involves identifying objects in digital
photographs. _____________________

b. A computer vision related task that requires prediction of object instances and their pre-pixel
segmentation marks. _____________________

Ice Break
Ice Breaker Activityer Activity
RGB channel
Vist the online link https://www.w3schools.com/colors/colors_rgb.asp. On the basis of this
online tool, try and answer all the below mentioned questions.
1. What is the output colour when you put R=G=B=255 ?

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2. What is the output colour when you put R=G=B=0
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3. How does the colour vary when you put either of the three as 0 and then keep on varying the other
two?

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4. How does the output colour change when all the three colours are varied in same proportion?
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5. What is the RGB value of your favourite colour from the colour palette?
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