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Grayscale Images
Grayscale images are images made up of different shades of gray, ranging from black to white, but without any
colour or hue. It only contains brightness information, meaning they don’t have any colour data (like red, green, or
blue). Each pixel just represents a certain level of brightness or gray, so you don’t see vibrant colours, but you can
still see details in different light or dark areas of the image. The darkest shade is black, representing the complete
absence of colour with a pixel value of 0. The lightest shade is white, indicating the full presence of colour with a
pixel value of 255.
In Grayscale images, each pixel is made up of 1 byte (which is 8 bits). This byte stores the pixel’s brightness level,
with values from 0 (black) to 255 (white). A pixel’s value determines how dark or light it appears on the image.
The pixels in a grayscale image are arranged in a 2D grid (a flat array of rows and columns). The image's height
(number of rows) and width (number of columns) define the size of the image. For example, a grayscale image
with a height of 100 pixels and a width of 200 pixels would have 20,000 pixels in total.
Grayscale images are simpler to process and take up less memory compared to coloured images. This makes them
useful in situations where colour isn’t necessary, like certain types of scans, medical images, or old black-and-white
photos. The value of pixels is within the range of 0-255 for an image.
The images we see, computer stores them in the form of numbers.
RGB Images
All coloured images around us are made up of 3 primary colours of Red, Green and
Blue. All the colours are made by mixing these primary colours in varying intensity. R B
Every coloured image when split is stored in the form of 3 different channels, R
Channel, G Channel and B Channel. Each channel has a pixel value varying from
0-255. For example, if we see the turquoise colour RGB band would look like [64,
224, 208]. In a coloured image a single pixel contains red, green and blue values in G
triplets.
Task 21 st Century #Creativity
Skills
#Technology Literacy
Visit: https://www.w3schools.com/colors/colors_rgb.asp. On the basis of this online tool, try and
answer the following questions.
1. What is the output colour when you put values of R, G, B as 255 respectively?
316 Touchpad Artificial Intelligence (Ver. 3.0)-X

