GRAPHIC DESIGN

TOPIC – RASTER IMAGE SCALING ACTIVITY

NOTE & DEMO

RASTER IMAGE SCALING

Raster images are simply grids of pixels. Resizing an image can give unexpected results. And certainly, greatly enlarging an image will lead to pixelization – the appearance of squares in your image.

Also, when dealing with minor scale changes, you can also get some strange results.

Consider an image that has many lines that are 1 pixel wide. If this image is then reduced by half its size, should the lines remain or be remove?

Consider an image that contains a chess board. Each square is exactly 10 by 10 pixels. Now the image is reduced to 33% of its size. The squares cannot be 3.3 pixels by 3.3 pixels. What do you do?

ACTIVITY

Consider the following enlarged image that is 8 by 8:

a) Enlarge the image so that it is 16 by 16 by filling the grid below with the proper colours.

b) Enlarge the image so that it is 12 by 12 by filling the grid below with the proper colours.

c) Scale the image so that it is 8 by 6 by filling the grid below with the proper colours.

d) Scale the image so that it is 4 by 4 by filling the grid below with the proper colours.