Graphics Mr Arthur
Graphics
Mr Arthur
Aims of the Lesson
To cover the following Graphical concepts Graphical Tools Manipulation of images
Features of Graphics Packages Change line thickness
Scale Graphic Alter the size of the graphic
Rotate Graphic Turn it around
Crop Reduces its size by cutting
parts from the edges
Common Tools
Shapes – Circles, Rectangle, Polygon Free hand drawing – Pencil, Brush Fill Eraser Zoom Spray paint Straight Line Curve Line
Aims of the Lesson 2
To cover the following Graphical concepts Resolution Graphics Calculations
Pixels Graphics are made up of tiny dots
called pixels. The quality of the picture is
determined by the number of pixels per inch. This is called the Resolution
The more pixels there are per inch the clearer the image is
LOW RESOLUTION
HIGH RESOLUTION
Calculating Storage Requirements
The image below has 16 pixel across and 16 pixels
down. Calculate the memory requirements to the
nearest Kb 16 X 16 256 bits / 8 32 kilobytes
Calculating Storage Requirements
The image below has 500 pixels across and 300 pixels down. Calculate the memory requirements to the nearest Kb
500 X 300 150,000 bits / 8 18,750 bytes / 1024 18.31 kilobytes
Calculating Storage Requirements
The image below is 2 inches across x 2 inches down. The resolution is 400 d.p.i. (dots per inch) Calculate the memory requirements
800 X 800 640,000 bits / 8 80,000 bytes / 1024 78.125 kilobytes
2 inches X 400 = 800 dots2
inch
es X
400 =
800
dots
Storage Requirements of Pictures
The image is stored as a black and white bit-mapped graphic, measuring 4 inches by 4 inches with a Resolution of 300dpi
Calculate the storage requirements in Kilobytes
(4 X 300) = 1200
(4 X 300) = 1200
1200 X 1200 = 1,440,000 bits
1,440,000 bits
8 = 180,000 bytes
180,000bytes
1024 = 175.8 Kilobytes
Revising Graphics
1. Give 3 tools that I have used to create the following drawing
Revising Graphics
2. What has happened to this image?
Revising Graphics
3. What has happened to this image?
Revising Graphics
4. What has happened to this image?
Revising Graphics
5. What has happened to this image?
Revising Graphics
6. What is a pixel?
7. What is resolution?
8. What is the measurement of resolution?
Storage Requirements of Pictures
9. The image below is stored as a black and white bit-mapped graphic, 800 pixels across by 400 pixels down. Calculate the storage requirements in Kilobytes
800 X 400 = 320,000 bits 320,000/8 40,000 bytes 40,000 / 1024 = 39.06 Kilobytes
Storage Requirements of Pictures
9. The image is stored as a black and white bit-mapped graphic, measuring 2 inches by 3 inches with a Resolution of 500dpi
Calculate the storage requirements in Kilobytes (2 X 500) = 1000 (3 X 500) = 1500 1000 X 1500 = 1,500,000 bits 1,500,000
8 = 187500 bytes
187500
1024 = 183.1Kb
Storage Requirements of Pictures
10. The image is stored as a black and white bit-mapped graphic, measuring 3 inches by 4 inches with a Resolution of 200dpi
Calculate the storage requirements in Kilobytes (3 X 200) = 600 (4 X 200) = 800 600 X 800 = 480,000 bits 480,000
8 = 60,000 bytes
60,000
1024 = 58.59Kb
Revising Graphics
11. How many faces do you see?
Revising Graphics
12. Are these circle spinning?
Revising Graphics