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