lesson 5 resolution

Digital GraphicsImage Capture

Learning Aims: • All of you will be able to discuss image

resolution and image capture

• Most of you will be able to research and make references to image resolution and image capture examples

• Some of you will be able to criticise image resolution and image capture devices.

How could you get photographic images into your graphics?

Ways to gather images for your digital graphics:

• Scanners

• Digital Cameras

• Creative Commons images from the internet

(licenced/public domain)

• Royalty free images

How would use the following for image capture?

• Scanner

• Digital Cameras

• Image resolution refers to the amount of pixels in an image.

• Resolution is measured by the width and height of the image as well as the total number of pixels in the image.

• For example, an image that is 2048 pixels wide and 1536 pixels high (2048X1536) contains (multiply) 3,145,728 pixels (or 3.1 Megapixels).

• 2048X1536= 3,145,728 pixels or 3.1 Megapixels

• What would happen to the image if you increased the camera to 5mp?

Image resolution

Pixels per inch • This relates to the density of pixels

per inch of digital screens

• Screens usually work at 72 dpi

• High quality photographs use 300 dpi

• When making an image resolution larger you would need to increase the dpi otherwise it would look pixelated.

Work out the maths question (using a calculator if you need to)

What size camera would you need to capture a 8X10 picture at 300 dpi?

7.2 Megapixel cameraA 8X10 picture at 300 dpi would break down into:

• 8 x 300= 2400

• 10 x 300= 3000

• 2400 X 3000= 72,000,000 pixels or 7.2 megapixels

How is image quality affected by image resolution?

Intensity

• Image quality is affected by pixel intensity

• The higher the pixels the better quality image

• This also makes the image much larger in size, this would impact on how easily you could view your image on a screen.

• The image may need to be compressed to make it more manageable.

In Pairs discuss ways to store and organise your images and share with the class.

TASK: Write your article “What is digital graphics technology?”Research and explain using examples:

• Vector Graphics

• Raster Graphics

• Types of image• Greyscale• YUV• RGB• HSV• Image resolution• Pixels• Pixel Intensity• Dots per inch• Image capture

Learning Aims: • All of you will be able to discuss image

resolution and image capture

• Most of you will be able to research and make references to image resolution and image capture examples

• Some of you will be able to criticise image resolution and image capture devices.