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Digital Graphics

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:ScannersDigital CamerasCreative 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?

IntensityImage 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 GraphicsRaster GraphicsTypes of imageGreyscaleYUVRGBHSVImage resolutionPixelsPixel IntensityDots per inchImage capture

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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.