12_A_Image properties homework

Image Properties

Image properties affect the file size and the quality of your image. We have to consider the purpose of the image and decide which is most important, file size or image quality.

Image properties are:

RESOLUTION
PIXEL DIMENSION
COLOUR MODE
COLOUR DEPTH

Read the information for each property and use it to answer the questions.

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Image Properties

RESOLUTION aka how many pixels per inch

When making a graphic for print, we need to make sure the image is very high quality. The printer ink dots that make up the image are very fine and therefore the image can be very detailed, so we need a resolution of 300 DPI (dots per inch). Because it is more detailed, the file size will be large!

If you are on a mobile or tablet, you don't have a lot of storage space. Images with a large file size take ages to send. The screen pixels on monitors, tablets and phones are not as small as a print ink dot. It is better to use a smaller resolution. A resolution of 72 PPI (Pixels per inch) is a good balance between quality and file size for screen images.

Multiple Choice

Which resolution would you use?

DVD cover for Guardians of the galaxy V3

• 300 dpi

• 72 ppi

• 100 ppi

• 10 dp1

Multiple Choice

Which resolution would you use?

Magazine advert

• 300 dpi

• 72 ppi

• 100 ppi

• 10 dp1

Multiple Choice

Which resolution would you use?

Web banner

• 300 dpi

• 72 ppi

• 100 ppi

• 10 dp1

Multiple Choice

Which resolution would you use?

Packaging for a mobile phone

• 300 dpi

• 72 ppi

• 100 ppi

• 10 dp1

Multiple Choice

Which resolution would you use?

Thumbnail cover image for a new Netflix film

• 300 dpi

• 72 ppi

• 100 ppi

• 10 dp1

Multiple Choice

Which resolution would you use?

buttons on a mobile app or website

• 300 dpi

• 72 ppi

• 100 ppi

• 10 dp1

This refers to how big your picture is, height x width. The bigger the image, the larger the file size.

However, if the image is smaller than the final web or print version, it will get blurry. Therefore, it is important to set the image to the size of the final product.

IMAGE SIZE aka. Pixel dimensions

Multiple Select

How big is a magazine front cover? (Tip: Google it)

• 6 inches x 10 inches

• 8.5 cm x 11 cm

• 210 x 297 mm

• A4

Multiple Choice

How big is a mobile app screen? (Tip: Google it)

• 6.3 to 6.7 inches

• 8.5 cm x 11 cm

• 210 x 297 mm

• A5

Colour Mode is where you choose what type of colour mode you will use.
For example:

RGB (red green blue) is chosen for computer monitors and screens.

CMYK (cyan, magenta, yellow and black) used for printed products.

​COLOUR MODE

Multiple Choice

What colour mode needs to be used for a magazine front cover?

• RGB

• CMYK

Multiple Choice

What colour mode needs to be used for a Graphic for Instagram?

• RGB

• CMYK

Multiple Choice

What colour mode needs to be used for drinks packaging?

• RGB

• CMYK

Colour depth refers to how many colours are in each pixel.

Each pixel is stored on the computer using binary bits.

The more bits you allow the more colours you can have and your image will be represented more accurately. The more colours, the larger your file size.

(Sound familiar? it should do – you covered this on the spreadsheet task with the smiley face)

​COLOUR DEPTH

Multiple Choice

Which has a bigger file size, a 16 bit or 4 bit colour image?

• 16

• 4

Multiple Choice

Use the colour depth leaf image (slide 16), as a guide, what colour depth should we use for this image?

• 16

• 4

• 8

• 24

Multiple Choice

Use the colour depth leaf image (slide 16), as a guide, what colour depth should we use for this image?

• 16

• 4

• 8

• 32

Multiple Choice

Use the colour depth leaf image (slide 16), as a guide, what colour depth should we use for this image?

• 16

• 4

• 8

• 32

Multiple Select

Use the colour depth leaf image (slide 16), as a guide, what colour depth should we use for this image?

• 16

• 4

• 8

• 32