BTEC CREATIVE MEDIA

PRODUCTIONUNIT 13 – ASSIGNMENT 1

MR. AKITT

What do you know about digital graphics?

LEARNING OBJECTIVES• LIST A RANGE OF CONSIDERATIONS RELATING TO DIGITAL GRAPHICS

TECHNOLOGY

• DESCRIBE FEATURES OF DIGITAL GRAPHICS TECHNOLOGY WITH REFERENCE TO EXAMPLES

DIGITAL IMAGES: TWO KINDS OF IMAGE

1.Vector

2.Bitmap (Raster)

VECTOR

•Made of points, lines and curves – the image is built and displayed through mathematical expressions.

• It can be scaled (re-sized) and will not loose clarity or quality.

•Resolution-independent – can be printed at any resolution.

VECTOR CONT

Common file formats: .ai, .cdr, .ps, .pdfs

Common vector graphic programmes: Adobe illustrator, CorelDraw, FreeHand

Common uses of vector graphics: Drawing, illustrations, cartoons

BITMAP (RASTER)

•Made up of pixels.

•Resolution-dependent - it can not be scaled up without loosing quality.

BITMAP (RASTER) CONT

Common bitmap files: .jpg, .jpeg, .gif, .png, .tif, .tiff, .bmp

Common bitmap programmes: Paint, Photoshop

Common bitmap images: Photographs and Paintings.

PIXEL• The smallest part of a bitmap (raster) Image. This pixel will have a single

colour. If you zoom in far enough, or scale a bitmap image up, you can see its pixels.

OR

• The smallest controlled element of a screen. Each pixel on a screen emits Red, Green and Blue light. By changing the levels of each colour (Red, Green and Blue) your screen is able to produce every possible colour.

FACTORS WHICH IMPACT IMAGE QUALITY

• Compression: this is when you try to reduce the size of a file, perhaps to make it easier to send to someone else.

• By compressing the image you loose data, this means you loose quality.

Resolution: this is the size of a image. It is how many pixels tall, and wide, an image is.

The higher the resolution = the better the quality.

However this means the file size is larger.

Resolution only applies to bitmap images.

IMAGE CAPTURING1.Scanning an image which has been drawn. This image can not be resized

without loosing quality.

2.Digitally drawing an image in Photoshop with a sketchpad and stylus. This image can be resized, providing it is being drawn as a vector image.

3.Using a digital camera. Simply takes a photo which is saved digitally. Stored as a bitmap image, so will loose quality if re-sized.

OUTPUTHow an image will be outputted often determines the kind of image it needs to be.

Outputs: Print (Paper), Screen & Online

Print: Printing uses the CYMK Colour Pallet (Cyan, Yellow, Magenta, Black)

Screen: Use pixels to display and image, so uses the RGB Colour Pallet (Red, Green, Blue)

STORAGE

File size: the larger an image is, or the higher its resolution, the larger the file is:

• Harder to email

• Longer to download

• Takes up more space in a computers memory

STORAGE CONT

Naming conventions: It is important to save work with suitable names so you, or others, can locate them. If you are working on a large project as part of a team your files must be organised and named appropriately.

• Work 1, Image2, Background5 are not clear enough.

• Website_Banner_Background, New_Company_Logo_hidef etc are more exact, and eaiser for others to find, and understand, without having to open and look at lots of other images.

STORAGE CONT

Asset management: When working on a project, or any work, it is important to keep files organised.

• Save work, with suitable names, into correct folders

• This means others are able to use and access your work, and you are able to access theirs more efficently