SC ICT Certification Level 1 12 Graphics By Ross Parker

Graphics Computer graphics utilise a computer’s ability to display a bitmap in order to create an image: Source: Wikimedia Commons

Bitmap vs. Vector Source: Wikimedia Commons Bitmap is the default When should we use vector?

File Types Bitmap –.tif – uncompressed (or not), pages, layers –.bmp – uncompressed –.png – compressed, lossless –.jpg – highly compressed, lossy –.gif – highly compressed, lossy, indexed –.xcf – GIMP’s format –.psd – Abode Photoshop’s format Vector –.svg – open standard –.ai – Adobe Illustrator’s format

USING THE GIMP Basic & Intermediate

The GIMP The GIMP is F/OSS for creating and editing bitmap images. Source: Wikimedia Commons

Image Size Generally rectangular Image size is expressed in pixels (px): To resize: Image > Scale Image 113 px 150 px

Crop Change size of image whilst... –Maintaining size of contents To crop: Image > Canvas Size 75 px

Layers Images can contain layers To see Layers: Windows > Layers Try the “Opacity” setting. 5-layer example

Colors RGB model represents colour as mix of: –Red –Green –Blue Each colour ranges from 0 (off) to 255 (on) HTML notation uses hexidecimal

Toolbox Select by colorSelect Lasso Move Paint fill Gradient fill Colour picker Rotate Text Pen Foreground colorBackground color Tool options

USING THE GIMP Advanced Focus (optional, not assessed)

Advanced Features Colour Curves & Balance Filters Select by colour Mask Clone Tool Healing Tool

Licensing All original work used here is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. For more details please look at This license has been chosen to permit a high degree of sharing, whilst protecting the author’s control as to how the content is used. Please respect this license and use accordingly! Recycled and borrowed works from other sources are used under appropriate licenses, which are not affected by this license. The original source is always given. All original work created by Ross Parker (Sha Tin College, English Schools Foundation, Hong Kong), except where specified.