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
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
The GIMP
• The GIMP is F/OSS for creating and editing bitmap images.
• www.gimp.org/downloads/
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
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 colorSelectLassoMove
Paint fillGradient fill
Colour pickerRotateTextPen
Foreground color Background color
Tool options
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 http://creativecommons.org/licenses/by-sa/3.0/.
• 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.