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COMPUTER GRAPHICS

GIMP. COMPUTER GRAPHICS. Computer Graphics are graphics created using a computer and more generally, the representation and manipulation of image data by a computer.

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COMPUTER GRAPHICS

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  1. GIMP COMPUTER GRAPHICS

  2. Computer Graphics are graphics created using a computer and more generally, the representation and manipulation of image data by a computer. Developments in computer graphics have had a profound impact on many types of media and have revolutionized the animation and video game industry. COMPUTER GRAPHICS

  3. This is an introductory course in Computer Graphics using the open source package GIMP. Participants should have successfully completed the Computer Literacy course of be fairly comfortable with the basics of file manipulation, input and output and the use of applications. • In this course, you will learn the basics of color composition in different color models, compression techniques and their uses. As with any computer course some tips in file manipulation would do well especially in GIMP in which at times there are so many save options. • You will master the techniques of working with canvases, image modes and colour selection, selections and masks, layers and blend modes, as well as adding and working with text, painting tools and retouching tools. The Course

  4. GIMP is an image editing software. • It allows you to transform scanned photographs, slides and original artwork in many ways, for example by cropping, rotation, resizing and by creating special effects using filters ranging in effect from blurring to mosaics. • GIMP combines a full range of painting, editing and image composition tools, sophisticated selection tools, and methods for adjusting levels of grey and colour in continuous-tone images. GIMP

  5. Computer: GX 280 Dell computers • Pentium IV 504 MB RAM 2.80 GHz • Hard disk Capacity: 40GB • Operating System: Windows XP • Service Pack 3 • Printers: • Brother MFC 9600 – B/W w scanner • Lexmark X1270 – Colour printer w scanner • Cameras • Eye • Logitech Quick Cam COMPUTER AND PERIPHERALS

  6. The Mouse is an integral part of GIMP and to make the most of the package, users must be confident in their mouse use. • Mouse operations include: • Pointing – the mouse is placed over a part of an image. This is normally a prerequisite for dragging or selecting • Selecting – after pointing, the mouse is clicked or double-clicked to select a particular menu instruction, toolbar, or part of an image. • Dragging – after pointing, the mouse button is held down while the mouse is dragged across part of the image. MOUSE

  7. Start All Programs GIMP Launch gIMP Follow along as we explore the interface…

  8. Menu bar Toolbox Layers, channels and paths Canvas

  9. File, • Edit, • Image, • Layer, • Select, • Filter, • View, • Window • Help. Menu Bar OPTIONS Explore the menus below each to familiarize yourself!!

  10. You may notice that some menu commands are followed by ellipses (...). This indicates a command that is followed by a dialog box where you can enter additional settings. • Some menu commands are followed by a right pointing arrow. This indicates a submenu of related commands. As you explore each menu, be sure to take a look at the submenus as well. • You'll also notice that many commands are followed by keyboard shortcuts. Gradually, you'll want to get to know these keyboard shortcuts as they can be incredible time savers. Menu bar

  11. OPEN THE FILE “BLOWHOLE.JPG”

  12. Use the menus as shown above to examine the image properties You will notice that this image is 640 x 480 pixels Its file size is 81.4 KB It is a JPEG image Google JPEG and learn about this compression technique IMAGE > IMAGE PROPERTIES…

  13. IMAGE PROPERTIES

  14. How much compression does JPEG allow before perceptible loss in image quality? • What is JPEG an acronym for? • What other compression techniques are there? • What is the more commonly used technique these days? SOME QUESTIONS

  15. DOCKABLE DIALOGS

  16. The toolbox is located in the left hand side of the GIMP interface • Hover over each tool in turn to get to know its name and have an idea of what it does… • There are SELECTION TOOLS, PAINT TOOLS, TRANSFORM TOOLS and COLOR tools. • The Tools menu option has these categorised for your convenience TOOLBOX

  17. File > Open In My Pictures, create a new folder called “GIMP” You will store all your photos in this folder. You should walk with a small flash drive so that you can back up all your work from week to week. FILE STORAGE

  18. File Formats

  19. RAW The RAW file format is digital photography's equivalent of a negative in film photography: it contains untouched, "raw" pixel information straight from the digital camera's sensor.  The RAW file format has yet to undergo demosaicing, and so it contains just one red, green, or blue value at each pixel location.  Digital cameras normally "develop" this RAW file by converting it into a full color JPEG or TIFF image file, and then store the converted file in your memory card.  Digital cameras have to make several interpretive decisions when they develop a RAW file, and so the RAW file format offers you more control over how the final JPEG or TIFF image is generated. 

  20. COLOUR MODELS

  21. CMYK COLOUR MODEL

  22. RGB COLOUR MODEL

  23. http://www.cambridgeincolour.com/tutorials/camera-sensors.htmhttp://www.cambridgeincolour.com/tutorials/camera-sensors.htm http://www.digicamhelp.com/camera-features/advanced-settings/raw/ QUESTIONS

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