Computer graphics


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Computer graphics

  1. 1. Computer Graphics Basic Introduction
  2. 2. Bitmap / Raster Graphics (Paint) <ul><li>A bitmap (BMP) is a type of image file format. The term bitmap comes from the computer programming terminology, meaning just a map of bits , a spatially mapped array of bits. </li></ul><ul><li>Other formats, such as JPEG, TIFF and GIF also store bitmap images, but they are not usually referred to as bitmaps , since they use compressed formats. </li></ul><ul><li>JPEG is usually lossy compression. TIFF is usually either uncompressed, or losslessly compressed like GIF. </li></ul><ul><li>They are resolution dependent. They cannot scale to an arbitrary resolution without loss of apparent quality. </li></ul>
  3. 3. Vector Graphics (Draw) <ul><li>Vector graphics is the use of geometric shapes such as points, lines, curves, or polygon(s), which are all based upon mathematical equations, to represent images. </li></ul><ul><li>File types include: </li></ul>CGM SVG Encapsulated PostScript SWF PDF Windows Metafile (WMF)
  4. 4. WMF Format
  5. 5. Image Resolution Pixels per inch (ppi) – how many single dots, or points are in a square inch (150-360 ppi ideal) Megapixel – the number of pixels captured by a camera (2-14 available)
  6. 6. Where do I find graphics? <ul><li>Clipart in your programs (Word, PowerPoint, etc.) </li></ul><ul><li>Buy clipart libraries </li></ul><ul><li>MANY free sites on-line </li></ul><ul><li>Google images search </li></ul><ul><li>“ Borrow” from webpages </li></ul><ul><li>Make / upload your own. </li></ul>
  7. 7. What about copyright? <ul><li>The act of placing something on the Internet automatically copyrights it – NOT the opposite, which is often what folks think… </li></ul><ul><li>APA Style example: </li></ul><ul><ul><li>Solar Radiation and Climate Experiment. (2007). [Graph illustration the SORCE Spectral Plot May 8, 2008]. Solar Spectral Data Access from the SIM, SOLSTICE, and XPS Instruments . Retrieved from spectra.ion </li></ul></ul><ul><li>Webpage to webpage – many sites simply ask for a link to be included back to their page. </li></ul><ul><li>Pictures of people – always get permission! </li></ul>
  8. 8. Animated Graphics <ul><li> (one example) </li></ul>
  9. 9. How can I create graphics? <ul><li>Drawing, painting & word processing programs </li></ul><ul><li>Digital cameras </li></ul><ul><li>Scanning </li></ul>Hello
  10. 10. Playing Around with Photos <ul><li>Photoshop </li></ul><ul><li>Paint programs </li></ul><ul><li>Program that came with your camera </li></ul><ul><li>Picassa (free) – let’s watch info video </li></ul><ul><ul><li> </li></ul></ul>
  11. 11. Lab Assignments <ul><li>Use Paint to create a drawing and save it. Use Word to create a drawing, wordart, and a chart / graph. Insert your Paint drawing and insert a Word clipart image. Save the document and upload it to Google Groups. </li></ul><ul><li>Download the photo I have uploaded into Google Groups. Use Photoshop to crop, rotate, and alter the image in any other way you wish. Save the new image and upload it to Google Groups. </li></ul><ul><li>Find a photo of Amelia Earhart, alter it with a filter in Photoshop and upload it into Google Groups. </li></ul>