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Two options

Bitmaps or Vectors

Building blocks: Pixel

• Pi cture Element(Scanners, cameras,Monitors, printers)

• Image made with pixels: Bitmap

6x6 pixels

250 x 250 pixels

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Resolution• Bitmap images become ugly when enlarged too much

• Resolution is the number of pixels covering a surface.Example: 300 pixels per inch

• ppi / dpi

• Screen: ± 80 ppi, Perfect print: 300 ppi, OK print: 200 ppi

Resolution and size

Image size Megapixels File size (Mb)

A4 200 ppi 3,9 12

A4 300 ppi 8,7 26

A3 200 ppi 7,7 23

A3 300 ppi 17,4 52

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Compression• Reduces an image’s file size• Lossless Lossy

• No loss in quality Loss in quality• Slight reduction file size Strong reduction file size• PNG, Tiff, JPEG

Vector based images

Images are not formed by pixels, but bymathematical descriptions of lines

=> Line drawings, technical illustrations, butalso southpark

x + y 2 2

x + y 2 2

x + y 2 2

x + y 2 2

x + y 2 2

x + y 2

x + y2 2

x + y 2

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Vectors and bitmaps• Vectors can be enlarged without loss of

quality

• It is easy to convert vectors to bitmaps• The inverse is a lot harder (Tracing)

enlarged vector enlarged bitmap

Digital Colour

Colour correction

PrintingMonitors, camera’s,scanners, internet

Mixing ink: SubtractiveMixing light: Additive

CMYKCyan Magenta Yellow blacK

RGBRed Green Blue

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Examples of RGBR 255 G 0 B 0

R 255 G 255 B 0

R 255 G 150 B 0

R 150 G 150 B150

What can you do with Coreldraw

• Draw!• Mix vectors and bitmaps

• Make artistic & technical illustrations• Any size you want.• Use your illustrations in print, office,

internet, etc.

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Examples

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1. Introduction to digital imaging2. Simple drawing

a. Freehand toolb. The Pick tool: Selecting, Moving, Resizing and Rotatingc. Lines and fills

3. Drawing by Buildinga. Rectanglesb. Circlesc. Shapingd. Groupinge. Working precise

4. Advanced drawinga. Bezier curvesb. The Node Edit tool

5. Working with Texta. Artistic textb. Paragraph text

6. Adding Picturesa. Importing bitmapsb. Simple editing of bitmapsc. ( Further possibilities of bitmaps in CorelDRAW )

7. Combining elementsa. Mixing Text, Vectors and Bitmapsb. Aligning elementsc. Keeping text Readable

8. Special Effectsa. Gradientsb. Transparency

9. Publishing your work a. Printingb. Office (Word, Powerpoint)c. Internet

10. Questions

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Publishing: Printing – Print – Print > Layout > Print tiled pages

(Tegelpagina’s afdrukken)

– Publish to PDF, a PDF is always the same

– If all else fails -> export to a bitmap file andprint the bitmap file, with Corel Photopaint orirfanview

To Office

– Copy -> paste special , windows metafile – Export -> Windows metafile ( WMF), of

Portable Network Graphics ( PNG )

– Use WMF for simple drawings, – Otherwise use PNG – For png, use a resolution of 300 ppi for print,

less for presentations. – Use anti aliasing (NL: ongekarteld )

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Internet• Export to

– Portable Network Graphics (PNG) – Joint Picture Expert Group (JPEG) – Use a smaller size; +- 100 ppi

Learn more• http://student.vu.nl/y.kremer

advanced effects:• http://www.unleash.com/tomknight/ • www.computerarts.co.uk• http://www.urbancowboy.net/