Aufgaben



Tasks

1) Vector graphics and pixel graphics

In most word processing programs (Word, writer), you can

also create simple vector graphics.

An example is on the right.

a) The ball is behind the fence . Try to

get it in front of the fence! (Tip: Right Mouse Button)

b) Open the file zaun.bmp with the program Gimp ! (Right Click on the File/Open with.../Gimp) now try to free the ball here, too!

c) The file fence.bmp is a pixel graphic .

What differences do you see for vector graphics?

The objects with which the vector graphics and objects with which the pixel graphics?

2) File formats for photos and graphics,

For graphics to store images, there are numerous file formats. You shall now try to find out what are the advantages and disadvantages of different formats, and whether they are particularly suitable for graphics or images are:

a) Open the BMP file grafik original.bmp with the pre-installed "Preview" and save it in JPG in PNG and GIF format!

You do this by pressing the key combination Ctrl+S for Save. Then you select the appropriate file format in the dialog box that appears. Now change the name of the file, so that you can distinguish the different variations and save.

b) Now you have the file in four different versions. Open this by double-clicking the View, resize them, and compare them according to the following criteria:

File size, variety of colors, line sharpness

c) Now do this with the JPG file foto original.jpg as well! Save it in BMP , PNG and GIF and note the differences.

3) Open the file original foto.jpg in Preview. Use the function "Change size" (Ctrl+R).

Note: preview shows you the image at a resolution of 72dpi and now you can change the size. The resolution is always the screen resolution of 72dpi.

a) What are the width and height of the image?

b) Now change the size to 1920x1080 pixels and 640x480 pixels and save in a new file!

c) Open the different variations and attempt to identify differences. What can be the problem when between some resolutions for equal representation (not zoom) no difference is observed.

4) Summary

Now write your findings in the table below and add your knowledge by going to the Internet research:

| File Format |BMP |GIF |PNG |JPG/ |

| | | | |JPEG |

|File Extension |.Bmp |.Gif |.Png |.Jpg |

|Wikipedia entry |Windows Bitmap |Graphics Interchange Format|Portable Network Graphics |JPEG File Interchange Format |

|Special Features | | | | |

|Restrictions, | | | | |

|disadvantages | | | | |

|Number of colors | | | | |

|The file size | | | | |

|(large, medium, small) | | | | |

|Suitable for | | | | |

|graphic or photo? | | | | |

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