From bitmap data to vector data and back

It is sometimes necessary to convert images from bitmap data to vector data or back. Some possible uses include:

• If you scan or photograph a logo, it is a bitmap image but if it is going to be used often in a layout if would be more practical to have that logo as a vector drawing so its file size is smaller and you can change the size without worrying about any loss in quality.
• Vector drawings often have to be converted to bitmaps if they will be used on a web page.
• Vector drawings are sometimes too complicated for a RIP to be output on film or plate. Converting them to a bitmap simplifies the file.

Luckily it is fairly easy to convert images from one mode to the other:

• From bitmap data to vector graphics: the process to convert a bitmap image to vector data is called outlining. Some drawing applications such as Adobe Illustrator and Corel Draw have this option built in. There are also separate programs available that can do the same thing.
• From vector graphics to bitmap data
  • Many drawing applications can store vector data as bitmap files as well (usually this option is hidden in the Export menu option).
  • You can always view a vector file on screen, then take a screen capture and save this screen capture as a bitmap image.
  • Photoshop can open some vector file formats and rasterize the file so that it becomes a bitmap file. A pop-up menu allows you to define the resolution and color mode of the bitmap data.

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