Pixel Based
Pixel based Logos, also know as raster based images or bit-mapped images (if anyone asks!) are comprised of pixels in a grid. They store image data as a map of individual pixels. The data has a fixed resolution and can not be enlarged without sacrificing image quality. Pixel files usually feature the file extensions .jpg (most common), .gif, .tiff and .psd.

Pixel files are less predictable. A high resolution file does not mean high quality reproduction in colour matching or definition. Pixel logo files are much trickier to work with than Vector because Pixel files do not scale or hold quality like Vector files do.

So why do we need a Pixel based logo at all? Well, many office software products utilise Pixel based images to import a logo (i.e.: your Website, PowerPoint, Word etc.) and cannot use a Vector based logo.