Dreamweaver provides basic image-editing features that let you modify images without having to use an external image-editing application such as Fireworks. The Dreamweaver image-editing tools are designed to let you easily work with content designers responsible for creating image files for use on your website.
When you resize an image in Dreamweaver, you can resample it to accommodate its new dimensions. When a bitmap object is resampled, pixels are added to or removed from the image to make it larger or smaller. Resampling an image to a higher resolution typically causes little loss of quality. Resampling to a lower resolution, however, always causes data loss and usually a drop in quality.