You can select the quality of images displayed on page (Edit > Preferences > Images: Images quality).
Available choices are:
•High
Displays the original image. This may be slow over slow connection.
Note: for PDF and EPS files, the preview is displayed also when selecting High quality, as Fred cannot render the original PDF and EPS files.
•Medium
Displays the image "preview" version.
•Low
Displays the image "thumbnail" version.
Note
In versions prior to 1.6 you need to close and reopen page(s) to see the quality changes. In versions 1.6 or newer, you need to refresh the page to see the changes.
See also
Exporting Content from Database and Importing it (to get to know the current preview size in pixels)
Adjust wire images thumbnails or preview resolution (to increase the preview size in pixels)
Importing PDF (to increase the preview size only for PDF files)