NOTE: It is preferred that you resize and resample an image in an external image editor (Photoshop, Irfanview, Gimpshop, etc.) BEFORE placing your image on a page. Otherwise, you may experience slow load times or distorted imagery on your published pages.
You can change the height and width of any image from within Seamonkey by double-clicking the image.
In the Image Properties window, click on the 'Dimensions' tab and click Custom Size.
Enter the height and width you would like to use and click on the OK button.
The Constrain option lets you resize your images proportionally.
The 'Appearance' tab allows you to adjust the spacing around the image and how text is handled around the image.