Scaling inserted graphics proportionally

The Insert Jpg, Insert Gif, Insert Png, and Insert image objects all give you the ability to scale the image to fit the object’s bounding box. However, this can lead to images which are out of proportion to the original image as Generator will stretch the image to completely fill the bounding box.

If you need to be able to scale images while maintaining their proportion, then you have to use the Insert Image object (or gif, jpg, png) in conjunction with the table object.

See this technote for a complete description of the process :

Scaling inserted graphics proportionally