Even though Graphic Studio is powerful, you may find that using 3rd party image editing software works better for you and for your image.
Using Photoshop, Gimp or the many other software options may be just what you need. In this example, I've used Gimp to outline the rose, I can then remove the background and fine tune things using the many tools in the software.
This can be tedious, but if you are comfortable with image editing software, it might be easier to than using Graphics Studio.
Many of these programs also have tools to do the job. It's a matter of learning more software.
Not only can you remove the background, you can use these tools to make other edits and create collages of images
BUT these days there are also online services that do an amazing job of this.
Here is one I found with a simple Google search. The website is remove.bg. It's free and completely online.
Simply upload your image and Voila! the background is gone.
This is a very simple example, and the results will vary with your image, but it's worth a try.
Even if the removal isn't perfect, you can fine-tune it in another software, Graphics Studio or Stitch Designer.
Stuff you Should Know
About Double Bed Jacquard
Double Bed Jacquard (DBJ) is a technique that uses all needles on both beds AND incorporates color work on the main bed.
Utilizing slip stitch, and a color changer the knitting includes multiple colors in a row with no floats.
Thanks to fellow knitter, Ingeborg R. for inspiring this course and for sharing the photos of Emmi
Learn more about the different DBJ methods on page 365 of the DesignaKnit 9 manual: Menu >Help > Manual