Definitely. I just right click on the picture and "save as" to my EQ file that I called "monthly library". That's where I download the monthly libraries EQ provides in their newsletters as well. I mostly save as "jpeg".
After you save them, you have to "import" them into your libraries folder in your EQ program, copy and paste them into the "my libraries" folder and then "save" them to that folder. Once that is done, you just add them to your sketchbook as needed.
The only time I scan fabric is when its a large print fabric and the scale doesn't translate from the web pictures accurately.