Question Writer Manual/Quiz Options/Appearance Settings/Jpeg Image Quality
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Quiz authors using the Professional version can use this option to adjust the quality of any jpg images used. Set the size/image quality balance to suit your own quizzes. If your quiz is designed for use on a CDROM - you won't mind having a large file size and usually you'll want to have high quality images. If the quiz is to be available over the internet you'll often want a smaller file size to minimize quiz download times and so might choose to have a lower quality image.