Hi – is the reply to this post still the case?
Taken from: http://www.tipsandtricks-hq.com/wordpress-estore-and-nextgen-gallery-integration-create-photo-shop-1200
The images have been resized to 800×600 resolution using the NextGen Gallery resize utility. An watermark has also been applied to the image using the NextGen Gallery ‘Effect’ option to prevent stealing. Once the purchase is complete the encrypted download link for the original image (1920×1200 resolution and no watermark) is emailed to the buyer.
I didnt interpret from this that you had to store 2 versions of the image (which is going to have significant impact on hosting server space)
Or has there been a workaround?