Hi Robin, thank you for your reply.
I think we are not talking about the same issue ( my fault) i´ll try to explain it better.
I have 2 images, image A with blurred parts and image B without blurred parts. I need to show image A in the shop thumbnails but when a customer buys it, he will get the image B.
Its similar to the symbiostock watermark. The thumbnails have the watermark but the downloaded image don´t.
I´ll make the blurried parts manually for each image.
Thank you so much and sorry to bother you again.