Generally, X-Cart works with a product image and uses the same image scaled down for the thumbnail. As a method, it isn't effective. That is one reason there are at least a dozen major product image mods in the forum.
You most likely are using the same thumbnail and product image, the inaccurately scaling the image. I suspect that X-Cart with improve product images in the versions to come.
- Mike
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4.1.9
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