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There is a zoomable version available on the Google Art Project, but it’s quite dark, as is the one on the Dulwich site. Presumably they’re the same.
I’ve never seen the original, so it’s difficult to judge the true nature of the darkness and color of the image. I’ve found that museums tend to display images that are much darker in comparison to the original. This may be deliberate, I don’t know.
Although the image is credited to Google Art Project, it has been brightened along the way. This usually results in overbright, unrealistic images, but in this case — if someone altered this, they knew wht they were doing.