Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
OBSOLETE: This policy is obsolete and doesn't work after Microsoft Edge 121. The enhance images feature is deprecated and starting in 122 this policy will be removed. Set whether Microsoft Edge can automatically enhance images to show you sharper images with better color, lighting, and contrast. If you enable this policy or don't configure the policy, Microsoft Edge will automatically enhance images on specific web applications. If you disable this policy, Microsoft Edge will not enhance images.