McDonalds photographs burgers with Vaseline on the patties to make them look jucier.
Breyers shoots mashed potatoes instead of ice cream to make it look more appealing.
Every marketing image you've ever seen has been altered way more than this.
A couple of articles that go a bit more into the 'magic' of food photography:
And of course McD's own marketing video with a backstage look at the Quarter Pounder w/ Cheese photoshoot, though they don't show extra polishing ingredients:
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