Evaluating ratio meat/fat
Let's compute how lean is this piece of meat based entirely on the photograph.
Fortunately Pixcavator captures dark and light separately and the data is saved in a spreadsheet.
The amount of meat (red) is 35,350 pixels:
The amount of fat (green) is 8,931 pixels:
Conclusion: The proportion of fat to meat is about 1:4.
A more realistic scenario is analyzed here: Evaluating ratio meat/fat 2.
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