A white sheet of paper as a background under the coins would help. At best some are red/brown, IMO, Jim
if a copper coin has retained about 90% of its original orange-red color it will be designated as "Red" A common measurement for the next category is that between 10% and 90% (but less than 90%) of the original orange-red color remains. This is termed as a "red brown" coin. for the 3rd, When 10% of the surface or less has lost its original as minted color, and the surface of the coin is almost entirely a brown color, this is considered a "brown" coin. I'd say 4 of them are "Brown" and 6 are red/brown, none are red for sure but I might be off on 4 of them being brown, due to their position and that lighting. 79D and 73D being the best of the red/brown, and 70S, 75D, 76D, 77D being the ones I think may be too far to brown. the 70S I'm pretty sure of. the others might be lighting. When you put all of them in the same pictures like that, the light hits them all differently because they aren't in the same position and location from the light. the vast majority of circulation finds are going to be brown or red/brown, almost never red unless recently minted or saved away and then you lucked into it when it got released before it's had much time to circulate. Red is a hard bar to pass.
Your cent needs to approach this color and uniformity before it would be considered fully red. In this photo the darker areas are where less light is hitting the coin, so the red color is not as apparent. Here is an animation that shows how the lighting affects the apparent redness.
It would be multiple opinions. One of each, RB and R, would have gotten you the best answers. Try it, you'll like it. Good luck.
Why would you even want to know? If you are trying to use color for grading, use @John Burgess post above.
Wow...that's a beautiful coin! Too bad, it had a small scratch under the "I" in, in. But I have seen a coin like this graded at MS 69. As you know the trick is finding the coin with full steps with zero scratches. Great coin!
You can! Just right-click copy on the image and save to your desktop. Then download the file to a thumb drive and take it to Costco and have it printed to the size you want!