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The man in that video says right at the beginning that there are exceptions. In many cases it is desirable to reduce contrast by raising the black point and lowering the white point.... you should not reduce contrast via black/white point; see this vid for more info.I had no idea on the possibilities with black point and the responding saturation points.
Yes obviously, I did use a single point sample. An average cannot show the lowest level unless all samples are identical. I have no idea why your black level results measure higher than mine. Actually, your # 2 is very close to mine. The black handles are really the only useful references since we know for sure that these are black with a minimum of shine. Not the shadow under the radiator in a bright room. Even if the shadow was the darkest spot in the room, and the black point was raised, the handles would be grey at that point. They are not.I think you're mistaken. Here are my measurements, using point samples (which means the RGB values of individual pixels, not an average of at least 9 pixels (3x3 sample).The lowest black on that handle is 14-15-15. This is not an unusual value for a black object.
As you can see, most of the pixels range from 20 to 33 levels above pure black.
Also check the shadow underneath the radiator:What evidence can you provide have to support your position that the black point is raised?
All of these are in the 70's (this is a 3x3 sample), far above what I would expect for the deepest shadows under an object like that.
I take all of these measurements as evidence that black point was raised. You're free to disagree, and I believe the world will continue turning round and round. :-D I'm just trying to help the OP achieve her goal, but it looks like she's lost interest in the thread.
Cheers, and thanks for your comments!






That isn't correct. Altering contrast via black point will alter saturation. But it isn't true that anything that alters contrast will also alter saturation. Here's an example.Anything that raises or lowers contrast raises or lowers saturation respectively

