If there was such an organization as the Histogram Police, they would be knocking on your door for this. It does things to the tones in the image that go against all the rules for tonal rendition – or at least all the rules invented by darkroom technicians.
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A ‘matte’ effect is where the darkest tones in the image don’t descend to a solid black but a mid-dark gray tone. It doesn’t have to be gray, it can be a color, but for this example let’s stick to gray.
It’s easy to do with Lightroom’s Tone Curve panel and the results it produces can have a beautiful vintage ethereal look. What’s great about it is that it’s super quick, uses just one tool (though this example dresses it up a bit with grain and a vignette), and that there’s no mystery about it.
I started with a regular color portrait which is nice already. The first step was to switch to Black and White mode in the Basic panel, the second was to open the Tone Curve panel and do just two things.
1. I dragged the black point not horizontally but vertically. This set the darkest tone in the image to a gray value, not solid white. That made the image a bit too pale.
2. So then I added a control point a little way up the curve and dragged it roughly in line with the 45-degree reference line indicating the original tone curve. That restored the contrast and brightness but kept the matte effect.
That’s all there is to creating a matte effect in Lightroom. If you work in color you can start getting clever with the individual RGB curves and that can be very effective too, but it’s a bit of a rabbit hole.
For this shot I thought a bit of grain would go well with the soft vintage look, and a bit of post crop vignetting too.