GIMP Threshold Tool is Cool

[xpatUSA]

I've been playing with Layer Masks lately and consequently have discovered the "joys" of making good selections. For some images, I've found this tool quite handy:



The ability to use a particular channel is quite useful. For example, in the above image I could have selected the green channel and made a mask to tone down the leaves while leaving the berries still prominent.

I have no idea what Photoshop offers in this regard, so please pardon me if this is no news to anyone here ...

[Manfred M]

Photoshop has this functionality as well.

In my work, I spend a lot of time making and refining masks. I don't use channel masks all that often, but when I do, I will pick the channel with the highest contrast to build my mask with.

[DanK]

The basic threshold tool in Photoshop is not as sophisticated: it has a single break point rather than two. However, you can subtract masks to have this effect. One can also have a bunch of different masks of this sort at the same time, which is called luminosity masking. A number of people, notably Tony Kuyper, have created Photoshop add-ons that make this much simpler and extend the functionality. One of my goals during our collective isolation is to learn to use luminosity masks well.

[xpatUSA]

One of my goals during our collective isolation is to learn to use luminosity masks well.

Me too. I'm playing with split color-toning as we speak!