Adobe's Lightroom, known as Lightroom Classic to distinguish it from the cloud-based Lightroom CC, is one of the best image editing programs to be found. Undoubtedly, Lightroom Classic (Not Lightroom CC) is the best image management software by far with no rival to its combined functionality.
Despite this, there is no easy way to find all black and white images in Lightroom Classic, the closest method is to use Smart Collections.
Collections are one of Lightroom Classic's best ways to organise images, Smart Collections automatically find and add images based on criteria you set.
Here I'm going to create a Smart Collection for images that have been marked as Black and White in Lightroom Classic, so all of the images that I have converted to black and white using the program.
Here's how:
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In the left hand side panel, scroll down to Collections
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Click on the + to the right
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In the context menu choose Create Smart Collection...

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Next, name your Smart Collection
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Choose whether or not to nest the new Smart Collection inside a Collection Set or not
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Then choose your options, here I have done the following:
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Match any of the following rules - I will only have one rule here but you could add several
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Click on Rating to bring up a sub-menu, here I have gone to Develop > Treatment
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This creates the rule, then you can choose to make more if so desired
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Check that your rule is what you want, add another if necessary
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Click Create
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That's it, your Smart Collection will now be created and any images in your Lightroom database that match the criteria set will be added to it
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Here we can see that my black and white images number 694, this is not the true number of such images in my catalog it is only a collection of those that have been converted or marked as a black and white in Adobe Lightroom itself.

Black and white images from other programs or scans for instance, will not appear in this Smart Collection unless they were marked as Black & White in the Treatment section of the Basic Panel in the right hand side panel.

So now I can find my black and white images, most of them at least, like this one of crashing waves on Ireland's Wild Atlantic Way in Dingle, Ireland.
