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OK. If this is about monitoring for changes in exposure and color among many photos, I’m not sure there is an efficient way to do this in any Adobe photo app. There are some potential solutions in other photo apps, though.
In GraphicConverter (shareware, Mac only), there is an Export Histogram command. If you select multiple images and apply this command, you get a spreadsheet that lists all selected images and 255 columns containing the value at each level of the histogram. Although it’s just a wall of numbers when you open it in a spreadsheet app, you could try graphing those in your spreadsheet app to find breaks and other inconsistencies across images.
In XnView MP (free, Windows/Mac/Linux), there is a Compare view with a Histogram option if you still want to try that approach. But the Compare view seems to have a maximum of four images at a time.
You could continue researching various photo utility apps and Lightroom Classic plug-ins to see if any has the kind of feature you want. For example, maybe try using John Ellis’ Export LUT plug-in to export each photo’s color look-up table, and use another tool to compare them (I have no idea what app would do that easily). Some plug-in sources:
And then there’s this wacko idea…I use an application called LRTimelapse which is, as the name says, designed to make smooth time lapse sequences and it works with Lightroom Classic. Some of its most important features are about ensuring that time lapse transitions appear perfectly smooth across all frames despite changes in scene lighting or camera settings. In the picture below, I highlight some of the things that make this possible. In the data columns, it can show you values for visual luminance across frames in a folder (in the data column with the Visual Luminance header in light purple), and in the time lapse preview, it can show you a light purple line that graphs those same changes in visual luminance. If you see a sharp break in the Visual Luminance values column or its preview graph, you can apply features that smooth them out over time.
Again, this is a crazy workaround because you’d have to buy other software that is not cheap and comparing stills is really not what it’s for, but for example, you could throw some copies of sample images from different albums and use these tools to see if there are significant changes in luminance or color. The only reason I bring up LRTimelapse is that it seems unique in providing such detailed readouts and graphs of value changes across many images, for most Lightroom Classic Develop options. There are a lot more columns than are shown below.
LRTimelapse talks to Lightroom Classic using XMP metadata files, so if you were to compare frames with LRTimelapse by putting copies of images into one folder, those should be raw images with XMP metadata sidecar files included from your current Develop module edits. LRTimelapse does not directly query a Lightroom Classic catalog database.
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