.SHH File Extension
Adobe Photoshop Shadow/Highlight Settings file
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What is an SHH file?
Settings file used by Adobe Photoshop, an image-editing program; stores the amount, tonal width, and radius values from 0 to 100% for shadows and highlights; also stores adjustment values for color correction, midtone contrast, and black and white clip; used for saving and loading the preset values.
The Photoshop Shadows/Highlights window can be opened by selecting Image → Adjustments → Shadows/Highlights.... SHH files can be saved and loaded from this window.