.HDT File Extension
Photoshop HDR Toning Preset File
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What is an HDT file?
Settings file created by Photoshop professional CS5 or later image editing software; saves settings for adjusting an HDR (High Dynamic Range) photo; includes color, tone, and other settings.
Several HDR Toning presets are included with the Photoshop installation and are stored in the Presets/HDR Toning/ directory. You can also create custom presets and save them through the HDR Toning window.