Lighting estimates need visual review.
Accuracy and Photoshop workflow
Use a background scene and a subject exported with transparency. Auto estimates exposure, contrast, color, direction, and shadow settings. It compares separate bright regions and reduces directional lighting when several sources are plausible. Confirm the direction: a bright patch may be sky or a reflection.
Lighting is a 2D approximation. Existing sunlight, complex surface shading, and clipped highlights may require retouching. Shadows assume an upright subject on a flat ground plane. Ground perspective controls foreshortening.
To continue in Photoshop for iPad, export the matched subject and shadow separately, then place both above the original scene. Both PNGs use the scene canvas size; align their edges with the scene. The shadow goes below the subject.
Images stay in this browser. Imports are limited to 40 MB and resized to at most 6 megapixels and 4096 pixels per edge to control iPad memory use. Exports are 8-bit sRGB PNG. PSD, HDR, HEIC, and 16-bit workflows are not supported here.
