  In the realm of image composition, generating realistic shadow for the
inserted foreground remains a formidable challenge. Previous works have
developed image-to-image translation models which are trained on paired
training data. However, they are struggling to generate shadows with accurate
shapes and intensities, hindered by data scarcity and inherent task complexity.
In this paper, we resort to foundation model with rich prior knowledge of
natural shadow images. Specifically, we first adapt ControlNet to our task and
then propose intensity modulation modules to improve the shadow intensity.
Moreover, we extend the small-scale DESOBA dataset to DESOBAv2 using a novel
data acquisition pipeline. Experimental results on both DESOBA and DESOBAv2
datasets as well as real composite images demonstrate the superior capability
of our model for shadow generation task. The dataset, code, and model are
released at https://github.com/bcmi/Object-Shadow-Generation-Dataset-DESOBAv2.
