Creative tasks require creators to iteratively produce, select, and discard potentially useful ideas. Now, creativity tools include generative AI features (e.g., Photoshop Generative Fill) that increase the number of alternatives creators consider through rapid experiments with prompts and random generations. Creators use tedious manual systems for organizing their prior ideas by saving file versions or hiding layers, but they lack the support they want for reusing prior alternatives in personal work or in communication with others. We present HistoryPalette, a system that supports exploration and reuse of prior designs in generative image creation and editing. Using HistoryPalette, creators and their collaborators explore a "palette" of prior design alternatives organized by spatial position, topic category, and creation time. HistoryPalette enables creators to quickly preview and reuse their prior work. In creative professional and client collaborator user studies, participants generated and edited images by exploring and reusing past design alternatives with HistoryPalette.

翻译：创造性任务要求创作者迭代地生成、选择并舍弃潜在有用的想法。如今，创意工具集成了生成式人工智能功能（例如Photoshop的生成式填充），通过提示词的快速实验与随机生成，大幅增加了创作者需考虑的备选方案数量。创作者目前依赖繁琐的手动系统（如保存文件版本或隐藏图层）来组织过往想法，但在个人工作或与他人沟通时，缺乏对复用历史备选方案的理想支持。本文提出HistoryPalette系统，用于支持生成式图像创作与编辑过程中历史设计的探索与复用。通过HistoryPalette，创作者及其协作者可依据空间位置、主题类别和创建时间组织的“调色板”探索历史设计备选方案。该系统支持创作者快速预览并复用过往作品。在针对创意专业人士与客户协作用户的研究中，参与者借助HistoryPalette通过探索与复用历史设计备选方案，完成了图像的生成与编辑任务。