Text-to-image diffusion models have achieved remarkable performance in image synthesis, while the text interface does not always provide fine-grained control over certain image factors. For instance, changing a single token in the text can have unintended effects on the image. This paper shows a simple modification of classifier-free guidance can help disentangle image factors in text-to-image models. The key idea of our method, Contrastive Guidance, is to characterize an intended factor with two prompts that differ in minimal tokens: the positive prompt describes the image to be synthesized, and the baseline prompt serves as a "baseline" that disentangles other factors. Contrastive Guidance is a general method we illustrate whose benefits in three scenarios: (1) to guide domain-specific diffusion models trained on an object class, (2) to gain continuous, rig-like controls for text-to-image generation, and (3) to improve the performance of zero-shot image editors.

通过对分类器的自由引导的简单修改，该论文展示了 Contrastive Guidance 方法可以帮助在文本到图像模型中解开图像因素，从而提供对图像因素更精细的控制。该方法的关键思想是使用两个仅在最小标记上有差异的提示对所需的因素进行描述，其中正面提示描述待合成的图像，基准提示作为“基准”以解开其他因素。这种方法在三个场景下的优势体现为：（1）指导在对象类上训练的领域特定扩散模型，（2）为文本到图像生成提供连续的、类似骨骼的控制，以及（3）提高零-shot图像编辑器的性能。

对比提示改善文本到图像扩散模型中的解缠