wan/2-7-imagetext-to-imageimage-to-image12 paramsWidest aspect-ratio set of any in-scope model. color_palette items are { hex, ratio } objects, not bare hex strings, and bbox_list is one list of boxes PER input image — both are transcribed wrong easily and fail as a 422. RESOLUTION CEILING: 4K is text-to-image, standard-mode only. The input_urls half is confirmed against the live API (createTask returns code 500, "resolution is not within the range of allowed options"); the sequential half comes from this project's reference table and is not restated in the doc's current revision, which dropped the wording from the resolution field entirely. aspect_ratio is likewise read only in text-to-image — in edit mode Kie ignores it rather than rejecting it.