How to Use the ChatGPT Image 2.5 Sketch Feature with a Reusable Canvas Workflow

ChatGPT Image 2.5’s sketch feature is presented as a visual annotation workflow for localized image editing, allowing users to draw vector strokes, outlines, masks, and directional shapes on an image and pair them with scoped prompts to reduce unwanted changes to surrounding content. It distinguishes sketch controls, which provide geometric guidance for layout changes and object placement, from comment pins for precise text or color adjustments and selection masks for bounded replacement or removal. Users can access the canvas through markup controls, a pencil icon, or the @sketch shortcut across web, desktop, and mobile platforms, then follow a process of preserving a master image, marking the target area, writing explicit instructions that name both requested changes and protected elements, and inspecting results for visual drift. Examples include turning architectural blueprints into interior renders, inserting products into commercial photographs, and altering fashion silhouettes while maintaining lighting, perspective, and textures. The guidance also notes that annotations are not hard pixel locks, so thick or highly saturated strokes, excessive markings, and arrows can cause artifacts or unintended edits; recommended recovery methods include reducing stroke opacity and thickness, reverting to the original master image, strengthening preservation instructions, or switching to comment pins or selection masks for simpler localized changes.

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