AI Image Lab already lets you attach reference images to guide generation. Image markers take that further: draw coloured blocks, add text labels, trace lines, or paint masks directly onto a reference image so the model knows exactly what to change and where.
You upload a photograph and write "replace the car with a sports car". The AI picks a car at random, or replaces the wrong one, or transforms the entire scene. Text alone cannot point at a specific region of an image.
Image markers solve this by letting you annotate the reference image before generation. Each marker acts as a spatial anchor that connects a region of the image to part of your prompt.
Upload a reference image in AI Image Lab and click the edit button to open the marker editor. Five tools are available:
Each marker has adjustable colour, opacity, and size via the inspector panel. Use different colours for different instructions so the model knows which prompt fragment applies to which area.
Because the model receives the annotated image alongside your text prompt, it understands spatial intent. "Replace the red block" is unambiguous when there is a visible red rectangle sitting on the bonnet of one specific car. "Remove the car from blue block" targets exactly the region highlighted in blue.
This works across all models that support reference images. No special syntax, no coordinate systems, no external masking tools. Draw on the image, describe what you want, and generate.
Start your free trial . No credit card required. Open AI Image Lab, upload a reference image, and click the edit button to start placing markers.