Image Descriptions for Education: Making Charts, Art, and Museum Photos Accessible

An instructor emails a slide deck with a complex diagram and the alt text says "chart." A museum posts a painting photo and the only description is the title. For a screen-reader user, both images are invisible. Writing a description of what an image actually shows is a skill — and the image description tool produces a strong first draft in seconds.

The Description Workflow for Educators

Step 1: run the image through the image description tool to get a baseline draft — it reads the visual and lists the elements it detects. Step 2: edit it for teaching context. A chart description should name the axes, the trend, and the takeaway, not just "a line graph." An artwork description should include what's depicted, where, and any text in the image. Step 3: run the draft through the text polish tool to make the language simple and concrete — descriptions are read aloud, so short sentences win. Step 4: if you're generating the visual itself, like an illustration for a worksheet, use the AI image generator and describe it in the same voice you just practiced.

The Mistake That Breaks Accessibility

The common mistake: describing what the image shows instead of what it means. For a screen-reader user, "a blue circle overlapping a red square" is data with no point. The counter-intuitive part: the description's job is to carry the information the image holds, which sometimes means it looks nothing like "alt text" — it's a sentence or two that teaches the concept. Accessibility goes beyond just adding alt tags, which we covered in our guide to accessibility beyond alt text.

Images in education are information, not decoration. Generate a draft, sharpen it for the lesson, and the same image finally teaches the student who can't see it.