To use the eyedropper tool to match colors from a specific area on an image in PowerPoint, follow these steps:

1. Open your PowerPoint presentation.
2. Select the image to change the color in.
3. Select the eyedropper tool.
4. In the image select the area whose color you want to use in the color matching.
5. The selected area color will appear in the Color swatch.
6. Select other objects to apply the same color.