Hit Main Image Browse button and load the main image from your device. (Right click a web page image and select 'Save as..' to save an image locally first)

2: When the image has loaded, left click and drag to measure a known width or height. Use largest known dimension for better scale accuracy.

3: Enter the actual full scale measurement you just measured into either Known Width or Known Height box and hit Set Scale button.

4: The scale has now been set, and the scale rule calibrated. You can click and drag to measure any dimension in the image.

5: For Scale Models, enter your scale in My Scale and hit Set My Scale to show both full and scale dimensions in drag box, and display a scale rule to print (100% printer scale) cut and measure actual model dimensions from the printed image.

6: Drag the slider to increase or decrease image size, auto adjusting the image scale and rule.

Click the Add Image Browse button and browse to images to add to the diagram. The image will open top left of diagram with 3 circular control buttons at its top left. Click, hold and drag the Green circle to position image. Click the Blue circle then mouse-wheel to re-size - Hold SHIFT Key for opacity and ALT Key to rotate. Click the Red circle to remove image.
When images are first entered, they are displayed at 50% opacity. This makes it easier to see images with a white background over the main image. To adjust image opacity, click the blue circle, hold down the SHIFT key and roll your mouse-wheel. Click Clear Images to remove all currently displayed images.

Check Total Areas, then click and drag to add total areas.

Enlarge image with slider and measure largest known dimension to set scale for better scale accuracy.

Check the Path checkbox and click points in the image to draw and measure a path. Hit New Path or SHIFT + N to add each path to total. For floor plans, measure total linear wall dimensions and calculate area for sheeting, tiling, paint etc.

Check Total Areas, then click and drag in diagram to add selection to total area.