Find and Set Scale From Image to Measure Objects - Set Your Scale and Measure at Scale and 100% from Image
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Hit Main Image Browse and select an image containing a known measurement. Click and drag in the image to measure a known width or height.
Enter this actual (full scale) known width or height in the appropriate textbox and hit Set Width Scale or Set Height Scale to calculate and set the scale of the image.
Now you can directly measure scaled dimensions in the image, or print the page at 100% printer scale and cut the scale rule to measure at scale. To use an image from the web, right click the image and choose 'Save picture as...' (or similar) to save the image locally, then browse to saved image location. Hit Add Image Browse button to add, position and re-size images over main background. When this page first loads, a demo image is displayed and the scale is set. Load a new floor plan, or any 2 dimensional image with at least 1 known dimension, to calculate its scale and directly measure other dimensions in the image. 
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 CTRL + SHIFT 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.
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