This is the way I get the true size of scanned images.

On the the drawing, choose two pairs of points that are easily found on the imported image. One pair in the X-direction and the other in the Y-direction.

Measure these distances as accurately as you can - let's call them **xd** and **yd**.

In model space, use the dimension tool to create two dimensions; one between the two x scale points and one between the two y scale points. Suppose these turn out to be **xm** and **ym**.

Select the whole image in model space, including the the two dimensions, and then tab into the x-scale field, press **F2** to bring up the calculator and type **xd/xm** and press **enter**. Copy and paste the result into the **x-scale** field, hit tab to select the **y-scale** field, use the calculator to compute **yd/ym** and copy/paste the result in the **y-scale** field. The press **Enter** to scale the entire model correctly. The dimensions should now show the measured values and the whole image is the correct size.

I do the x and y scales separately because scanners often generate slightly inconsistent aspect ratios. If you are satisfied that your scanned image has the correct aspect ratio you can use a single dimension and insert the same ratio in both the x and y scale fields.

Logged

Gary Wooding

Win10 64-bit,

TC21.2 x64 Plat, Bld59

TC16.2 Plat, Bld54.0

TCC 3.5