How do you scale inserted images?

[oldtbone55]

I have two scanned images that I want to insert into Fusion and I know that you need to use the insert/insert canvas command to do so but how do you determine what scale to use when doing so or does it really matter? I know that I'll need to use the create/spline command to trace the drawing out to create an actual sketch that I can dimension. 

Thanks.

[TheCADWhisperer]

There is a scale tool in the Canvas image tool.

You should know a length at some portion of the image.

Simply click the points between the distance and enter the correct distance.

Attach your *.f3d file here if you can't figure it out.

[oldtbone55]

I've attached the file.

Thanks.

[Anonymous · Accepted solution]

Here is the screencast:

[fireflynj]

why can't it figure out DPI?  If I scan an image at 300 DPI it should know the scale.

[oldtbone55 · Accepted solution]

What you're referring (300dpi) to isn't the scale it's the resolution. Fusion can't know what your scale is based on this. As long as you know the dimension of any part of your drawing you can scale the document using that one measurement. Access the menu by right clicking on the canvass you've imported and you will see s selection for scaling the image. Pick the start and end point of the dimension, enter the dimension value and hit enter. Your image will now be scaled. 

[fireflynj]

so there isn't a way to tell it that 300 dots = one inch?    I didn't like the ruler, open to human error.

[laughingcreek]

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@fireflynj wrote:

so there isn't a way to tell it that 300 dots = one inch?    I didn't like the ruler, open to human error.

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nope!

[oldtbone55]

DPI refers to resolution. It's not a scale. Just pick a section of the image where you know the measurement. It should be s straight section of the image, not a curved portion. For instance, I know the length of my guitar body based on its center line so I pick one point at one end and another point at the other end of the centerline and enter the measurement. Once you do that the rest of the body will be scaled accordingly. 

[oldtbone55]

No. 

[drjrkuhn]

I know this thread is a bit old, but I still don't see a solution. Speaking from 30 years of scientific imaging (microscopy), image tags can absolutely contain proper canvas scaling information! For example, Tiff tags contain resolutions as both a unit and pixel scale (even a fractional version). Sometimes that is pixels per cm, sometimes dpi. I use those all the time. So, for example, if I scanned an accurate 1:1 blueprint or drawing at 200 dpi, then the initial import should scale it to that size. So yes, the DPI in the image should be honored as the initial scale.