How to change the scale of a jpg file?

[Joef]

A workflow that I use quite often in Vectorworks and AutoCAD is to bring in a PDF or a JPG file and change the scale of it so I can trace over it. Is there a way to do this in Revit that I do not know about?

Joe

[Brian Myers]

Others will likely have a better solution, but you could create a Decal at a certain scale, create a view of it, and use that view as an underlay. You wouldn't be able to "snap" to it, but it could easily be made the correct scale.

[Joef]

Is there a way to scale a decal in Revit? Numerically, not graphically?

[Brian Myers]

Yes, if the original image is at a known scale or a part of that image is a known scale. Simply create an object that is exactly the same dimension as the original image/item you are scaling and scale the decal to it. If the decal was printed/created to the correct scale then attached to an object you know is at the correct scale... then the correct scale the decal will be (or at least within a tiny tolerance so small that it simply won't matter).

[rookwood]

I create a new drafting view and import the file. Once imported simply select the document making certain you haven't pinned it. Once selected, you can grab the grips and 'pull' in any direction to increase or decrease the size. As an alternate, once selected, you can use the RESIZE tool to resize by graphical or numerical value.

If the document was imported at no scale, I use reference lines offset by some value and resize to this dimension as accurately as I can.

Quite simple and very effective.

[LRaiz]

It sounds like Resize command should work nicely on your imported jpg.

[Brian Myers]

Quite simple and very effective.

Same principle as mine (works along the same "known scale" lines) but more elegant depending on your needs. I knew someone else would have a solution. ;)

[Joef]

Resize!! Thanks. I work in three different programs and it becomes a chore remembering the terms for identical operations in all of them. It's like switching languages. Thanks everyone!

Joe

[Chirag Mistry]

I believe if you select the image and look at properties, you can type the height and width.

[rookwood]

I believe if you select the image and look at properties, you can type the height and width.
You can resize this way. However, there are two issues: RESIZE and SCALE. Resize is very simple and can be acheived using several techniques. However, if you need to rescale, without a scaled import, it requires some trial and experimenting. Still simple enough.

[snurresprett9]

Others will likely have a better solution, but you could create a Decal at a certain scale, create a view of it, and use that view as an underlay. You wouldn't be able to "snap" to it, but it could easily be made the correct scale.

Excuse me! I didnt think you could show decals unless rendering the view?!

[Brian Myers]

Excuse me! I didnt think you could show decals unless rendering the view?!


Note to self: Never give advice unless you have Revit in front of you to try it..

I will promptly paste this on my head so I won't forget it and walk away to a corner. :shock: :roll:
You are indeed correct. That 1 oh '$h.. just wiped out my 723 attaboys. :?

[max]

There was a thread on this way back. I can't find it, but here is how to do it.

Import the image, select it, then click on properties using a known width or height, say width under properties is 93' 4 5/256" and you know it should be 150'. you measure this distance on the image and it is 100' 4". use the following formular under width properties

=93' 4 5/256"*(175'/100' 4")

This will rescale it. I hope I understood what you asked. That was hars to put in to words.


max

[Joef]

There was a thread on this way back. I can't find it, but here is how to do it.

Import the image, select it, then click on properties using a known width or height, say width under properties is 93' 4 5/256" and you know it should be 150'. you measure this distance on the image and it is 100' 4". use the following formular under width properties

=93' 4 5/256"*(175'/100' 4")

This will rescale it. I hope I understood what you asked. That was hars to put in to words.


maxNice tip to paste the calculation into the dialog box. I forget that Revit is smart that way. Thanks.

Joe

[LRaiz]

Using Resize command is even simpler.

1. Select jpeg and pick Resize command in the toolbar
2a. If you know real world distance between two points on jpeg then make sure that radio buttons in option bar select Graphical as opposed to Numeric
2a.1 Pick two points on jpeg such that you know the desired distance between them
2a.2 Revit will display a temporary dimension showing current measurement of the distance
2a.3. Type in desired distance value and hit Enter. Revit will scale jpeg to appropriately.
2b If you do know the scale factor then instead of "Graphical" choose "Numeric" radio button in the option bar
2b.1 Then type-in scale factor (you can use formula) and pick a point of scale origin on the screen. BTW I think this case is buggy because Revit does not pick picked point stationary (at least in 9.0)

HTH

[Joef]

Thanks Leonid. Often there will be a dimension on the jpg so all I have to do is pick the two points that define the dimension and type in that dimension. This is getting easier and easier.