topic Re: Align points of Raster Image in AutoCAD in AutoCAD Forum

Align points of Raster Image in AutoCAD

andrew.nichollsWG7U7 — Mon, 19 Dec 2016 22:59:18 GMT

Simple question and I think I know the answer but....

I am trying to align a jpeg with my drawing.

The drawing is real world co ords.

The jpeg is unknown thus the align.

The problem: No matter what two point I choose on the jpeg to align to (with the third being scale to) I am out. It does not match the outer boundaries. I am out anywhere from 2-5 metres.

My question: Is there a way to align using more than three points? say 6 or 8? Or do we just use the three and end up playing with scale?

Thanks

Andrew

@andrew.nichollsWG7U7; john.vellek has edited your subject line for clarity: Align command

Re: Align points of Raster Image in AutoCAD

pendean — Mon, 19 Dec 2016 22:59:37 GMT

Raster images are not manipulated that way by ALIGN command: and your lossy JPEG is likely not accurate enough either. What source did you grab this image from?

Re: Align points of Raster Image in AutoCAD

andrew.nichollsWG7U7 — Mon, 19 Dec 2016 22:59:59 GMT

I had to create the jpeg from a pdf of a legal subdivision plan. I realize I lose a lot as I have done this in the past but this time it is so far out as to be nearly useless.
Ultimately I would like to use the bearing and distance to recreate the plan but the plan is missing some of these. Not to mention that for what I need right now it takes far less time to trace the plan than to recreate it.
Thanks

Andrew Nicholls
Government of Saskatchewan
Roadside Technician
Traffic Engineering andDevelopment,
Ministry of Highways and Infrastructure

18-3603 Millar Avenue
Saskatoon SK S7P 0B2

Bus: 306-933-5801

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Re: Align points of Raster Image in AutoCAD

john.vellek — Mon, 19 Dec 2016 23:00:20 GMT

Hi @andrew.nichollsWG7U7,

Unfortunately, rubber-banding isn't possible with vanilla AutoCAD. To do that you need to investigate Raster Design. Here is a link to a free 30-day trial.

Please select the Accept as Solution button if my post solves your issue or answers your question.

Re: Align points of Raster Image in AutoCAD

scot-65 — Mon, 19 Dec 2016 23:31:09 GMT

A method that I might have used in the past:
- Insert the image into a blank drawing (Paste Special from clipboard).
- Draw a line on top of the image that represents a property
line segment from pin to pin of a labeled distance. At this point it is
not necessary to know the distance of the line. Hint: The longer the line,
the more accurate the scaling (and rotation). Line can be placed on layer
Defpoints.
- Move both the image and the line using one of the endpoints of
the line to the origin (0,0). This will be your reference (insert) point.
- Save the drawing as the underlay.

- Open the destination drawing.
- Drag and drop from your favorite file manager the underlay DWG.
- Start the block editor by double-clicking the underlay.
- In the properties window, towards the bottom, set Scale Uniformly to ON.
- Close the block editor.
- Command Scale, select the underlay, [Enter], select the endpoint that is
the origin, option "Reference", select that same endpoint, then the other
endpoint and drag to the correct distance (third point).
- The same can be done with command Rotate.

Fine tune the underlay by highlighting the underlay and adjust the scale
factor (and/or rotation) in the properties window.

???

Re: Align points of Raster Image in AutoCAD

TheCADnoob — Tue, 20 Dec 2016 13:54:41 GMT

AS @john.vellek mention raster design is the way to fly.

I have had some luck with other work around but they are never great as there is always the issue of perspective of raster images. i have exported a raster of the real coordinates from CAD and imported them into a raster editor capable of transforms and layered under the image i wanted to transform. I would then make the changes there and then insert back in CAD. This is a long complicated method and its never quite right.

Re: Align points of Raster Image in AutoCAD

andrew.nichollsWG7U7 — Tue, 20 Dec 2016 14:01:29 GMT

Thanks to you all. I will try your solutions as I can.