Rotating viewport = distorted image

[MREveretts]

Help please - Any viewport rotation other than a multiple of 90 results in distorted image.  On the atttached pdf, the top vp is rotated 90 degrees (image looks the same as it does in model space - good), the bottom is rotated 135 (image is very light, almost a negative in places - bad).

I attached the geotiffs in dwg1 using mapinsert with no adjustment other than some fade, and am referencing dwg1 into dwg2.  Plotting from dwg2.

I initially rotated the all the views with alignspace, when I noticed the problem.  I've since tried creating a new vp and just rotating/clipping it, same result.  

Any ideas?

Thanks!

MRE

[Jay_B]

Have you tried the DVIEW command using the TWIST subcommand from within Model Space of the Viewport?

[MREveretts]

yes, same results 

[doni49]

What version and can you post your dwg and image files?

Also -- have you tried this with other images just to troubleshoot?

EDIT:  I just tried to reproduce it in C3D 2012 and it seems to have worked fine.  I attached a Google Earth image in modelspace then in the layout, I placed two VPs -- the left one is unrotated and the right one is rotated 45 degrees.  I don't notice any difference.

[MREveretts]

It only seems to be a problem with 6-inch resolution geotiffs.  County-wide mrsid's rotate fine.  hmmm....  Maybe I can do something with the geotiffs in arcmap?

Here's where I get my aerials  ISDP fort wayne, IN

Thanks for thinking through this with me!

[MREveretts]

I've gotten around the probelm by creating a new image file from the original 2012 6-inch resolution geotiffs.  I used ArcMap's File>export to get a single new file as a jpg (with world file).  This new file looks fine in a rotated viewport.

Yay for work-arounds!

[sdl051]

I am also experiencing an error using "alignspace" in C3D 2012 SP2. I have used this command for years rotating/scaling viewports in paperspace for plotting purposes. The command seems to be working normally until the rotation is actually calculated and the VP is redisplayed. The VP rotation is in the same area, but not at all near the rotation reference given.

I have heard of someone else suffering issues with the "align" command in model space as well.

Any idea?

[LyleHardin]

Interesting. I just ran across this myself. (Well, one or our users). These large 6" resolution tiffs (we get ours from Gateway) are multi layered tif images and when the viewport is rotated, they show up negative through the viewport. I've used Raster Design to save the images as .jpeg to remedy the situation.

Also, thanks for the tip on the ALIGNSPACE command. I never knew about that one!

[sfore]

Saving images thru Raster as a jpeg worked great. Still don't understand why tiffs behaved that way when viewport has twist, but whatever works. Image still looks as good as when it was a tiff.