Rotate a circular image

I would like to be able to display a circular image, which can then be rotated. The image is typically of a valve for controlling the flow of liquid. I need to be able to display its current position between 0 and 359 degrees with respect to its input/output ports. As most images are rectangular, can a image be laid onto a circular tool such as a dial so as to only display the circular section. I understand it is possible to rotate tools. I am currently using LabView 8.5.
Has anyone any experience of rotating images or masking an image for a circular representation?

Ben wrote:
Rather than deal with the tedious work of masking around the circle I suggest you place a decoration with a transparent center region over the rotated image and just let the region of interest show through.
It's not very tedious. Simply check for the radius and substitute the background color if a pixel is outside the circle.
Here's a very rough draft modification of my old VI. Modify as needed.
Message Edited by altenbach on 06-03-2008 06:45 AM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
rotateCircularMask.png ‏150 KB

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Animation in illustrator cs4: pan & rotate across large image while animating text?

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Thanks Monica,
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How to rotate a thumbnail image in Finder?

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Hello all
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<title>Stretched Background Image</title>
<style type="text/css">
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</body>
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Hi
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Don't multi post! One thread is enough! Locked. I'll delete this later.

Scale and rotate a tiff image

How do you scale and rotate a tiff image without running out of memory?
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MediaTracker tracker = new MediaTracker (this);
tracker.addImage (img, 0);
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catch(InterruptedException e) {
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catch (Exception e)
e.printStackTrace();
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Image scaled = originalImage.getImage().getScaledInstance(
(int)(currentWidth * 1.5),
(int)(currentHeight * 1.5),
Image.SCALE_FAST);
I tried this method, it works and does what i want but the scrolling and loading is too slow.
public void paintComponent(Graphics g)
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g2D.drawImage(image, 0,0,(int)dimension.getWidth(), (int)dimension.getHeight(), this);
Help plss.

Nvm got the answer :)

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Hello,
I would like to perform flip and +/-90� rotation on an image but after a rotation, the flip is performed in the wrong direction my code looks like this :
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g2D.translate(width/2,height/2);
g2D.scale(-1,1);
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Why rotated rectangle tool can't draw rotated ROI on image?

I want to use the tool window to draw a rotated rectangle on image, but each time, it seems only draw a rectangle, it can't rotate. Don't know why?
In Vision Assitant, if I use rotated rectangle tool, it will show like this:
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Run the sample code: C:\Users\Public\Documents\National Instruments\CVI\samples\Vision\2. Functions\Geometric Matching, change imaqShowToolWindow (FALSE);
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on line 93#. Compile then run. Seems I also can't rotate my ROI, don't know why?
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Hi,
You cannot perform action on an overlay. In order to achieve what you want to do, I suggest you to use the ROI property in an image property node. Then just pass your ROI coordinates, the ROI will be updated automatically whenever your coordinates changes. You can drag a ROI this is impossible with an overlay.
Regards

Rotate part of image

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With your image open, you could use any of the selection tools to make a selection and then rotate that selection only.
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Hi all,
I'm trying to rotate a perfectly round object in Premiere 6 on Windows 7.
First of all, I am now importing this round object in a square PSD file layer and setting it to "Maintain Aspect Ratio" under "Clip>Video Options".
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Is there a way to fix this besides trying (virtually impossible) to compensate for the distortion with the "Distortion" control in the Motion Settings dialog box?
Previously, someone else on this forum answered a similar question this way...
"Remember, Premiere Rotates on the rectangular Frame, and not by an object in that Frame."
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Thanks for any input,
digi

https://support.apple.com/kb/TS1713
try this, best I can do

How can I rotate a screen image on a peripheral monitor?

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I have now returned the Dell laptop after transferring all my files to my MacBook. Today I connected the MacBook to the Samsung for the first time, and was stunned to see the Mac screen appearing at the 90-degree rotation. No matter what I do, I can't figure out how to restore it. So I have this huge monitor and basically it's showing me the same screen size as I have on my laptop. When I change the resolution, it just gets distorted. And nowhere can I find out how to rotate the image back to landscape.
Online, the only instructions I have found refer to a Preferences Panel in the Displays section of the System Preferences which allows you to choose a rotation. However, I can't locate that panel. I tried to find it through Spotlight, using the word "rotate," and here's what came up:
It lists "Displays" as one of the first two hits
But when I click on that, I get the "Displays" window labeled "Color LCD"
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Click the gear button on the clip and select Cropping & Rotation.
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Jagged Edges after rotating a stroked image

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When I have a photo in cs2-cs3-cs4 etc and I rotate it at an angle I get fine jagged edges all along the sides. It's becomes very pronounced in a stroked image even when I I stroke the image after rotation. The problem is more obvious when the image is not at angles like 45 or 90 degrees but more visible at in between angles.
Any suggestions?

ryanroy.roy wrote:
I've have this problem a lot but I guess I'm just now getting around to ask about it.
When I have a photo in cs2-cs3-cs4 etc and I rotate it at an angle I get fine jagged edges all along the sides. It's becomes very pronounced in a stroked image even when I I stroke the image after rotation. The problem is more obvious when the image is not at angles like 45 or 90 degrees but more visible at in between angles.
Any suggestions?
What you are seeing is alaising, and it is inherent in raster graphics when the line to be shown is not parallel to the columns or rows of the image.It can be mitigated to some extent by antialaising, which softens the edges of the diagonal lines. When you select all of an image and stroke for a border, antialaising is used. With the polygonal lasso tool, you can turn antialaising on or off. Alaising is less apparent with very high resolution, but it can't be elilminated.
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Rotate a circular image

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