Rotate an Image by specified pixel

Imaq Rotate.vi is to rotate an image around its center point (correct?).
I need to rotate an image by a user-specified point in the image. What I have in mind is to expand the original image so that the specified point becomes the center of the new image, rotate this new image, and trim the image back to its original size. Is this the right way to do it? Or I am making it too complicated?

All right. First, do you want your "selected point" to have the same absolute coordinates in your new image as in the original? If yes, keep reading. If no, all that follows is irrelevant.
In the following discussion, you need to bear in mind that I have not used NI Vision stuff, but the Vision functions seem to be very straightforward. It seems NI has made it easy for you.
The first thing you have to do is determine the X,Y coordinates of the point you want to rotate around ("selected point"). I'll leave that to you, since you've got to pick a point somehow.
From the dimensions of the image, the coordinates of your point, and the angle you want to rotate your image through, calculate the X,Y vector that you will "move" your "selected point" along your coordinate system if you do a simple rotation.
From the Image Manipulation subpalette of the Vision Utilities palette, use the IMAQ Rotate function to rotate your image hawever far you want.
From the same subpalette, use the IMAQ Shift function to translate the entire image back along the vector you determined 2 steps ago to put the "selected point" back where it was originally.
If that doesn't do it, it's probably impossible .
I don't know how to break it down any better than that.
Cameron
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LR3-Library-Export-Image Resizing: Specifying Pixel WxH results in different WxH - tips please?

This is a multi-dimensional question (he he). I understand my problem is related to the original/developed WxH ratio. If the pixel WxH I spec in Export-Image Resizing doesn't match that developed proportion, the results are not what I want. In other words LR3 keeps the original/developed proportion and not what I want for that export. Ok, so I just answered my own question - but..... please give me some library or export tips for doing what I want to do.
What I do:
1 - I edit my images in RAW and like to keep them in their original proportions from my Canon camera as that is the proportion of HxW i use the most
2 - Later, if the image is really good (at least I like it), I may export it for different purposes and then may choose or require a different proportion.
3 - I would really like to not have to re-crop in Develop, then go back and Export, then go back to Develop and change it back to original.
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One of the reasons I do this is to create wallpapers for computers, for various printing/framing proportions, and then for web site situations. Windows XP (and I think the others) gets really slow if the program must re-size an image for wallpaper (why? go ask Mr. Gates... better get in line). So to keep performance high, it is best to create the image in the exact pixel dimensions of the monitor. This is always some weird number and not like anything else I do this for. The other reason is for a quick, custom print job for someone who wants an odd matting setup for framing (don't ask). This results in odd proportions. Regarding the web.... well smooshing a pic into a column etc. etc... Now while I am proud of my art and understand LR3 will expect me to re-crop to preserve my artistic brilliance, but really..... I would be happy with a proportional crop from the parallel sides of the offending dimension.
Also, when I spec a dimension, shouldn't the DPI gray out? What am not understanding here?
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Bruce,
As you correctly noticed, the WxH ratio in export represents a canvas, into which the exported image is fit. Here are some illustrations on what the different settings mean:
For what you are trying to achieve, you have to crop the image to the correct dimensions before doing the export. If I had to do it, I would create virtual copies of the original image as the last step and give each virtual copy its own crop, then export the virtual copies.
Bruce in Philly wrote:
Also, when I spec a dimension, shouldn't the DPI gray out? What am not understanding here?
The DPI resolution has no meaning for the size of the resulting image if you specify pixels in your export dimensions. But the resolution tag is written into the image, which might affect the way an image is printed, depending on the printing application.
But if you specify your export dimensions in inches or cm, the resolution together with the dimensions in inch/cm determine the size of the resulting image in pixels. I.e. if you specify 5x7" and 300DPI, your exported images size will be 1500x2100 pixels.
Beat

How can i rotate an image by a pivot point?

Hello,
i have a problem, the Imaq Rotate VI only rotate an image by its center. My problem is i need to do this by a known pivot point. How can i achieve this?
Thank you,
Francesco.
Solved!
Go to Solution.

can this post help?
http://forums.ni.com/t5/LabVIEW/Rotate-an-Image-by-specified-pixel/td-p/2570453
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13

Does rotating an image several times affect the quality?

I'm using a template for a cd sleeve. One half of it is upside down so to work on the other half I have to rotate the image. I will have to rotate the image a hundred times before the project is finished.
Does this affect the quality? If so, any workarounds for me?
Thank you.

As the previous poster said - use non-destructive transform methods wherever you can. Apart from that, note, that rotating in multiples of 90 degrees does not change the pixels' color and transparency information, as this always coincides with the imaginary rectangular/ square pixel grid and pixels only get re-arranged. Only rotations at different angles will enforce resampling, meaning that in particular edges will be recalculated to keep them visually smooth. Doing this multiple times will result in softening, as the way Photoshop works, it has no knowledge of previous transforms and will apply the full sampling again in a "dumb" manner. Smart objects avoid that limitation, as they concatenate operations, i.e. a rotation of +60 degrees followed by one -20 degrees will be treated as a single 40 degree rotation. Likewise, CS4's canvas rotation, is merely a secondary rotation applied to the screen buffer, not affecting the image itself.
Mylenium

Problems to rotate rectangular images

Hello,
I wrote code to rotate BMP images, and it works very good with square images. But it doesn't work with rectangular ones. When I try to rotate them, I obtain an images with all pixels in a wrong position, so that it is impossible to understand the content... WHY ??
thank you
                    //BufferedImage toStore
                    BufferedImage toStore = new BufferedImage(Width,Height,BufferedImage.TYPE_INT_RGB );
                    Graphics2D g2d =toStore.createGraphics();
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ok sorry. I made a stupid mistake some lines after.
thank you anyway!Ah yes. It's always where you least expect it.

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Thanks for the explanation, it was very helpful
Paolo Guercio
Il giorno 11/nov/2014, alle ore 17:00, Vikas.Sharma <[email protected]> ha scritto:
If you place in Muse - an image with either height or width larger than 2048 pixels - Muse scales the image down proportionately, limiting the larger dimension to 2048.
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>

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I'm wondering how to stop Lightroom from "squaring up" my images when I import them. Attached is a screen shot to illustrate.
I also can't find any consistentency, if I import the same image three times it will be as above twice but not on the third time!
I'm wondering if this is a metadata thing?
BTW camera is a Nikon D600.
With thanks in advance,
-Simon

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http://members.lightroomqueen.com/Knowledgebase/Article/View/1148/198/how-do-i-delete-the- lightroom-preferences-file

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Hi,
I have a small problem using images...
1. I have an existing image...
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Thanks for responding to my query. I'll check out the thumbnail size.
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Rotate an Image by specified pixel

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