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Re: Is it possible to rotate a flipped image with cgImage? [message #88853 is a reply to message #88842]

Wed, 25 June 2014 09:58

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Madhavan Bomidi writes:

>
> I have a .JPG image, which requires flipping over the top-down axis before rotating the image by 60 degrees ( clockwise counting ).
>
> I now read the JPG image file as below and place:
>
> READ_JPEG,ImgFile.JPG,img,/ORDER
> ; Flipping the image
> flipHorImg = REVERSE(img,1)
> ; Rotate the flipped image by 60 deg clockwise direction
> rotImg = ROT(flipHorImg,60,0.8,/INTERP)
> cgImage,rotImg,Position=pos2,/OVERPLOT
>
> I get an error like this ...
> % POLY_2D: Expression must be an array in this context: I.
>
> I don't see a problem with flipping of the image, but there is actually a problem with rotated image. While I know that with cgImage, I can use the keyword /NEGATIVE for flipping the image but there is no option for rotating the flipped image. Anyone with a solution and an example will be of great help.

I would do it like this:

filename = Filepath(SubDir=["examples","data"], "marsglobe.jpg")
imageOrig = Read_Image(filename)
image = Transpose(imageOrig,[1,2,0]) ; For ease of handling
image = Reverse(image,2) ; Reverse in Y direction
r = Rot(image[*,*,0], 60, 0.9, Missing=255)
g = Rot(image[*,*,1], 60, 0.9, Missing=255)
b = Rot(image[*,*,2], 60, 0.9, Missing=255)
rotImage = [[[r]],[[g]],[[b]]]
cgDisplay, 900, 300
!P.Multi = [0,3,1]
cgImage, imageOrig
cgImage, image
cgImage, rotImage
!P.Multi=0
END

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thue. ("Perhaps thos speakest truth.")

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[Message index]

		Is it possible to rotate a flipped image with cgImage? By: atmospheric physics on Wed, 25 June 2014 04:56
		Re: Is it possible to rotate a flipped image with cgImage? By: Matthew Argall on Wed, 25 June 2014 05:45
		Re: Is it possible to rotate a flipped image with cgImage? By: atmospheric physics on Wed, 25 June 2014 06:14
		Re: Is it possible to rotate a flipped image with cgImage? By: Mats Löfdahl on Wed, 25 June 2014 07:00
		Re: Is it possible to rotate a flipped image with cgImage? By: Matthew Argall on Wed, 25 June 2014 07:11
		Re: Is it possible to rotate a flipped image with cgImage? By: David Fanning on Wed, 25 June 2014 09:58
		Re: Is it possible to rotate a flipped image with cgImage? By: atmospheric physics on Thu, 26 June 2014 09:39

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