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Re: Is it possible to rotate a flipped image with cgImage? [message #88847 is a reply to message #88844]

Wed, 25 June 2014 06:14

atmospheric physics is currently offline

atmospheric physics
Messages: 121
Registered: June 2010

Senior Member

Hello Matthew,

Thanks for the example. If I see the images of im and (flipIm or rotflipIm), then there the rose color is changed to blue. I don't want to change the colors from my original image. I wanted to have my original image with all colors as they are and then only apply this flipping and rotation.

Without using interpolation, can't I retain my image as it is and enclose in the available space? I mean if the original image is a square type, the final rotflipIm can be rhombus type. Is this not possible? In order to fill the missing pixels of the im images, can't we use missing color as white?

Look's the image rotation is distorting the original image completely.

Thanks in advance,
Madhavan

On Wednesday, June 25, 2014 2:45:02 PM UTC+2, Matthew Argall wrote:
>> I get an error like this ...
>
>>
>
>> % POLY_2D: Expression must be an array in this context: I.
>
>
>
> The documentation says, "The image array to be rotated. This array can be of any type, but must have two dimensions."
>
>
>
> You can try separating the color channels and rotating them individually (below). Or you could try to convert the rgb values to color table indices.
>
>
>
> IDL> im = cgdemodata(16)
>
> IDL> help, im
>
> IM BYTE = Array[3, 227, 149]
>
> IDL> r = reform(flipIm[0,*,*])
>
> IDL> g = reform(flipIm[1,*,*])
>
> IDL> b = reform(flipIm[2,*,*])
>
> IDL> rrot = rot(r, 60, 0.8, /INTERP)
>
> IDL> brot = rot(b, 60, 0.8, /INTERP)
>
> IDL> grot = rot(g, 60, 0.8, /INTERP)
>
> IDL> rotflipIm = transpose([[[rrot]], [[grot]], [[brot]]], [2, 0, 1])
>
> IDL> help, rotflipim
>
> ROTFLIPIM BYTE = Array[3, 227, 149]
>
> IDL> cgimage, rotflipim

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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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