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Re: Is it possible to rotate a flipped image with cgImage? [message #88844 is a reply to message #88842] Wed, 25 June 2014 05:45 Go to previous messageGo to previous message
Matthew Argall is currently offline  Matthew Argall
Messages: 286
Registered: October 2011
Senior Member
> 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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