image_dimensions.pro
7.05 KB
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; docformat = 'rst'
;
; PURPOSE:
; The purpose of this function is to return the various dimensions of the image,
; and also to extract relevant image information via output keywords. The
; function works only with 2D and 3D (24-bit) images, with or without alpha
; channels.
;
;******************************************************************************************;
; ;
; Copyright (c) 2011, by Fanning Software Consulting, Inc. All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
;
;+
; The purpose of this function is to return the various dimensions of the image,
; and also to extract relevant image information via output keywords. The
; function works only with 2D and 3D (24-bit) images, with or without alpha
; channels.
;
; :Categories:
; Utilities
;
; :Returns:
; A vector containing the size of each dimension of the image. It is equivalent
; to calling the SIZE function with the DIMENSIONS keyword set.
;
; :Params:
; image: in, optional, type=various
; The image variable from which information is to be obtained.
;
; :Keywords:
; alphachannel: out, optional, type=boolean
; This keyword is set to 1 if there is an alpha channel in the image. Otherwise,
; the keyword is set to 0.
; trueindex: out, optional, type=integer
; The position of the "true color" index in the return value. Is -1 for 2D images.
; xindex: out, optional, type=integer
; The index (position) of the X dimension in the return value.
; xsize: out, optional, type=integer
; The X size of the image.
; yindex: out, optional, type=integer
; The index (position) of the Y dimension in the return value.
; ysize: out, optional, type=integer
; The Y size of the image.
;
; :Examples:
; To load open a window of the appropriate size and display a 24-bit image::
;
; dims = Image_Dimensions(image24, XSize=xsize, YSize=ysize, TrueIndex=trueindex)
; Window, XSIZE=xsize, YSIZE=ysize
; TV, image24, TRUE=trueindex
;
; :Author:
; FANNING SOFTWARE CONSULTING::
; David W. Fanning
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
;
; :History:
; Modification History::
; Written by: David W. Fanning, 5 March 2003.
; Added support for alpha channel images, include ALPHACHANNEL keyword. 13 May 2009. DWF.
;
; :Copyright:
; Copyright (c) 2003-2011, Fanning Software Consulting, Inc.
;-
FUNCTION Image_Dimensions, image, $
; This function returns the dimensions of the image, and also
; extracts relevant information via output keywords. Works only
; with 2D and 3D (24-bit) images.
AlphaChannel=alphaChannel, $ ; Output keyword that indicates presence of alpha channel in image.
XSize=xsize, $ ; Output keyword. The X size of the image.
YSize=ysize, $ ; Output keyword. The Y size of the image.
TrueIndex=trueindex, $ ; Output keyword. The position of the "true color" index. -1 for 2D images.
XIndex=xindex, $ ; Output keyword. The position or index of the X image size.
YIndex=yindex ; Output keyword. The position or index of the Y image size.
On_Error, 2
; Get the number of dimensions and the size of those dimensions.
ndims = Size(image, /N_Dimensions)
dims = Size(image, /Dimensions)
alphaChannel = 0
; Is this a 2D or 3D image?
IF ndims EQ 2 THEN BEGIN
xsize = dims[0]
ysize = dims[1]
trueindex = -1
xindex = 0
yindex = 1
ENDIF ELSE BEGIN
IF ndims NE 3 THEN Message, /NoName, 'Unknown image dimensions. Returning.'
; This image could have an alpha channel, so we would have to look for a "4" instead of a "3".
true = Where(dims EQ 3, count)
IF count EQ 0 THEN BEGIN
true = Where(dims EQ 4, count)
IF count GT 0 THEN alphaChannel = 1 ELSE alphaChannel = 0
ENDIF
trueindex = true[0]
IF count EQ 0 THEN Message, /NoName, 'Unknown image type. Returning.'
CASE true[0] OF
0: BEGIN
xsize = dims[1]
ysize = dims[2]
xindex = 1
yindex = 2
ENDCASE
1: BEGIN
xsize = dims[0]
ysize = dims[2]
xindex = 0
yindex = 2
ENDCASE
2: BEGIN
xsize = dims[0]
ysize = dims[1]
xindex = 0
yindex = 1
ENDCASE
ENDCASE
ENDELSE
RETURN, dims
END