;+ ; NAME: ; TVREAD ; ; PURPOSE: ; ; To get accurate screen dumps with the IDL command TVRD on 24-bit ; PC and Macintosh computers, you have to be sure to set color ; decomposition on. This program adds that capability automatically. ; In addition, the program will optionally write BMP, GIF, JPEG, ; PICT, PNG, and TIFF color image files of the screen dump. ; ; AUTHOR: ; ; FANNING SOFTWARE CONSULTING ; David Fanning, Ph.D. ; 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 ; ; CATEGORY: ; ; Graphics ; ; CALLING SEQUENCE: ; ; image = TVREAD(xstart, ystart, ncols, nrows) ; ; The returned image will be a 2D image on 8-bit systems and ; a 24-bit pixel interleaved true-color image on 24-bit systems. ; A -1 will be returned if a file output keyword is used (e.g., JPEG, TIFF, etc.). ; ; OPTIONAL INPUTS: ; ; XSTART -- The starting column index. By default, 0. ; ; YSTART -- The starting row index. By default, 0. ; ; NCOLS -- The number of columns to read. By default, !D.X_Size - XSTART ; ; NROWS -- The number of rows to read. By default, !D.Y_Size - YSTART. ; ; KEYWORD PARAMETERS: ; ; BMP -- Set this keyword to write the screen dump as a color BMP file. ; ; CANCEL -- An output keyword set to 1 if the user cancels out of a ; filename dialog. Set to 0 otherwise. ; ; COLORS -- If a 24-bit image has to be quantized, this will set the number ; of colors in the output image. Set to 256 by default. Applies to BMP, ; GIF, PICT, and PNG formats written from 24-bit displays.(See the ; COLOR_QUAN documentation for details.) ; ; CUBE -- If this keyword is set to a value between 2 and 6 the color ; quantization will use a cubic method of quantization. Applies to BMP, ; GIF, PICT, and PNG formats written from 24-bit displays.(See the ; COLOR_QUAN documentation for details.) ; ; DITHER -- If this keyword is set the quantized image will be dithered. ; Applies to BMP, GIF, PICT, and PNG formats written from 24-bit displays. ; (See the COLOR_QUAN documentation for details.) ; ; FILENAME -- The base name of the output file. (No file extensions; ; they will be added automatically.) This name may be changed by the user. ; ; image = TVREAD(Filename='myfile', /JPEG) ; ; No file will be written unless a file output keyword is used ; (e.g., JPEG, TIFF, etc.) in the call. By default the FILENAME is ; set to "idl". The file extension will be set automatically to match ; the type of file created. ; ; GIF -- Set this keyword to write the screen dump as a color GIF file. ; ; JPEG -- Set this keyword to write the screen dump as a color JPEG file. ; ; NODIALOG -- Set this keyword if you wish to avoid the DIALOG_PICKFILE ; dialog that asks you to name the output file. This keyword should be ; set, for example, if you are processing screens in batch mode. ; ; ORDER -- Set this keyword to determine the image order for reading the ; display. Corresponds to !Order and set to such as the default. ; ; OVERWRITE_PROMPT -- Set this keyword if you would like to get a prompt ; if you are overwriting a file. This applies only to operations with ; DIALOG_PICKFILE. ; ; PICT -- Set this keyword to write the screen dump as a color PICT file. ; ; PNG -- Set this keyword to write the screen dump as a color PNG file. ; ; TIFF -- Set this keyword to write the screen dump as a color TIFF file. ; ; TRUE -- Set this keyword to the type of interleaving you want. 1 = Pixel ; interleaved, 2 = row interleaved, 3 = band interleaved. ; ; TYPE -- Can be set to the type of file to write. Use this instead of ; setting BMP, GIF, JPEG, PICT, PNG, or TIFF keywords: TYPE='JPEG'. The ; primary purpose of this is to make event handlers easier to write. ; ; QUALITY -- This keyword sets the amount of compression for JPEG images. ; It should be set to a value between 0 and 100. It is set to 75 by default. ; (See the WRITE_JPEG documentation for details.) ; ; WID -- The index number of the window to read from. The current graphics window ; (!D.Window) is selected by default. An error is issued if no windows are ; currently open on a device that supports windows. ; ; _EXTRA -- Any keywords that are appropriate for the WRITE_*** routines are ; also accepted via keyword inheritance. ; ; COMMON BLOCKS: ; ; None ; ; RESTRICTIONS: Requires IDL 5.2 and higher. ; ; MODIFICATION HISTORY: ; ; Written by David W. Fanning, 9 AUG 2000. ; Added changes to make the program more device independent. 16 SEP 2000. DWF. ; Removed GIF file support for IDL 5.4 and above. 18 JAN 2001. DWF. ; Added NODIALOG keyword. 28 MAR 2001. DWF. ; Added an output CANCEL keyword. 29 AUG 2001. DWF. ; Added ERROR_MESSAGE code to file. 17 DEC 2001. DWF. ; Added ORDER keyword. 25 March 2002. DWF. ; Now create 24-bit PNG files if reading from a 24-bit display. 11 May 2002. DWF. ; Now create 24-bit BMP files if reading from a 24-bit display. 23 May 2002. DWF. ; Removed obsolete STR_SEP and replaced with STRSPLIT. 27 Oct 2004. DWF. ; Unleashed the GIF code for IDL 6.2 and above. 10 Nov 2005. DWF. ; Rolled back previous change to IDL 6.1. 24 Jan 2006. DWF. ; Fixed a problem in which 16-bit displays were treated as 24-bit displays, ; and as a result could not produce WHITE colors. Now all 16-bit displays ; are treated as 8-bit displays. It is an ugly trade-off. 24 Jan 2006. DWF. ; Added TYPE keyword 27 Sep 2006. DWF. ; Updated program to work with 24-bit Z-buffer in IDL 6.4. 11 June 2007. DWF. ; Added OVERWRITE_PROMPT keyword. 2 Oct 2008. DWF. ; Found an extra line of code that wrote PNG files twice! Removed. 10 Nov 2010. DWF. ; Replaced TVREAD_ERROR_MESSAGE with ERROR_MESSAGE. 25 Nov 2010. DWF. ;- ; ;******************************************************************************************; ; Copyright (c) 2008, 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. ; ;******************************************************************************************; FUNCTION TVREAD, xstart, ystart, ncols, nrows, $ BMP=bmp, $ Cancel=cancel, $ Colors=colors, $ Cube=cube, $ Dither=dither, $ _Extra=extra, $ Filename=filename, $ GIF=gif, $ JPEG=jpeg, $ NoDialog=nodialog, $ Order=order, $ Overwrite_Prompt=overwrite_prompt, $ PICT=pict, $ PNG=png, $ TIFF=tiff, $ True=true, $ TYPE=type, $ Quality=quality, $ WID=wid ; Error handling. Catch, theError IF theError NE 0 THEN BEGIN Catch, /Cancel ok = Error_Message() IF N_Elements(thisWindow) EQ 0 THEN RETURN, -1 IF thisWindow GE 0 THEN WSet, thisWindow RETURN, -1 ENDIF cancel = 0 ; Check for availability of GIF files. thisVersion = Float(!Version.Release) IF (thisVersion LT 5.3) OR (thisVersion GE 6.1) THEN haveGif = 1 ELSE haveGIF = 0 ; Go to correct window. IF N_Elements(wid) EQ 0 THEN wid =!D.Window thisWindow = !D.Window IF (!D.Flags AND 256) NE 0 THEN WSet, wid ; Check keywords and parameters. Define values if necessary. IF N_Elements(xstart) EQ 0 THEN xstart = 0 IF N_Elements(ystart) EQ 0 THEN ystart = 0 IF N_Elements(ncols) EQ 0 THEN ncols = !D.X_Size - xstart IF N_Elements(nrows) EQ 0 THEN nrows = !D.Y_Size - ystart IF N_Elements(order) EQ 0 THEN order = !Order IF N_Elements(true) EQ 0 THEN true = 1 dialog = 1 - Keyword_Set(nodialog) ; Do you want to write an image file instead of ; capturing an image? IF N_Elements(type) NE 0 THEN BEGIN CASE StrUpCase(type) OF 'BMP': bmp = 1 'GIF': gif = 1 'JPEG': jpeg = 1 'JPG': jpeg = 1 'PICT': pict = 1 'PNG': png = 1 'TIFF': tiff = 1 'TIF': tif = 1 ELSE: Message, 'Cannot write a file of type: ' + StrUpCase(type) + '.' ENDCASE ENDIF writeImage = 0 fileType = "" extention = "" IF Keyword_Set(bmp)THEN BEGIN writeImage = 1 fileType = 'BMP' extension = 'bmp' ENDIF IF Keyword_Set(gif) THEN BEGIN IF havegif THEN BEGIN writeImage = 1 fileType = 'GIF' extension = 'gif' ENDIF ELSE BEGIN ok = Dialog_Message('GIF files not supported in this IDL version. Replacing with JPEG.') writeImage = 1 fileType = 'JPEG' extension = 'jpg' ENDELSE ENDIF IF Keyword_Set(jpeg) THEN BEGIN writeImage = 1 fileType = 'JPEG' extension = 'jpg' ENDIF IF Keyword_Set(PICT) THEN BEGIN writeImage = 1 fileType = 'PICT' extension = 'pict' ENDIF IF Keyword_Set(png) THEN BEGIN writeImage = 1 fileType = 'PNG' extension = 'png' ENDIF IF Keyword_Set(tiff) THEN BEGIN writeImage = 1 fileType = 'TIFF' extension = 'tif' ENDIF IF N_Elements(colors) EQ 0 THEN colors = 256 IF N_Elements(quality) EQ 0 THEN quality = 75 dither = Keyword_Set(dither) ; On 24-bit displays, make sure color decomposition is ON. IF (!D.Flags AND 256) NE 0 THEN BEGIN Device, Get_Decomposed=theDecomposedState, Get_Visual_Depth=theDepth IF theDepth GT 8 THEN BEGIN Device, Decomposed=1 IF theDepth EQ 24 THEN truecolor = true ELSE truecolor = 0 ENDIF ELSE truecolor = 0 IF thisWindow LT 0 THEN $ Message, 'No currently open windows. Returning.', /NoName ENDIF ELSE BEGIN truecolor = 0 theDepth = 8 ENDELSE ; Fix for 24-bit Z-buffer. IF (Float(!Version.Release) GE 6.4) AND (!D.NAME EQ 'Z') THEN BEGIN Device, Get_Decomposed=theDecomposedState, Get_Pixel_Depth=theDepth IF theDepth EQ 24 THEN truecolor = true ELSE truecolor = 0 ENDIF ; Get the screen dump. 2D image on 8-bit displays. 3D image on 24-bit displays. image = TVRD(xstart, ystart, ncols, nrows, True=truecolor, Order=order) ; Need to set color decomposition back? IF theDepth GT 8 THEN Device, Decomposed=theDecomposedState ; If we need to write an image, do it here. IF writeImage THEN BEGIN ; Get the name of the output file. IF N_Elements(filename) EQ 0 THEN BEGIN filename = 'idl.' + StrLowCase(extension) ENDIF ELSE BEGIN filename = filename + "." + StrLowCase(extension) ENDELSE IF dialog THEN filename = Dialog_Pickfile(/Write, File=filename, OVERWRITE_PROMPT=Keyword_Set(overwrite_prompt)) IF filename EQ "" THEN BEGIN cancel = 1 RETURN, image ENDIF ; Write the file. CASE fileType OF 'BMP': BEGIN IF truecolor THEN BEGIN ; BMP files assume blue, green, red planes. temp = image[0,*,*] image[0,*,*] = image[2,*,*] image[2,*,*] = temp Write_BMP, filename, image, _Extra=extra ENDIF ELSE BEGIN TVLCT, r, g, b, /Get Write_BMP, filename, image, r, g, b, _Extra=extra ENDELSE END 'GIF': BEGIN IF truecolor THEN BEGIN CASE Keyword_Set(cube) OF 0: image2D = Color_Quan(image, 1, r, g, b, Colors=colors, Dither=dither) 1: image2D = Color_Quan(image, 1, r, g, b, Cube=2 > cube < 6) ENDCASE ENDIF ELSE BEGIN TVLCT, r, g, b, /Get image2D = image ENDELSE Write_GIF, filename, image2D, r, g, b, _Extra=extra END 'JPEG': BEGIN IF truecolor THEN BEGIN image3D = image ENDIF ELSE BEGIN s = Size(image, /Dimensions) image3D = BytArr(3, s[0], s[1]) TVLCT, r, g, b, /Get image3D[0,*,*] = r[image] image3D[1,*,*] = g[image] image3D[2,*,*] = b[image] ENDELSE Write_JPEG, filename, image3D, True=1, Quality=quality, _Extra=extra END 'PICT': BEGIN IF truecolor THEN BEGIN CASE Keyword_Set(cube) OF 0: image2D = Color_Quan(image, 1, r, g, b, Colors=colors, Dither=dither) 1: image2D = Color_Quan(image, 1, r, g, b, Cube=2 > cube < 6) ENDCASE ENDIF ELSE BEGIN TVLCT, r, g, b, /Get image2D = image ENDELSE Write_PICT, filename, image2D, r, g, b END 'PNG': BEGIN IF truecolor THEN BEGIN Write_PNG, filename, image, _Extra=extra ENDIF ELSE BEGIN TVLCT, r, g, b, /Get image2D = image Write_PNG, filename, image2D, r, g, b, _Extra=extra ENDELSE END 'TIFF': BEGIN IF truecolor THEN BEGIN image3D = Reverse(image,3) ENDIF ELSE BEGIN s = Size(image, /Dimensions) image3D = BytArr(3, s[0], s[1]) TVLCT, r, g, b, /Get image3D[0,*,*] = r[image] image3D[1,*,*] = g[image] image3D[2,*,*] = b[image] image3D = Reverse(Temporary(image3D), 3) ENDELSE Write_TIFF, filename, image3D, 1, _Extra=extra END ENDCASE RETURN, -1 ENDIF ; Return the screen dump image. RETURN, image END ;-------------------------------------------------------------------------------