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cgps2raster.pro

top cgPS2Raster

Utilities, Graphics

cgPS2Raster, ps_filename, raster_filename [, /ALLOW_TRANSPARENT] [, /BMP] [, /DELETE_PS] [, DENSITY=integer] [, IM_COMMAND=string] [, IM_OPTIONS=string] [, FILETYPE=string] [, /GIF] [, HEIGHT=integer] [, /JPEG] [, OUTFILENAME=string] [, /PDF] [, /PNG] [, /PORTRAIT] [, RESIZE=integer] [, /SHOWCMD] [, /SILENT] [, /SUCCESS] [, /TIFF] [, WIDTH=integer]

The purpose of this program is to convert a PostScript file to a high resolution raster file, using the ImageMagick convert command to do the conversion. ImageMagick must be installed on your computer.

Note that one restriction the ImageMagick convert command imposes is that it cannot convert encapsulated PostScript files that are in landscape mode to raster files. These raster files will be clipped at one end of the file. If you wish to do the conversion properly, make sure encapsulated landscape plots are in portrait mode.

The program requires the Coyote Library to be installed on your machine.

Parameters

ps_filename in required type=string

The name of the input PostScript file that is being converted to a raster file. If not provided, the user will be asked to select a file.

raster_filename in required type=string

The name of the output raster file that is being converted from the PostScript file. If not provided, the output filename is created from the input PostScript file name. Note, this is the preferred way to create the output filename, since the OUTPUTNAME keyword has been depreciated as an input keyword.

Keywords

ALLOW_TRANSPARENT in optional type=boolean default=0

To make the background of some image files white, rather than transparent, you have to set the "-alpha off" string in the ImageMagick call. This string is automatically added to the ImageMagick call unless this keyword is set, in which case the string is not added and the image background will be transparent.

BMP in optional type=boolean default=0

Set this keyword to convert the PostScript output file to a BMP image. Requires ImageMagick.

DELETE_PS in optional type=boolean default=0

Setting this keyword will delete the PostScript file that is used as the intermediate file in the conversion to other file types.

DENSITY in optional type=integer default=300

The horizontal and vertical density (in dots per inch, DPI) of the image when the PostScript file is converted to a raster format by ImageMagick.

IM_COMMAND out optional type=string

Set this keyword to a named variable to return the ImageMagick command or commands used to produce the desired output. If this keyword is used, the ImageMagick commands are NOT executed, but are simply constructed and returned to the user. If a resize is required by using either the HEIGHT or WIDTH keywords, then the return value is a two-element string array. Otherwise, it is a scalar string.

IM_OPTIONS in optional type=string

A string of ImageMagick "convert" options that can be passed to the ImageMagick convert command. No error checking occurs with this string.

FILETYPE in optional type=string

This keyword provides a generic way of setting the BMP, GIF, JPEG, PNG, and TIFF keywords. Set this keyword to the type of file output desired, and the correct "output" keyword will be set.

GIF in optional type=boolean default=0

Set this keyword to convert the PostScript output file to a GIF image. Requires ImageMagick.

HEIGHT in optional type=integer

Set this keyword to set the height of the resulting raster file in pixel units. The width of the raster will be such as to preserve the aspect ratio of the starting image. This keyword cannot be used if the WIDTH keyword is used at the same time.

JPEG in optional type=boolean default=0

Set this keyword to convert the PostScript output file to a JPEG image. Requires ImageMagick.

OUTFILENAME out optional type=string

On exit, the name of the output file that was created.

PDF in optional type=boolean default=0

Set this keyword to convert the PostScript output file to a PDF file. Requires Ghostscript.

PNG in optional type=boolean default=0

Set this keyword to convert the PostScript output file to a PNG image. Requires ImageMagick.

PORTRAIT in optional type=boolean default=0

Set this keyword to indicate the PostScript file is in portrait mode. Otherwise, landscape mode is assumed.

RESIZE in optional type=integer default=25

If an image is being created from the PostScript file, it is often resized by some amount. You can use this keyword to change the value (e.g, RESIZE=80). Set this keyword to 0 to avoid any resizing of the output raster file. The value is passed on to resize argument as a percentage in the ImageMagick call.

SHOWCMD in optional type=boolean default=0

Set this command to show the command used to do any PostScript coversions.

SILENT in optional type=boolean default=0

Set this keyword to suppress output from the file. Is this keyword is set, be sure to check the Success keyword on exit.

SUCCESS out optional type=boolean

On exit, this keyword is set to 1 if the program successfully managed to create a raster file. It will be set to 0 otherwise.

TIFF in optional type=boolean default=0

Set this keyword to convert the PostScript output file to a TIFF image. Requires ImageMagick.

WIDTH in optional type=integer

Set this keyword to set the resulting width of the raster file. The height of the raster will be such as to preserve the aspect ratio of the starting image. This keyword cannot be used if the HEIGHT keyword is used at the same time.

Examples

To create a line plot in a PostScript file named lineplot.ps and also create a PNG file named lineplot.png for display in a browser, type these commands:

   cgPS_Open, FILENAME='lineplot.ps'
   cgPlot, Findgen(11), COLOR='navy', /NODATA, XTITLE='Time', YTITLE='Signal'
   cgPlot, Findgen(11), COLOR='indian red', /OVERPLOT
   cgPlot, Findgen(11), COLOR='olive', PSYM=2, /OVERPLOT
   cgPS_Close, /PNG

Author information

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

Copyright:

History:

Change History:

 Written by: David W. Fanning, 12 December 2011
 Added the ability to check to see if 8-bit or 24-bit PNG files should be created. 3 April 2012. DWF.
 Modified the ImageMagick commands that resizes the image to a particular width. Necessary
    to accommodate PNG8 file output. Using ImageMagick 6.7.2-9. 4 April 2012. DWF.
 Added FILETYPE keyword. 13 October 2012. DWF.
 Apparently Macs can't handle the version number, so I have removed the version number
     check for Macs. 13 October 2012. DWF.
 Worked on getting the WIDTH keyword to work correctly with Portrait mode files. 19 February 2013. DWF.
 Added the ability to set the number of bits per channel with TIFF files with the IM_TIFF_DEPTH
     keyword in cgWindow_SetDefs, and changed the default number of bits to 8 per channel
     from the previous 16. 14 May 2013. DWF.
 I changed the way raster files are resized because the results were inconsistent in the previous version.
     I now use a second "convert" command to resize the raster file that has previously been produced. 14 Jan 2014. DWF.
 Added HEIGHT keyword to allow the height of the raster file to be set. 14 Jan 2014. DWF.
 Added IM_COMMAND keyword to return the ImageMagick command or commands used to produce the raster file. 14 Jan 2014. DWF.
 New resize algorithm was noticably slower. Went back to a single ImageMagick command, but done correctly now. 15 Jan 2014. DWF.
 Problem with WIDTH and HEIGHT keywords being reversed. Had to do with putting this calculation before ROTATE in
     ImageMagick command. Now placed in the correct order, I think. 20 Feb 2014. DWF.
 Width can be set to zero in some instances. Now handling that case to undefine WIDTH. 1 March 2014. DWF.

File attributes

Modification date:	Fri Mar 27 11:07:39 2015
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Docformat:	rst rst

Coyote Graphics Routines

Date: Fri Mar 27 12:14:20 2015