/[auctex]/auctex/preview/doc/preview-latex.texi
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revision 1.77 by dak, Sat Apr 2 00:51:12 2005 UTC revision 1.78 by angeli, Sun Apr 10 16:28:59 2005 UTC
# Line 644  with their version of XEmacs.  @w{GNU Em Line 644  with their version of XEmacs.  @w{GNU Em
644  What happens when @LaTeX{} is finished depends on the configuration of  What happens when @LaTeX{} is finished depends on the configuration of
645  @code{preview-image-type}.  What to do for each of the various settings  @code{preview-image-type}.  What to do for each of the various settings
646  is specified in the variable @code{preview-image-creators}.  The options  is specified in the variable @code{preview-image-creators}.  The options
647  to pass into GhostScript and what Emacs image type to use is specified  to pass into Ghostscript and what Emacs image type to use is specified
648  in @code{preview-gs-image-type-alist}.  in @code{preview-gs-image-type-alist}.
649    
650  @code{preview-image-type} defaults to @code{png}.  For this to work,  @code{preview-image-type} defaults to @code{png}.  For this to work,
651  your version of GhostScript needs to support the @option{png16m} device.  your version of Ghostscript needs to support the @option{png16m} device.
652  If you are experiencing problems here, you might want to reconfigure  If you are experiencing problems here, you might want to reconfigure
653  @code{gs-image-type-alist} or @code{preview-image-type}.  Reconfiguring  @code{gs-image-type-alist} or @code{preview-image-type}.  Reconfiguring
654  @code{preview-image-creators} is only necessary for adding additional  @code{preview-image-creators} is only necessary for adding additional
655  image types.  image types.
656    
657  Most devices make @previewlatex{} start up a single GhostScript process  Most devices make @previewlatex{} start up a single Ghostscript process
658  for the entire preview run (as opposed to one per image) and feed it  for the entire preview run (as opposed to one per image) and feed it
659  either sections of a @acronym{PDF} file (if PDF@LaTeX{} was used), or  either sections of a @acronym{PDF} file (if PDF@LaTeX{} was used), or
660  (after running Dvips) sections of a single PostScript file or separate  (after running Dvips) sections of a single PostScript file or separate
# Line 670  group @code{Preview Gs} for this. Line 670  group @code{Preview Gs} for this.
670  Another noteworthy setting of @code{preview-image-type} is  Another noteworthy setting of @code{preview-image-type} is
671  @samp{dvipng}: in this case, the @samp{dvipng}@pindex{dvipng} program  @samp{dvipng}: in this case, the @samp{dvipng}@pindex{dvipng} program
672  will get run on @acronym{DVI} output (see below for @acronym{PDF}).  will get run on @acronym{DVI} output (see below for @acronym{PDF}).
673  This is in general much faster than Dvips and GhostScript.  In that  This is in general much faster than Dvips and Ghostscript.  In that
674  case, the option  case, the option
675    
676  @item preview-dvipng-command  @item preview-dvipng-command
# Line 680  will get run for doing the conversion, a Line 680  will get run for doing the conversion, a
680  images get produced (@samp{dvipng} might be configured for other image  images get produced (@samp{dvipng} might be configured for other image
681  types as well).  You will notice that @code{preview-gs-image-type-alist}  types as well).  You will notice that @code{preview-gs-image-type-alist}
682  contains an entry for @code{dvipng}: this actually has nothing to with  contains an entry for @code{dvipng}: this actually has nothing to with
683  @samp{dvipng} itself but specifies the image type and GhostScript device  @samp{dvipng} itself but specifies the image type and Ghostscript device
684  option to use when @samp{dvipng} can't be used.  This will obviously be  option to use when @samp{dvipng} can't be used.  This will obviously be
685  the case for @acronym{PDF} output by PDF@LaTeX{}, but it will also happen  the case for @acronym{PDF} output by PDF@LaTeX{}, but it will also happen
686  if the @acronym{DVI} file contains PostScript specials in which case the  if the @acronym{DVI} file contains PostScript specials in which case the
687  affected images will get run through Dvips and GhostScript once  affected images will get run through Dvips and Ghostscript once
688  @samp{dvipng} finishes.  @samp{dvipng} finishes.
689    
690  @item preview-gs-options  @item preview-gs-options
691  Most interesting to the user perhaps is the setting of this variable.  Most interesting to the user perhaps is the setting of this variable.
692  It contains the default antialiasing settings @option{-dTextAlphaBits=4}  It contains the default antialiasing settings @option{-dTextAlphaBits=4}
693  and @option{-dGraphicsAlphaBits=4}.  Decreasing those values to 2 @w{or  and @option{-dGraphicsAlphaBits=4}.  Decreasing those values to 2 @w{or
694  1} might increase GhostScript's performance if you find it lacking.  1} might increase Ghostscript's performance if you find it lacking.
695  @end vtable  @end vtable
696    
697  Running and feeding GhostScript from @previewlatex{} happens  Running and feeding Ghostscript from @previewlatex{} happens
698  asynchronously again: you can resume editing while the images arrive.  asynchronously again: you can resume editing while the images arrive.
699  While those pretty pictures filling in the blanks on screen tend to  While those pretty pictures filling in the blanks on screen tend to
700  make one marvel instead of work, rendering the non-displayed images  make one marvel instead of work, rendering the non-displayed images

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