DJVIEW4(1)

NAME
djview4 - Standalone DjVu viewer

SYNOPSIS
djview4 [options] [argument]

DESCRIPTION
Standalone viewer for DjVu files. Features include navigating documents, zooming and panning page images, producing and displaying thumbnails, displaying document outlines, searching documents for particular words in the hidden text layer, copying hidden text to the clipboard, saving pages and documents as bundled or indirect multi-page files, and printing page and documents. The viewer can simultaneously display several pages using a side-by-side or a continuous layout.

COMMAND LINE ARGUMENT AND OPTIONS
This program can run as a standalone program or as a slave process for the DjVu browser plugin nsdejavu. When running as a standalone program, the command line argument argument can be:

*   The filename of a valid DjVu document.

*   A local DjVu document URL of the form:

    file:///path/name.djvu[?djvuopts&keyword=value&...]

    The square brackets delimit the optional components of the URL. Various options can be specified using a syntax similar to that of CGI arguments. Specifying options in this manner is very useful for a browser plugin because there are no command line arguments. In the case of a standalone viewer, all options can be specified as command line arguments.

*   An remote DjVu document URL of the form:

    http://host/path/name.djvu[?djvuopts&keyword=value&...]

    https://host/path/name.djvu[?djvuopts&keyword=value&...]

    Browsing remote DjVu documents with the standalone viewer is less efficient than using the browser plugin. The standalone viewer does not benefit from the browser caching strategies and proxy settings. Proxy settings for the standalone viewer can be set independently with the preferences dialog.

An extensive list of options are recognized. Most options can be specified as command line argument starting with the customary dash character (-) or using the syntax of CGI arguments in the document URL. Some options however are only meaningful as command line arguments. Other options are only recognized when running the X11 version of the djview4 program.

COMMAND LINE OPTIONS
The following options are only meaningful when specified on the command line.

-help
    Display a brief help message.

-verbose
    Prints informational messages on the console. This option is very useful because it displays messages about the unrecognized constructs in the DjVu annotation and hyperlink layers.

-fullscreen, -fs
    Start djview4 in full screen mode. Use the key ESC to exit the full screen mode.

-slideshow[=arg]
    Start djview4 in slide show mode. The optional numerical argument arg specifies the number of seconds before turning each page. Use the key ESC to exit the slide show mode.

-style=stylename
    Specify the graphical user interface style. The recognized values for stylename depend on the installed version of the Qt toolkit. Common style names include cde, motif, plastique, platinum, and windows.

X11 OPTIONS
The following command line options are recognized by the X11 version of the djview4 program. Unlike most djview4 options, X11 options that demand an argument do not use the equal character to introduce their argument.

-display displayname
    Specify that the djview4 windows should appear on the X11 display displayname.

-geometry WxH+X+Y
    Specify the initial size and position of the first window using the traditional X11 geometry specification syntax. The numerical arguments W and H represent the initial window width and height. The numerical arguments X and Y indicate the window position relative to the top left corner of the screen.

-name name
    Set the application name.

-title title
    Set the title of the first window.

-fn fontname, -font fontname
    Specify the name of the default font used for buttons and menus. The font should be specified using a X logical font description string.

-bg color, -background color
    Specify the default background color for graphical user interface elements. The color should be given as a standard X11 color name.

-fg color, -foreground color
    Specify the default foreground color for graphical user interface elements. The color should be given as a standard X11 color name.

-btn color
    Specify the default button color. The color should be given as a standard X11 color name.

-ncols count
    Limit the number of colors allocated on a 8 bit display. The default color cube contains 216 distinct colors.

-cmap
    Force the allocation of a private color map on a 8-bit display. This might increase the color quality but cause flashing when the viewer window gets activated.

GENERAL OPTIONS
The following options can be specified as command line options or can be passed by augmenting the document URL using a syntax similar to that of CGI arguments

    http://.../file.djvu?djvuopts&key=value&key=value&...

In order to separate real CGI arguments from these options, the viewer only recognizes keywords that appear after the word djvuopts. The keywords key are derived from the option names by removing the initial dashes.

-page=pagename
    Display a specific document page. The viewer first searches a page whose identifier matches the argument pagename. Otherwise, if pagename is a number preceded by character + or -, the viewer performs a displacement relative to the current page. Otherwise, starting from the current page and wrapping around, it searches for a page whose title matches the argument pagename. Otherwise, if pagename is numerical, it is interpreted as an ordinal page number. Otherwise, and finally, the viewer searches a page whose name matches pagename.

-pageno=pagenumber
    The page searching algorithm for option page can cause ambiguities when page titles can be interpreted as numbers. The argument of option pageno is always interpreted as an ordinal page number. This option is less portable than page because it is not recognized by earlier versions of the djvu plugin. When using this option is necessary, it is advisable to use both the page and pageno options.

-zoom=zoomfactor
    Specify the initial zoom factor. Unless the toolbar, pop-up menu and keyboard are disabled, the user will be able to change the zoom factor. Legal values for zoomfactor are shown in the below:
    one2one | Select the "one-to-one" mode.
    width | Select the "fit width" mode.
    page | Select the "fit page" mode.
    stretch | Stretch the image to the plugin window size.

-showposition=px,py
    Specify a point in the current page that should be as close as possible to the center of the window. The horizontal and vertical positions px,py in the current page are given as fractions in range 0 to 1. For instance, 0,0 designates the upper left corner of the page, 0.5,0.5 is the center, and 1,1 is the lower right corner.

-mode=modespec
    Specify the initial display mode. Unless the toolbar and pop-up menu are disabled, the user will be able to change it. Legal values for modespec are shown in the below:
    bw | Display the foreground mask only.
    fore | Display the foreground only.
    back | Display the background only.
    text | Overlay the hidden text over the color image.

-hor_align=keyword, -halign=keyword
    Specify the horizontal position of the page in the viewer window. (This does not specify what part of the page will be shown, but rather how margins will be laid out around the page in the plugin window.) Argument keyword must be left, center, or right.

-ver_align=keyword, -valign=keyword
    Specify the vertical position of the page in the viewer window. (This does not specify what part of the page will be shown, but rather how margins will be laid out around the page in the plugin window.) Argument keyword must be top, center, or bottom.

-cache=(yes|no)
    Enable or disable the caching of fully decoded pages of the document. Caching is on by default. Caching of documents whose URL does not contain an extension .djvu or .djv is off by default.

-continuous=(yes|no)
    Enable or disable the continuous layout of multipage documents.

-sidebyside=(yes|no), -side_by_side=(yes|no)
    Enable or disable the side-by-side layout of multipage documents.

-coverpage=(yes|no)
    Specify whether the cover page must be displayed alone when multipage documents are shown in side-by-side layout.

-righttoleft=(yes|no)
    Specify whether pages should be arranged right-to-left when multipage documents are shown in side-by-side layout.

-layout=keyword{,keyword}
    Specify the layout settings using a single list of comma-separated keywords. The following keywords are recognized:
    double | Enable the side-by-side mode.
    continuous | Enable the continuous mode.
    cover,nocover | First page treatment in side-by-side mode.
    ltor,rtol | Layout direction for side-by-side mode.
    gap,nogap | Specify whether there is a gap between pages.

-scrollbars=(yes|no)
    Enable or disable the presence of scroll bars when the full image size exceeds the plugin window size. The default is yes.

-frame=(yes|no)
    Enable or disable the display of a thin frame and shadow around the DjVu images. Frames are enabled by default.

-background=color
    Specify the color of the background border displayed around the document. The color color must be given in hexadecimal RRGGBB or #RRGGBB format.

-toolbar=keyword{(,|+|-)keyword}
    Controls the appearance and the contents of the toolbar. The argument of option toolbar is composed of a number of keywords separated by characters comma, plus or minus. The appearance of the toolbar is controlled by keywords placed before the first occurrence of a character plus or minus. The following keywords are recognized in this context:
    always | Displays the toolbar.
    auto | Enable toolbar "autohide" mode (not implemented).
    top | Place toolbar along the top edge.
    bottom | Place toolbar along the bottom edge.

    The contents of the toolbar is controlled by keywords placed after the first occurrence of a character plus or minus. Each keyword adds (after a plus) or removes (after a minus) a particular toolbar button or group of buttons. The initial content of the toolbar is determined by the first occurrence of a character plus or minus. When this is a plus, the toolbar is initially empty. When this is a minus, the toolbar initially contains the default selection of buttons. The following keywords are recognized:
    zoomcombo | for the zoom selection tool.
    zoom | for the zoom buttons.
    select | for the selection button.
    rotate | for the image rotation buttons.
    find | for the text search button.
    new | for the new window button.
    open | for the open new document button.
    save | for the save button.
    print | for the print button.
    layout | for the page layout buttons.
    pagecombo | for the page selection tool.
    firstlast | for the first-page and last-page buttons.
    prevnext | for the previous- and next-page buttons.
    backforw | reserved for the back and forward buttons.
    help | for the contextual help button.

For the sake of backward compatibility, the keywords fore, fore_button, back, back_button, bw, bw_button, color, and color_button are interpreted like keyword modecombo; the keyword rescombo is a synonym of zoomcombo; the keywords pan, zoomsel, and textsel are interpreted like keyword select; and the keyword doublepage is interpreted like keyword layout. All other keywords are ignored.

-menubar=(yes|no)
    Enable or disable the presence of the menu bar located on top of the window.

-statusbar=(yes|no)
    Enable or disable the presence of the status bar located at the bottom of the window.

-sidebar=keyword{,keyword}
    Control the dockable panels. The argument is a comma separated list of keywords. A first group of keywords selects which panels are affected. Omitting these keywords selects all panels. A second group of keywords then controls the visibility and the position of the selected panels.
    outline,bookmarks | specify the outline panel.
    search,find | specify the search panel.
    yes,true | show the specified panels (default).
    no,false | hide the specified panels.
    left | dock specified panels on the left side.
    right | dock specified panels on the right side.
    top | dock specified panels on the top side.
    bottom | dock specified panels on the bottom side.

-thumbnails=keyword{,keyword}
    Compatibility alias for -sidebar=keyword{,keyword},thumbnails.

-outline=keyword{,keyword}
    Compatibility alias for -sidebar=keyword{,keyword},outline.

-menu=(yes|no)
    Enable or disable the pop-up menu.

-keyboard=(yes|no)
    Enable or disable the DjVu plugin keyboard shortcuts. The default is yes (enabled). Note that disabling the keyboard handling does not disable the shortcuts associated with active menus (see options -menu and -menubar), visible toolbars and sidebars (see options -toolbar and -sidebar).

-mouse=(yes|no)
    Enable or disable mouse interaction for panning and selecting. The default is yes (enabled).

-links=(yes|no)
    Enable or disable hyper-links in the DjVu image. Hyper-links are enabled by default.

-highlight=x,y,w,h[,color]
    Display a highlighted rectangle at the specified coordinates in the current page and with the specified color. Coordinates x, y, w, and h are measured in document image coordinates (not screen coordinates). The origin is set at the bottom left corner of the image. The color color must be given in hexadecimal RRGGBB or #RRGGBB format. Multiple highlighted zone can be specified and can be interspersed with multiple -page=pagename options.

-find=text
    Highlight occurrences of the given string text. This option works when the document contains a hidden text layer. It can be used in conjunction with -sidebar=find to display the text searching interface. String text can be terminated by slash (/) followed by letters specifying search options. The following letters are recognized
    C | Case-insensitive search (default).
    w | Search hits start on word boundaries (default).
    W | Ignore word boundaries.
    r | Regular expression search.
    R | String search (default).

-rotate=(0|90|180|270)
    Rotate the djvu image by the specified angle expressed in degrees counter-clockwise.

-print=(yes|no)
    Enable or disable printing the DjVu document. Printing is enabled by default.

-save=(yes|no)
    Enable or disable saving the DjVu document. Saving is enabled by default.

-passive
    Cause the DjVu image to be displayed in a manner similar to an ordinary web image. The default zoom factor is changed to page. The toolbar, the status bar, the scrollbars, the menus, and the keyboard shortcuts are disabled.

-passivestretch
    Cause the DjVu image to be displayed in a manner similar to an ordinary web image. The default zoom factor is changed to stretch. The toolbar, the status bar, the scrollbars, the menus, and the keyboard shortcuts are disabled.

-nomenu, -notoolbar, -noscrollbars
    These options were recognized by some versions of the DjVu viewers and are honored for the sake of backward compatibility. A warning message is printed when option -verbose is active.

-logo, -textsel, -search
    These options were recognized by some versions of the DjVu viewers but are currently not implemented by djview4. A warning message is printed when option -verbose is active.

USAGE
Most features can be accessed using the menus, the toolbar, the side bar or the pop-up menu shown when the right mouse button is depressed over a DjVu image. Detailled help can be accessed by clicking the contextual help icon from the toolbar and then clicking on various section of the djview user interface. The following table lists some useful key combinations recognized when the djvu document is active:

1,2, and 3 | Change zoom to to 100%, 200% and 300%.
Up, Down, Left, Right | Scroll the image in the given direction.
Home | Display top left corner of the image.
End | Display bottom right corner of the image.
Control+Home | Go to the beginning of the document.
Control+End | Go to the end of the document.
Space, Return | Scroll down or go to next page.
Backspace | Scroll up or go to previous page.
Page Down | Go to the next page.
Page Up | Go to the previous page.
+, - | Zoom in and out.
[, ] | Rotate image.
W | Select the "Fit Width" zooming mode.
P | Select the "Fit Page" zooming mode.
CTRL+F, F3 | Search the hidden text layer.
CTRL+G | Go to a specific page by name or by number.

Handy effects can be achieved by holding modifier keys. Although these keys are configurable from the preference dialog, the following table lists the default assignments

CTRL | Hold this key to select an area with the mouse.
SHIFT | Hold this key to display all hyperlinks.

ENVIRONMENT
Setting environment variable DJVIEW_VERBOSE to a nonzero value is equivalent to calling djview with option -verbose. Setting environment variable DJVIEW_OPENGL to values 0 or 1 overrides the preference settings regarding OpenGL rendering. When the user clicks on a djvu hyperlink pointing to a web page, the program first tries to execute the web browser programs whose names are listed in the colon separated environment variable BROWSER, then tries sensible platform dependent defaults. The user interface language is determined by first trying to find a complete set of translation files for the language specified in the preference dialog, then for the ISO 639 languages specified in the colon separated environment variable LANGUAGE, and finally the language specified by the system locale. If all these searches fail, the user interface language reverts to the english default.

CREDITS
This program was written by Léon Bottou <leonb@users.sf.net> and is distributed under the GNU General Public License. This program includes code derived from program tiff2pdf, written by Ross Finlayson and released under a BSD license.

SEE ALSO
djvu(1), ddjvu(1), nsdejavu(1), tiff2pdf(1)