Post-processing your GitBook PDFs made easy

By default, GitBook generates very simple, clean, black-on-white PDF documents. Although one can achieve some degree of customization through styles/pdf.css and the use of book.json to provide custom headers and footers, some operations remain out of reach. For instance, one cannot set a background or foreground layers, although common use-cases include watermarking/stamping, or even simply adding a nice color/texture to the document.

This plugin allows you to perform some common post-processing operations. It features:

* [x] setting an image as background (with fill-page mode supported)
[ ] setting a colorful background (soon)*
[ ] setting a texture-based background (soon)*
[ ] performing foreground stamping (soon)*

Using the plugin

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The plugin is available from the Plugin Store under the name pdf-styling.

To activate it, while editing your book, open the Plugin Store menu and look for "pdf-styling".

Do not use the GUI configuration feature from gitbook.com. Have a look at the "Usage" section below instead for further information on how to configure and use the plugin.

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If you plan on generating PDF documents locally, you should add pdf-styling to the plugins list in your book.json, then run gitbook install.

Some binary dependencies are bundled with the plugin:

* pdftk

You will need to have imagemagick installed locally, though.

Then, have a look at the "Usage" section below for further information on how to configure and use the plugin.

Configuration

In your book.json:

`` json
{
"plugins": ["pdf-styling"],
"pluginsConfig": {
"pdf-styling": {
}
}
}
`

Usage

Simply append the configuration you need within the empty pdf-styling property.

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` json
"pdf-styling": {
"background": {
"image": "path/to/image.ext"
}
}
`

You must provide a valid path with the image property (there is no default value). The path is relative to your GitBook project.

#### Position

The image will be centered by default. You can specify the position by setting an aptly named position property:

` json
"pdf-styling": {
"background": {
"image": "path/to/image.ext",
"position": "northwest"
}
}
`

Available positions: center (default), north, northeast, east, southeast, south, southwest, west, northwest.

#### Offsets

Depending on the position, you may specify horizontal and/or vertical offsets. For instance, the northwest position allows for both directions to be set, whereas the north position only allows for the vertical one. The "center" position is not affected by offsets. Think of offsetting as "unsticking from an edge or corner".

You can provide either one or two values:

` js
"20x50" // 20pt offset on the horizontal axis, 50pt offset on the vertical axis.
"10" // 10pt offset on both directions.
`

` js
"0x50" // Fits "north" or "south" positions.
"50x0" // Fits "west" and "east" positions.
"10" // Fits any corner position ("northwest", "northeast", etc.)
"20x70" // Fits any corner position.
`

An example configuration could then look like this:

` json
"pdf-styling": {
"background": {
"image": "path/to/image.ext",
"position": "northwest",
"offset": "10x20"
}
}
`

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You can have your image filling the whole page by enabling the fill property:

` json
"pdf-styling": {
"background": {
"image": "path/to/image.ext",
"fill": true
}
}
`

Note: all specified properties but image will be ignored in fill mode.

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You can use a solid color background by fulfilling fill with a color-ish value
which can be an hexadecimal color code
, or a X11-compliant color name.

Using an hexadecimal color:

` json
"pdf-styling": {
"background": {
"fill": "#257896"
}
}
`

Using a X11 name:

` json
"pdf-styling": {
"background": {
"fill": "wheat"
}
}
`

*Note: when fill is set to a color code or name, any specified image
property will be ignored.*

#### Opacity

When using an hexadecimal color code, you may specify the opacity of the color
(a number between 0 and 1):

` json
"pdf-styling": {
"background": {
"fill": "wheat",
"opacity": "0.65"
}
}
``

*Note: this option is not supported for X11 color names yet".