背景

Question

似乎没有办法显示由裁剪、修剪和出血偏移设置定义的各个框。使用页面背景层，可以根据印刷厂的规格直观地描绘不同的区域。

% Page Specifications (in inches, width x height)

% Exported PDF: 11.875 x 12.000
% Page size: 11.75 x 11.75
% Bleed (top, bottom, outside edges): 0.125
% Margin inset (top, bottom, outside edges): 0.25
% Margin gutter (binding edge): 0.625

\setuppagenumbering[alternative=doublesided]

% Set these to the final PDF export size.
\newdimen\BookExportWidth
\BookExportWidth=11.875in
\newdimen\BookExportHeight
\BookExportHeight=12.000in

\newdimen\BookPageWidth
\BookPageWidth=11.75in
\newdimen\BookPageHeight
\BookPageHeight=11.75in

% Safe area for text falls between the margins.
\newdimen\BookPageMargin
\BookPageMargin=.25in

% Areas outside the safe text area that may be cropped.
\newdimen\BookPageBleed
\BookPageBleed=.125in

% The inside margin differs from the outside margins.
\newdimen\BookPageMarginGutter
\BookPageMarginGutter=.625in

每个区域都有自己的颜色：

% Shows as a light red border.
\definecolor[BookDiagnosticBleed][r=1, t=.075, a=0]

% Shows as a purple border.
\definecolor[BookDiagnosticPage][b=1, t=.075, a=0]

% Shows as a gray region.
\definecolor[BookDiagnosticText][g=1, t=.075, a=0]

配置各种区域布局的计算：

\newdimen\BookPageMarginBleed
\BookPageMarginBleed=\the\dimexpr \BookPageMargin + \BookPageBleed \relax

\newdimen\BookPageWidthSafe
\BookPageWidthSafe=\the\dimexpr \BookPageWidth - \BookPageMarginGutter - \BookPageMargin \relax

\newdimen\BookPageHeightMargin
\BookPageHeightMargin=\the\dimexpr \BookPageHeight - \BookPageMargin - 2 \BookPageBleed \relax

\newdimen\BookPageBleedWidth
\BookPageBleedWidth=\the\dimexpr \BookPageWidth + \BookPageBleed \relax
\newdimen\BookPageBleedHeight
\BookPageBleedHeight=\the\dimexpr \BookPageHeight + 2 \BookPageBleed \relax

纸张尺寸定义对于显示裁剪标记必不可少。此处，“导出尺寸”相当于“媒体尺寸”。分别将\BookExportWidth和的值更改\BookExportHeight为大于\BookPageBleedWidth和的值\BookPageBleedHeight将允许显示裁剪标记。

\definepapersize[BookExportSize][
  width=\BookExportWidth,
  height=\BookExportHeight,
]

\definepapersize[BookPageSizeBleed][
  width=\BookPageBleedWidth,
  height=\BookPageBleedHeight,
]

\definepapersize[BookPageSize][
  width=\BookPageWidth,
  height=\BookPageHeight,
]

\setuppapersize[BookPageSizeBleed][BookPageSize, BookExportSize]

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Define the safe area for text. These measurements take into consideration
% bleed and safe margins. The calculations are for a two-page spread.
%
% Always define the layout for a right-hand page.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setuplayout[
  grid=yes,
  location=middle,
  rightmargin=\zeropoint,
  leftmargin=\zeropoint,
  header=\zeropoint,
  footer=\zeropoint,
  width=\BookPageWidthSafe,
  height=middle,
  topspace=\BookPageMarginBleed,
  backspace=\BookPageMarginGutter,
  marking=on,
]

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Define a layer that represents the bleed area.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\definelayer[BookLayerBleed][
  state=repeat,
]

\setlayerframed[BookLayerBleed][
  frame=off,
  background=color,
  backgroundcolor=BookDiagnosticBleed,
  offset=\zeropoint,
  overlay=\zeropoint,
  width=\BookPageBleedWidth,
  height=\BookPageBleedHeight,
]{}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Define a layer that indicates where content may go. Images within this
% area may be affected slightly when the physical page is trimmed. Content
% meant to extend to the edge of the page must overrun into the bleed area
% (above). Ensure critical details are fully within the text region (below).
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\definelayer[BookLayerPageRight][
  state=repeat,
]

\setlayerframed[BookLayerPageRight][
  frame=off,
  background=color,
  backgroundcolor=BookDiagnosticPage,
  offset=\zeropoint,
  overlay=\zeropoint,
  width=\BookPageWidth,
  height=\BookPageHeight,
  voffset=\BookPageBleed,
  hoffset=\zeropoint,
]{}

\definelayer[BookLayerPageLeft][
  state=repeat,
]

\setlayerframed[BookLayerPageLeft][
  frame=off,
  background=color,
  backgroundcolor=BookDiagnosticPage,
  offset=\zeropoint,
  overlay=\zeropoint,
  width=\BookPageWidth,
  height=\BookPageHeight,
  voffset=\BookPageBleed,
  hoffset=\BookPageBleed,
]{}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Define a layer that indicates the safe area for text and other content.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\definelayer[BookLayerTextRight][
  state=repeat,
]

\setlayerframed[BookLayerTextRight][
  frame=off,
  background=color,
  backgroundcolor=BookDiagnosticText,
  offset=\zeropoint,
  overlay=\zeropoint,
  width=\BookPageWidthSafe,
  height=\BookPageHeightMargin,
  voffset=\BookPageMarginBleed,
  hoffset=\BookPageMarginGutter,
]{}

\definelayer[BookLayerTextLeft][
  state=repeat,
]

\setlayerframed[BookLayerTextLeft][
  frame=off,
  background=color,
  backgroundcolor=BookDiagnosticText,
  offset=\zeropoint,
  overlay=\zeropoint,
  width=\BookPageWidthSafe,
  height=\BookPageHeightMargin,
  voffset=\BookPageMarginBleed,
  hoffset=\BookPageMarginBleed,
]{}

一个相当简单的测试页面，用于设置左/右页的背景：

\starttext
  \startbodymatter
    \setupbackgrounds[page][background=]
    Page 1
    \page
    \setupbackgrounds[rightpage][
      background={BookLayerBleed, BookLayerPageRight, BookLayerTextRight},
    ]
    \setupbackgrounds[leftpage][
      background={BookLayerBleed, BookLayerPageLeft, BookLayerTextLeft},
    ]

    \dorecurse{5} {
      \page
      \dorecurse{7}{\input lorem \input ward}
      \dorecurse{1}{\input ward}
    }
  \stopbodymatter
\stoptext

PDF 文件包含类似的左/右页：

现在我们可以直观地确认文本区域符合发布商的规范：

出血为浅红色：边距 0.125 英寸
页面为洋红色：边距 0.25 英寸加出血
文本区域为灰色：.625 英寸间距

Answer 1