maxrjones
/
gmt-fork
mirror of https://github.com/meghanrjones/gmt.git


  
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            The **-t** option
^^^^^^^^^^^^^^^^^

**Syntax**

**-t**\ *transp*\ [/*transp2*][**+f**\ \|\ **s**]
    Set transparency level(s) for an overlay.

**Description**

The **-t** option allows you to change the transparency level for the current overlay by appending the *transp*
percentage in the 0-100 range [default is 0 (i.e., opaque)]. Normally, *transp* applies to both fill and stroke, but you
can limit the transparency to one of them by appending **+f** or **+s** for fill or stroke, respectively. Alternatively,
append /*transp2* to set separate transparencies for fills and strokes.


Transparency may also be controlled on a feature by feature basis when setting color or fill (see the cookbook section
:ref:`-Gfill_attrib`). **Note**: The modules :doc:`/plot`, :doc:`/plot3d`, and :doc:`/text` can all change
transparency on a record-by-record basis if **-t** is given without argument and the input file supplies variable
transparencies as the last numerical column value(s). **Note**: The transparency is only visible when PDF or raster
format output is selected because the PostScript language does not support transparency. Only the PNG format selection
adds a transparency layer in the image (for further processing).