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Next: <a href="tkerror.html#tkerror" accesskey="n" rel="next">tkerror</a>, Previous: <a href="send.html#send" accesskey="p" rel="prev">send</a>, Up: <a href="Control.html#Control" accesskey="u" rel="up">Control</a> [<a href="wm.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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<h3 class="section">3.19 tk</h3>
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<p>tk \- Manipulate Tk internal state
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</p><a name="Synopsis-32"></a>
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<h4 class="unnumberedsubsec">Synopsis</h4>
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<p><b>tk</b><span class="roman"> </span><i>option </i><span class="roman">?</span><i>arg arg ...</i>?
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<a name="Description-30"></a>
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<h4 class="unnumberedsubsec">Description</h4>
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<p>The <b>tk</b> command provides access to miscellaneous
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elements of Tk’s internal state.
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Most of the information manipulated by this command pertains to the
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application as a whole, or to a screen or display, rather than to a
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The command can take any of a number of different forms
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depending on the <i>option</i> argument. The legal forms are:
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<dl compact="compact">
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<dt><b>tk :colormodel </b><i>window</i><span class="roman"> ?</span><i>newValue</i>?</dt>
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<dd><p>If <i>newValue</i> isn’t specified, this command returns the current
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color model in use for <i>window</i>’s screen, which will be either
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<b>color</b><span class="roman"> or </span><b>monochrome</b>.
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If <i>newValue</i><span class="roman"> is specified, then it must be either </span><b>color</b>
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or <b>monochrome</b> or an abbreviation of one of them;
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the color model for <i>window</i>’s screen is set to this value.
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<p>The color model is used by Tk and its widgets to determine whether
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it should display in black and white only or use colors.
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A single color model is shared by all of the windows managed by one
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process on a given screen.
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The color model for a screen is set initially by Tk to <b>monochrome</b>
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if the display has four or fewer bit planes and to <b>color</b> otherwise.
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The color model will automatically be changed from <b>color</b> to
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<b>monochrome</b> if Tk fails to allocate a color because all entries
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in the colormap were in use.
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An application can change its own color model at any time (e.g. it
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might change the model to <b>monochrome</b> in order to conserve
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colormap entries, or it might set the model to <b>color</b>
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to use color on a four-bit display in special circumstances), but
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an application is not allowed to change the color model to <b>color</b>
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unless the screen has at least two bit planes.
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<a name="Keywords-33"></a>
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<h4 class="unnumberedsubsec">Keywords</h4>
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<p>color model, internal state
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