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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>gimpimagetransform: GIMP Library Reference Manual</title>
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<a href="#libgimp-gimpimagetransform.description" class="shortcut">Description</a></span>
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<a name="libgimp-gimpimagetransform"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libgimp-gimpimagetransform.top_of_page"></a>gimpimagetransform</span></h2>
<p>gimpimagetransform — Transformations on images.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libgimp-gimpimagetransform.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libgimp-gimpimagetransform.html#gimp-image-resize" title="gimp_image_resize ()">gimp_image_resize</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libgimp-gimpimagetransform.html#gimp-image-resize-to-layers" title="gimp_image_resize_to_layers ()">gimp_image_resize_to_layers</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libgimp-gimpimagetransform.html#gimp-image-scale" title="gimp_image_scale ()">gimp_image_scale</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libgimp-gimpimagetransform.html#gimp-image-scale-full" title="gimp_image_scale_full ()">gimp_image_scale_full</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libgimp-gimpimagetransform.html#gimp-image-crop" title="gimp_image_crop ()">gimp_image_crop</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libgimp-gimpimagetransform.html#gimp-image-flip" title="gimp_image_flip ()">gimp_image_flip</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libgimp-gimpimagetransform.html#gimp-image-rotate" title="gimp_image_rotate ()">gimp_image_rotate</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libgimp-gimpimagetransform.description"></a><h2>Description</h2>
<p>Operations to scale, resize, crop, flip and rotate images.</p>
</div>
<div class="refsect1">
<a name="libgimp-gimpimagetransform.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gimp-image-resize"></a><h3>gimp_image_resize ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
gimp_image_resize (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>,
<em class="parameter"><code><span class="type">gint</span> new_width</code></em>,
<em class="parameter"><code><span class="type">gint</span> new_height</code></em>,
<em class="parameter"><code><span class="type">gint</span> offx</code></em>,
<em class="parameter"><code><span class="type">gint</span> offy</code></em>);</pre>
<p>Resize the image to the specified extents.</p>
<p>This procedure resizes the image so that it's new width and height
are equal to the supplied parameters. Offsets are also provided
which describe the position of the previous image's content. All
channels within the image are resized according to the specified
parameters; this includes the image selection mask. All layers
within the image are repositioned according to the specified
offsets.</p>
<div class="refsect3">
<a name="gimp-image-resize.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image_ID</p></td>
<td class="parameter_description"><p>The image.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>new_width</p></td>
<td class="parameter_description"><p>New image width.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>new_height</p></td>
<td class="parameter_description"><p>New image height.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offx</p></td>
<td class="parameter_description"><p>x offset between upper left corner of old and new images: (new - old).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offy</p></td>
<td class="parameter_description"><p>y offset between upper left corner of old and new images: (new - old).</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-image-resize.returns"></a><h4>Returns</h4>
<p> TRUE on success.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-image-resize-to-layers"></a><h3>gimp_image_resize_to_layers ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
gimp_image_resize_to_layers (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);</pre>
<p>Resize the image to fit all layers.</p>
<p>This procedure resizes the image to the bounding box of all layers
of the image. All channels within the image are resized to the new
size; this includes the image selection mask. All layers within the
image are repositioned to the new image area.</p>
<div class="refsect3">
<a name="gimp-image-resize-to-layers.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image_ID</p></td>
<td class="parameter_description"><p>The image.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-image-resize-to-layers.returns"></a><h4>Returns</h4>
<p> TRUE on success.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-2.html#api-index-2.2">2.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gimp-image-scale"></a><h3>gimp_image_scale ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
gimp_image_scale (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>,
<em class="parameter"><code><span class="type">gint</span> new_width</code></em>,
<em class="parameter"><code><span class="type">gint</span> new_height</code></em>);</pre>
<p>Scale the image using the default interpolation method.</p>
<p>This procedure scales the image so that its new width and height are
equal to the supplied parameters. All layers and channels within the
image are scaled according to the specified parameters; this
includes the image selection mask. The interpolation method used can
be set with <a class="link" href="libgimp-gimpcontext.html#gimp-context-set-interpolation" title="gimp_context_set_interpolation ()"><code class="function">gimp_context_set_interpolation()</code></a>.</p>
<div class="refsect3">
<a name="gimp-image-scale.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image_ID</p></td>
<td class="parameter_description"><p>The image.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>new_width</p></td>
<td class="parameter_description"><p>New image width.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>new_height</p></td>
<td class="parameter_description"><p>New image height.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-image-scale.returns"></a><h4>Returns</h4>
<p> TRUE on success.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-image-scale-full"></a><h3>gimp_image_scale_full ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
gimp_image_scale_full (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>,
<em class="parameter"><code><span class="type">gint</span> new_width</code></em>,
<em class="parameter"><code><span class="type">gint</span> new_height</code></em>,
<em class="parameter"><code><a href="../html/libgimpbase-gimpbaseenums.html#GimpInterpolationType"><span class="type">GimpInterpolationType</span></a> interpolation</code></em>);</pre>
<div class="warning">
<p><code class="literal">gimp_image_scale_full</code> is deprecated and should not be used in newly-written code.</p>
<p>Use <a class="link" href="libgimp-gimpimagetransform.html#gimp-image-scale" title="gimp_image_scale ()"><code class="function">gimp_image_scale()</code></a> instead.</p>
</div>
<div class="refsect3">
<a name="gimp-image-scale-full.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image_ID</p></td>
<td class="parameter_description"><p>The image.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>new_width</p></td>
<td class="parameter_description"><p>New image width.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>new_height</p></td>
<td class="parameter_description"><p>New image height.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>interpolation</p></td>
<td class="parameter_description"><p>Type of interpolation.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-image-scale-full.returns"></a><h4>Returns</h4>
<p> TRUE on success.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-6.html#api-index-2.6">2.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gimp-image-crop"></a><h3>gimp_image_crop ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
gimp_image_crop (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>,
<em class="parameter"><code><span class="type">gint</span> new_width</code></em>,
<em class="parameter"><code><span class="type">gint</span> new_height</code></em>,
<em class="parameter"><code><span class="type">gint</span> offx</code></em>,
<em class="parameter"><code><span class="type">gint</span> offy</code></em>);</pre>
<p>Crop the image to the specified extents.</p>
<p>This procedure crops the image so that it's new width and height are
equal to the supplied parameters. Offsets are also provided which
describe the position of the previous image's content. All channels
and layers within the image are cropped to the new image extents;
this includes the image selection mask. If any parameters are out of
range, an error is returned.</p>
<div class="refsect3">
<a name="gimp-image-crop.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image_ID</p></td>
<td class="parameter_description"><p>The image.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>new_width</p></td>
<td class="parameter_description"><p>New image width: (0 < new_width <= width).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>new_height</p></td>
<td class="parameter_description"><p>New image height: (0 < new_height <= height).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offx</p></td>
<td class="parameter_description"><p>X offset: (0 <= offx <= (width - new_width)).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offy</p></td>
<td class="parameter_description"><p>Y offset: (0 <= offy <= (height - new_height)).</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-image-crop.returns"></a><h4>Returns</h4>
<p> TRUE on success.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-image-flip"></a><h3>gimp_image_flip ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
gimp_image_flip (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>,
<em class="parameter"><code><a href="../html/libgimpbase-gimpbaseenums.html#GimpOrientationType"><span class="type">GimpOrientationType</span></a> flip_type</code></em>);</pre>
<p>Flips the image horizontally or vertically.</p>
<p>This procedure flips (mirrors) the image.</p>
<div class="refsect3">
<a name="gimp-image-flip.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image_ID</p></td>
<td class="parameter_description"><p>The image.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>flip_type</p></td>
<td class="parameter_description"><p>Type of flip.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-image-flip.returns"></a><h4>Returns</h4>
<p> TRUE on success.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-image-rotate"></a><h3>gimp_image_rotate ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
gimp_image_rotate (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>,
<em class="parameter"><code><a href="../html/libgimpbase-gimpbaseenums.html#GimpRotationType"><span class="type">GimpRotationType</span></a> rotate_type</code></em>);</pre>
<p>Rotates the image by the specified degrees.</p>
<p>This procedure rotates the image.</p>
<div class="refsect3">
<a name="gimp-image-rotate.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image_ID</p></td>
<td class="parameter_description"><p>The image.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>rotate_type</p></td>
<td class="parameter_description"><p>Angle of rotation.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-image-rotate.returns"></a><h4>Returns</h4>
<p> TRUE on success.</p>
</div>
</div>
</div>
</div>
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