68 lines
2.5 KiB
ReStructuredText
68 lines
2.5 KiB
ReStructuredText
.. _doc_exporting_images:
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Exporting images
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================
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It is often desired to do an operation to all or a group of images upon
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export. Godot provides some tools for this. Examples of such operations
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are:
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- Converting all images from a lossless format to a lossy one (ie: png
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-> web) for greater compression.
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- Shrinking all images to half the size, to create a low resolution
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build for smaller screens.
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- Create an atlas for a group of images and crop them, for higher
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performance and less memory usage.
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Image export options
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--------------------
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In the "Export Dialog", go to the Images tab:
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.. image:: /img/exportimages.png
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In this dialog the image extensions for conversion can be selected, and
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operations can be performed that apply to all images (except those in
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groups -next section for that-):
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- **Convert Image Format**: Probably the most useful operation is to
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convert to Lossy (WebP) to save disk space. For lossy, a Quality bar
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can set the quality/vs size ratio.
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- **Shrink**: This allows to shrink all images by a given amount. It's
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useful to export a game to half or less resolution for special
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devices.
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- **Compress Formats**: Allows to select which image exensions to
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convert.
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On export, Godot will perform the desired operation. The first export
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might be really slow, but subsequent exports will be fast, as the
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converted images will be cached.
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Image group export options
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--------------------------
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This section is similar to the previous one, except it can operate on a
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selected group of images. When a image is in a group, the settings from
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the global export options are overridden by the ones from the group. An
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image can only be in one group at the same time. So if the image is in
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another group different to the current one being edited, it will not be
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selectable.
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.. image:: /img/imagegroup.png
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Atlas
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~~~~~
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As a plus, an atlas can be created from a group. When this mode is
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active, a button to preview the resulting atlas becomes available. Make
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sure that atlases don't become too big, as some hardware will not
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support textures bigger than 2048x2048 pixels. If this happens, just
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create another atlas.
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The atlas can be useful to speed up drawing of some scenes, as state
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changes are minimized when drawing from it (through unlike other
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engines, Godot is designed so state changes do not affect it as much).
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Textures added to an atlas get cropped (empty spaces around the image
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are removed), so this is another reason to use them (save space). If
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unsure, though, just leave that option disabled.
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