Quick links to procedures on this page:
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When you convert a vector graphic to a bitmap, you can apply special effects that are unavailable for vector graphics or objects. The process of converting a vector graphic to a bitmap is also known as “rasterizing.”
When you convert the vector graphic, you can select the color mode of the bitmap. A color mode determines the number and kind of colors that make up the bitmap, so the file size is also affected. For more information about color modes, see Changing the color mode of bitmaps.
You can also specify settings for such controls as dithering, anti-aliasing, overprinting black, and background transparency.
When you export a file to a bitmap file format, such as TIFF, JPEG, CPT, or PSD, the same bitmap conversion options are available. For more information about exporting, see Exporting files.
| To convert a vector graphic to a bitmap | |
1. |
Select an object.
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2. |
Click Bitmaps  Convert to bitmap.
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3. |
Choose a resolution from the Resolution list box.
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4. |
Choose a color mode from the Color mode list box.
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Enable any of the following check boxes:
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Dithered — simulates a greater number of colors than those available. This
option is available for images that use 256 or fewer colors.
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Always overprint black — overprints black when black is the top color.
Enabling this option prevents gaps from appearing between black objects and
underlying objects when you print bitmaps.
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Anti-aliasing — smooths the edges of the bitmap
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Transparent background — makes the background of the bitmap transparent
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You can change the black threshold for the Always overprint black option.
For information about setting the black threshold, see To set the overprint
black threshold.
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If you export a vector file to a bitmap format, such as GIF, you are prompted
to set the bitmap conversion options described in the procedure above before
you export the file.
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Making the background of a bitmap transparent lets you see images or a
background otherwise obscured by the bitmap background.
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| To convert a vector graphic to a bitmap when exporting | |
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Click File Export.
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2. |
Choose the folder where you want to save the file.
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Choose a bitmap file format from the Save as type list box, and type a filename in
the File name list box.
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Set the options you want, and click Export.
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In the Convert to bitmap dialog box, type values in one of the following pairs of
boxes:
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Width and Height — let you specify the image dimensions
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Width % and Height % — let you resize the image to a percentage of its
original size
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To specify the resolution, type a value in the Resolution box.
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Choose a color mode from the Color mode list box.
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8. |
Enable any of the following check boxes:
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Dithered — simulates a greater number of colors than those available. This
option is available for images that use 256 or fewer colors.
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Always overprint black — overprints black when black is the top color.
Enabling this option when you print bitmaps prevents gaps from appearing
between black objects and underlying objects.
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In the Options area, enable any of the following:
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Anti-aliasing — smooths the edges of the bitmap
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Maintain layers — preserves layers
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Transparent background — makes the background of the bitmap transparent
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You can change the black threshold for the Always overprint black option.
For information about setting the black threshold, see To set the overprint
black threshold.
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Not all options in the Convert to bitmap dialog box are available for all
bitmap file formats.
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Making the background of a bitmap transparent lets you see images or a
background otherwise obscured by the bitmap background.
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