How to Grayscale an Image in Illustrator
When you're creating an Adobe Illustrator document for use in print, it's important to make sure that the illustration will look the way you intend when it’s printed. If you're printing in color, Adobe has a variety of color settings to ensure that the printed output matches the color displayed on your monitor when you create the document. When printing to a monochrome printer, convert your illustration to grayscale to accurately match the display output to the printed output.
Instructions
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Open Adobe Illustrator. Click “File” and then “New” to create a new Illustrator document, or “File” and then “Open” to load an existing illustration.
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Press and hold the “Ctrl” key and press “A” to highlight all objects in the document. The border of each object will be highlighted with sizing handles in the corners.
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Click “Edit” and click “Edit Colors.” Click “Convert to Grayscale.”
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Tips & Warnings
For more control over the levels of gray in your grayscale illustration, press “Ctrl + A” to select the objects in the document, and then click “Edit” and “Edit Colors.” Click “Adjust Color Balance” and set the Color Mode drop-down menu to Grayscale. Click the “Preview” and “Convert” check boxes and use the Black slider to adjust grayscale levels. Click “OK” when you're satisfied with the levels.