Placed Art Tips
Original Publication Date: 1993-Dec-15
Included in the Prior Art Database: 2005-Sep-19
Software Patent Institute
Adobe Systems Inc.: AUTHOR [+2]
Adobe Illustrator ™ lets you place images created in other applications within your artwork. Placed images must be in EPS format. In Adobe Illustrator, placed images act as filled objects. You can rotate, shear, and scale the images, or draw on them. You cannot, however, alter the art-work within a placed image itself. This technical note discusses considerations when using placed art in Adobe Illustrator.
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Placed Art Tips
Tech Note #4002 (12/15/93)Adobe Illustrator TM - Macintosh ®
Adobe Illustrator TM lets you place images created in other applications within your artwork. Placed images must be in EPS format. In Adobe Illustrator, placed images act as filled objects. You can rotate, shear, and scale the images, or draw on them. You cannot, however, alter the art-work within a placed image itself. This technical note discusses considerations when using placed art in Adobe Illustrator.
If the placed image was created in a pixel-based (or bitmapped) application, such as Adobe Photoshop TM , the resolution is set in the original application. You do not have the ability to change the image independent of the resolution, as you can with vector-based Adobe Illustrator images.
Here is an example of what happens when you edit a resolutiondependent image. When you scale up (enlarge) a pixel-based image, you spread existing pixels across a larger area and thus lower the resolution. For example, a 1-inch by 1-inch file at 100 pixels per inch (ppi) scaled up to 200-percent (to 2-inches by 2 inches) results in a 50-ppi image in Adobe Illustrator. The reverse is true if you scale down a pixel-based image: the resolution increases. It is a good idea to import your placed image into Adobe Illustrator at its final size and resolution. If necessary, use Adobe Illustrator to position, rotate, and skew the image.
To determine the best resolution to use in the original application, use the line screen frequency, specified as lines per inch (lpi), of your final output device. The image resolution in the original application should be approximately two times the lpi of the halftone screen you want to use. For example, a 300-dpi laser printer can produce a halftone screen of 53 lpi, so the resolution of the pixel-based image should be 106 ppi; a high-resolution imagesetter at 2540 dpi can produce a halftone screen at 150 lpi, so the resolution of the pixel-based image should be 300 ppi; and so on.Using higher resolutions than necessary does not improve the image quality and may slow printing.
Note: Please consult your printer manufacturers documentation to determine what halftone screens your output device can achieve. If you are only printing a proof to the LaserWriter, and will later be printing to a higher lpi device, use the resolution appropriate for the higher device.
CONVERTING TO CMYK COLOR MODE
Before placing color Adobe Photoshop images in Adobe Illustrator, be sure to convert them to CMYK mode first if you plan to produce color separations (through Adobe Separator TM ,
QuarkXPress ® , Aldus PageMaker ® , and so on). If you place a color image from Adob...