In CS5, when tracing a web-optimized image, such as a JPEG that is 72ppi, it traced the “stairstepped” edge.Also, you can use the touch-up tools in Photoshop to remove unwanted content before tracing. In some cases, this can make it easier for Illustrator to determine what is what (where edges are, etc.). Sometimes I will increase the contrast in an image to be traced, almost to the point of not looking right (too much contrast). You can “clean up” an image in a program such as Photoshop before tracing.An Image Tracing object that has been expanded will, more often than not, be smaller in file size than the non-expanded Image Tracing object.In other words, you can’t edit the option in the Image Trace panel for that content after expanding.
Expanding an Image Tracing object commits you to the tracing settings.If you place an image and link to it (when placing), trace it, then expand it, the raster image that is traced is no longer linked to the original and cannot be updated directly.You can click the Expand button in the Control panel or choose Object > Image Trace > Expand to expand to shapes. That also means that the highlight on the apple that is pure white will wind up being a hole, or area with no shape.Īfter you finish tracing, you can either choose to leave the vector content as an Image Tracing object, which means you can’t directly edit the vector shapes, or you can expand the tracing results and turn the Image Tracing object into a group of vector objects (shapes and/or pathsdepending on the options set). In other words, for the apple image you’ve seen in this article, the white background will not be a shape and will be transparent. Any pixel data that is white in the resulting vector data will not be included. Lastly, the Ignore White selection towards the bottom of the Image Trace panel can save you some time. Figure 15 A logo without Snap Curves To Lines selected (left), and with Snap Curves To Lines selected (right)
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