Adobe Illustrator CC 2015 - Manual (Page 101)

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Drawing
Last updated 6/5/2015
Objects that are pixel-aligned, but do not have any straight vertical or horizontal segments, are not modified to align to
the pixel grid. For example, because a rotated rectangle does not have straight vertical or horizontal segments, it is not
nudged to produce crisp paths, when the pixel-aligned property is set for it.
Note: The document level property and pixel-aligned status of each object are saved in the .ai file.
For more information on aligning symbols to pixel grid, see Aligning symbols to pixel grid .
Aligning existing objects to pixel grid
An object with the Align to Pixel Grid option selected, is nudged to align to pixel grid whenever it is modified. For
example, if you move or transform a pixel-aligned object, the object is realigned to pixel grid according to its new
coordinates.
To align an existing object to pixel grid, select the object and check the Align to Pixel Grid check box at the bottom on
the Transform panel.
When you select this option, the vertical and horizontal segments of the paths of the object are nudged. As a result, the
appearance of such segments always shows crisp strokes, for all stroke widths and all locations. Objects with this option
selected, always have stroke widths in full integer values.
Bringing non-aligned objects into documents with the Align New Objects to Pixel Grid option enabled, does not
automatically pixel-align such objects. To make such objects pixel-aligned, select the object and then select the Align
to Pixel Grid option from the Transform panel. You cannot pixel-align objects such as rasters, raster effects, and text
objects because such objects do not have real paths.
Selecting objects not aligned to pixel grid
Click Select > Object > Not Aligned to Pixel Grid to select the objects.
Aligning symbols to pixel grid
To create a pixel-aligned symbol, select the Align to Pixel Grid option from the Symbol Options dialog box. Symbols
aligned to pixel grid remain aligned to the pixel grid at all locations of the artboard, in their actual size.
Note: A scaled symbol may not produce crisp paths although it is pixel-aligned by property.
For more information on aligning to pixel grid, see Drawing pixel-aligned paths for web workflows .
If the Reset button in the Control panel is active, it implies that the symbol has been transformed and is not in its actual
size.
Viewing the pixel grid
To view the pixel grid, zoom to 600% or higher in Pixel Preview mode.
To set the preferences for viewing pixel grid, click Preferences> Guides & Grid. Select the Show Pixel Grid (Above 600%
Zoom) option if it is not already selected.