Adobe 13101332 - Photoshop - Mac User Manual page 324

Adobe Photoshop Help
Using Help | Contents
Apply filters to individual channels You can apply a filter to an individual channel,
apply a different effect to each color channel, or apply the same filter but with different
settings.
Create backgrounds By applying effects to solid-color or grayscale shapes, you can
generate a variety of backgrounds and textures. You might then blur these textures.
Although some filters have little or no visible effect when applied to solid colors (for
example, Glass), others produce interesting effects. You might try Add Noise, Chalk &
Charcoal, Clouds, Conté Crayon, Craquelure, Difference Clouds, Glass, Grain, Graphic Pen,
Halftone Pattern, Mezzotint, Mosaic Tiles, Note Paper, Patchwork, Pointillize, Reticulation,
Rough Pastels, Sponge, Stained Glass, Texture Fill, Texturizer, and Underpainting.
Combine multiple effects with masks or with duplicate images Using masks to create
selection areas gives you more control over transitions from one effect to another. For
example, you can filter the selection created with a mask.
You can also use the history brush tool to paint a filter effect onto part of the image.
First, apply the filter to an entire image. Next, step back in the History palette to the image
state before the filter was applied, and set the history brush source to the filtered state.
Then, paint the image. (See
Improve image quality and consistency You can disguise faults, alter or enhance, or
make a series of images look related by applying the same effect to each. Use the Actions
palette to record the process of modifying one image, and then use this action on the
other images. (See "Using the Actions palette" on page
Improving performance with filters
Some filter effects can be memory intensive, especially when applied to a high-resolution
image. You can use these techniques to improve performance:
Try out filters and settings on a small portion of an image.
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Apply the effect to individual channels—for example, to each RGB channel—if the
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image is large and you're having problems with insufficient memory. (With some filters,
effects vary if applied to the individual channel rather than the composite channel,
especially if the filter randomly modifies pixels.)
Free up memory before running the filter by using the Purge command.
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(See "Correcting mistakes" on page
Allocate more RAM to Photoshop. If necessary, exit from other applications to make
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more memory available to Photoshop.
Try changing settings to improve the speed of memory-intensive filters, such as
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Lighting Effects, Cutout, Stained Glass, Chrome, Ripple, Spatter, Sprayed Strokes, and
Glass filters. (For example, with the Stained Glass filter, increase cell size. With the
Cutout filter, increase Edge Simplicity, or decrease Edge Fidelity, or both.)
If you plan to print to a grayscale printer, convert a copy of the image to grayscale
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before applying filters. However, applying a filter to a color image and then converting
to grayscale may not have the same effect as applying the filter to a grayscale version of
the image.
Using Help | Contents
| Index
"Reverting to a previous version of an image" on page
37.)
| Index
Applying Filters for Special Effects
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