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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.
Apply the effect to individual channels—for example to each RGB channel—if the 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.
(See “Correcting mistakes on section 37
Allocate more RAM to Photoshop If necessary exit from other applications to make more memory available to Photoshop.
Try changing settings to improve the speed of memory-intensive ﬁlters such as 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 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.
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