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Both techniques work even if you undo the last application of a filter. However, if you cancel a filter in progress, pressing Ctrl+F or Ctrl+Alt+F (z -F or z -Option-F on the Mac) applies the last uncanceled filter. Nudging numerical valuesTip
In addition to entering specific numerical values in filter dialog boxes, you can nudge the values using the up and down arrow keys. When working with percentage values, press an arrow key to raise or lower the value by 1. Press Shift-up arrow or Shift-down arrow to change the value in increments of 10. Note that with some destructive filters, most notably those associated with the old Gallery Effects filters, you must use the arrow keys on the numeric keypad; the regular navigation arrow keys dont work.
If the value accommodates decimal values, its probably more sensitive to the arrow key. Press an arrow for a 0.1 change; press Shift+arrow for 1.0. Fading a filter
In many cases, you apply filters to a selection or an image at full intensity meaning that you marquee an area using a selection tool, choose a filter command, enter whatever settings you deem appropriate if a dialog box appears, and sit back and watch the fireworks.
Whats so full intensity about that? Sounds normal, right? Well, the fact is, you can reduce the intensity of the last filter applied by choosing Edit® Fade or by pressing Ctrl+Shift+F (z -Shift-F on the Mac).
This command permits you to mix the filtered image with the original, unfiltered one.
As shown in Figure 10-5, the Fade dialog box provides you with the basic tools of image mixing an Opacity value and a blend mode pop-up menu. To demonstrate the wonders of Edit® Fade, Ive applied two particularly destructive Gallery Effects filters to the woman getting a facial Filter® Stylize® Glowing Edges and Filter®Sketch® Bas Relief. The right-hand images show the effects of pressing Ctrl+Shift+F and applying two blend modes, Screen and Vivid Light, with the Opacity value set to 100 and 65
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Part III: Selections, Masks, and Filters
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Figure 10-5: Press Ctrl+Shift+F (z -Shift-F on the Mac) to mix the filtered image with the unfiltered original. I dont know about you, but Id take a Glowing Edges facial over a Bas Relief one any day.Creating layered effectsCaution
The drawback of the Fade command is that its available only immediately after you apply a filter (or perform some other applicable edit). If you so much as modify a selection outline after applying the filter, the Fade command dims, only to return when you apply the next filter.
Therefore, you may find it more helpful to copy a selection to a separate layer (by pressing Ctrl+J on the PC or z -J on the Mac) before applying a filter. This way, you can perform other operations, and even apply many filters in a row, before mixing the filtered image with the underlying original. Filtering inside a border
And heres another reason to layer before you filter: If your image has a border around it like the ones shown in Figure 10-6 you dont want Photoshop to factor the border into the filtering operation. To avoid this, select the image inside the border and press Ctrl+J (Win) or z -J (Mac) to layer it before applying the filter. The reason this works is that most filters take neighboring pixels into consideration even if they are not selected. By contrast, when a selection floats, it has no neighboring pixels, and therefore the filter affects the selected pixels
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319 Photoshop CS Bible @Team LiB
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Figure 10-6: The results of applying two sample filters to images surrounded by borders. In each case, only the image was selected; the border was not. Layering the right examples prevented the borders from affecting the performance of the filters.
Figure 10-6 shows the results of applying two filters discussed in this chapter Unsharp Mask and Motion Blur when the image is anchored in place and when its layered. In all cases, the 2-pixel border was not selected. In the left examples, the Unsharp Mask filter leaves a high-contrast residue around the edge of the image, and Motion Blur duplicates the left and right edges of the border. Both problems vanish when the filters are applied to layered images, as seen on the right.
Even if the area outside the selection is not a border per se perhaps its just a comparatively dark or light area that serves as a visual frame layering comes in handy. You should always layer the selection unless you specifically want edge pixels to be calculated by the filter.Undoing a sequence of filters Okay, heres one last reason to layer before you filter. Copying an image to a layer protects the underlying image. If you just want to experiment a little, pressing Ctrl+J (z -J on the Mac) is often more convenient than restoring a state in the History palette. After applying four or five effects to a layer, you can undo all that automated abuse by Alt-clicking (Win) or Option-clicking (Mac) the trash icon at the bottom of the Layers palette, which deletes the layer. The underlying original remains unharmed.