Novell SuSE Linux Professional 9.2 Upgrade [Strong Encryption 128 Bit] 00662644457260 ユーザーズマニュアル
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make manual adjustments to all channels, use the dropper tools in ‘All Channels’
to pick black, gray, and white points from the image itself.
to pick black, gray, and white points from the image itself.
To modify a channel individually, select the desired channel in ‘Modify Levels
for Channel’. Then drag the black, white, and middle markers in the slider in ‘In-
put Levels’. Alternatively, use the dropper tools to select points in the image that
should serve as the white, black, and gray points for that channel.
for Channel’. Then drag the black, white, and middle markers in the slider in ‘In-
put Levels’. Alternatively, use the dropper tools to select points in the image that
should serve as the white, black, and gray points for that channel.
If ‘Preview’ is checked, the image window shows a preview of how the image
would look with the modifications applied. When the desired result is achieved,
press ‘OK’ to apply the changes. With ‘Resest’, restore the original settings. ‘Can-
cel’ aborts level adjustment.
would look with the modifications applied. When the desired result is achieved,
press ‘OK’ to apply the changes. With ‘Resest’, restore the original settings. ‘Can-
cel’ aborts level adjustment.
20.5.5
Undoing Mistakes
Most modifications made in The GIMP can be undone. To view a history of modi-
fications, use the undo dialog included in the default window layout or open one
from the toolbox menu with ‘File’ ➝ ‘Dialogs’ ➝ ‘Undo History’.
fications, use the undo dialog included in the default window layout or open one
from the toolbox menu with ‘File’ ➝ ‘Dialogs’ ➝ ‘Undo History’.
The dialog shows a base image and a series of editing changes that can be un-
done. Use the yellow arrow at the bottom left to undo changes. Use the green ar-
row at the right to redo an undone change. In this way, you can work back to the
base image. If you undo a modification then make a new one, the undone modifi-
cation cannot be redone.
done. Use the yellow arrow at the bottom left to undo changes. Use the green ar-
row at the right to redo an undone change. In this way, you can work back to the
base image. If you undo a modification then make a new one, the undone modifi-
cation cannot be redone.
Changes can also be undone and redone with the ‘Edit’ menu. Alternatively, use
the shortcuts
the shortcuts
Ctrl
-
Z
and
Ctrl
-
Y
.
20.6
Editing Images: Advanced Features
20.6.1
Layers
Layers are a very important aspect of The GIMP. By drawing parts of your image
on separate layers, change, move, or delete those parts without damaging the rest
of the image. To understand how layers work, imagine an image created from a
stack of transparent sheets. Different parts of the image are drawn on different
sheets. The stack can be rearranged, changing which parts are on top. Individ-
ual layers or groups of layers can shift position, moving sections of the image to
other locations. New sheets can be added and others set aside.
on separate layers, change, move, or delete those parts without damaging the rest
of the image. To understand how layers work, imagine an image created from a
stack of transparent sheets. Different parts of the image are drawn on different
sheets. The stack can be rearranged, changing which parts are on top. Individ-
ual layers or groups of layers can shift position, moving sections of the image to
other locations. New sheets can be added and others set aside.
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20.6. Editing Images: Advanced Features