■ Is an invisible layer selected, such as a text layer? Are you trying to edit the
wrong layer? Only the active layer can be edited, but it is possible for the
active layer to be invisible, so your edits are happening but you can’t see
them! Be sure that you have the desired layer active and that it is visible.
■ Are you trying to edit a channel or mask that isn’t visible or isn’t active? It is
possible for the active channel to be invisible, so your edits are happening
but you can’t see them happening. Be sure that the channel you want to edit
is active and visible. Also, you might have the right channel, but you might
be working in the wrong layer.A Command Is Grayed Out or Is Missing from the Menu
Some commands are not available at certain times. For example, when an adjust-
ment layer is active, many menu options are grayed out or dimmed. They become
available only when an image layer is active. Problems like this are best solved by
reading the software manual.I Can’t Save My File
Are you trying to save a file but can’t?
■ You might be trying to save the file in a format that won’t accept the features
in your image. For example, you can’t save a layered image in JPEG format.
■ You might be trying to save the file to a disk that can’t accept new files, such
as a locked disk or a CD-ROM.The Absolute Minimum
Channels are a more advanced selection and editing tool than layers. Most begin-
ners do not need to use channels for simple editing and adjustment to images.
■ Alpha channels are merely storage areas for masks.
■ To turn a mask into a selection, Ctrl+click on the channel name or select
Selection, Load Selection.
■ Channel names in italicsare adjustment layer masks, not alpha channels. Do
not delete them.
■ If something doesn’t work, make sure a selection isn’t hidden. Press Ctrl+H to
unhide the selection marquee.
■ Still stumped as to why a command won’t work? Make sure you don’t have
the wrong layer selected, such as a text layer.266 ABSOLUTE BEGINNER’S GUIDE TODIGITAL PHOTOGRAPHY