From Window menu. Click Window to expand this menu then click Channels from list.
Mask will be saved as Alpha channel in CHANNELS panel (Window > Channels).
Color Picker and Color panel. There are and non-destructive Adjustments to mix colors: Color Balance, Channel Mixer, Selective Color.
All tools like Move tool, Brush tool, Type tool live in Toolbox or tool panel as you say. It is one of most important panels in Photoshop, you can not access tools in Photoshop from any other panel in Photoshop.
If you haven't closed the image yet, you can go to a step in your History panel before you made the change. If you have already closed the image, you cannot undo the change, as Photoshop does not save your History.Note: if the mode change was from RGB to CMYK, or vice versa, you can always convert back, however, you will never get back exactly what you had before the first conversion.
panel,
in control panel, click on add/remove programs and find Adobe Photoshop. Click on Photoshop and click change remove. This should help! :D
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You can access styles from STYLES panel or from Layer Style dialog (fx at bottom of LAYERS panel).
In terms of Photoshop the Layer panel is used to add/remove/enhance/dodge/burn the specific part of the picture, the layer panel is used to do digital correction to the image.
Prior to CS4, panels were referred to as palettes. A panel or palette is a box (usually located on the right hand side of the screen, but moveable) that allows you to change options associated with a Photoshop feature. For example, the layers panel or palette is used to manipulate layers; the character panel or palette is used to manipulate text.
Softening, you can soften edges of selection using Feather command from select > Modify > Feather or From Refine Edge dialog Select > Refine Edge. Feather also appears on Properties panel in Photoshop CS6 or Masks panel in previous versions to soften edges of pixel based or vector mask (you must select mask on Layers panel first).
You must open Animation panel from Window > Animation (Timeline in CS6).