Introduction to the Quick Mask Mode

This is an important tutorial because it is introducing you to the quick mask.

The quick mask is a powerful way to get great selections accurately

and it's very flexible.  First start off with the lasso tool

and make a very loose selection around an object

Now that you have made a selection, you can view it at any time (and do

further editing) in the quick mask mode. To enter the quick mask mode

press the icon as shown right here (you can also toggle between regular

and quick mask modes with the 'Q' keyboard shortcut).

When you enter the quick mask mode you get a rubylith. This shows that

areas that are de-selected in Red and the areas that are selected as

untouched or clear. 

You can further edit your selection in process (the quick mask becomes

a temporary channel in the Channels palette and is gone when you exit

the mode) by a number of ways including selection and filling (combined),

gradient and using the brush tool (most common). Select the brush tool

while you are in quick mask mode.

You can change the size of your brush in the brush dialog box in the options bar. Basically what you're going to do is 'paint in' the areas that you want to deselect.

In order to do this you also have to understand that black must be the

foreground color in order to paint in red (don't let this confuse you...if the

rubylith was black you wouldn't see anything) to deselect. To RESELECT

you use white as your foreground color with the paintbrush. This is a very

important concept I refer to often:

Black hides pixels. White buys them back. 

It could take you a long time to get comfortable with this in an

operational proficiency.

Also, when you choose any shade between white and black you will get

different levels of opacity in the resulting selection. The closer to black

you are the more invisible the pixels and the closer to white the shade

of grey, the more visible the pixels will be.

White is pure original pixels ("buys back" your pixels)

and black is pure hidden (masked) or invisible. 

  Because the quick mask is essentially a grayscale alpha channel, no

other colors are involved, just white to black and shades of grey in

between. These are what you will ‘paint' with in order to select or

deselect. Now just take your brush with black as the foreground

color and fill in the rest of the sky carefully.

The rubylith just shows you the actual job that you are doing. Feel free

to lower the size of the brush to get into smaller areas (use the bracket

keys [ ] to make the brush size larger or smaller).

If you accidentally (or purposefully) spillover and deselect an area with red

use the shortcuts of D,X to switch and get white as your new foreground

color. With white remember you are buying back pixels, or preserving them

in the ultimate selection, so just eraser the red rubylith to where it spills over

into your mountain or selection object.

It might take a few minutes depending on the type of selection job and

complexity (even for pro's) but learning this 'quick mask' method is really

a time saver. Try using the rectangular marquee to get a selection like this (yikes).

Remember that you can also combine other selection tools and you can use

the gradient tool, making selections in the quick mask mode and then filling

with either white or black or your shade of grey.

You can also enter the quick mask mode from scratch without first making any selection (not recommended) and then you can use a large brush to just start deselecting areas to close in around your selection with black as your foreground color.

Press the Edit in standard mode button

or Q to exit quick mask, delete the temporary channel (which will return

once you enter again) and see the selection job that you have created.

You can always enter quick mask mode again to keep working on or editing your selection. I much prefer the quick mask mode personally than to edit selections by making them into work paths and using pen editing tools. With the brushes it usually gets a great selection every time with nice clean edges.

Here is the view of the quick mask mode in the Channels palette where

the temporary channel (alpha) is created. Note that the black area is

deselected and the white area is the ‘selected' portion. The rubylith

simply allows you to view your selection job in progress.
 

Remember that you can also right click in standard mode (with selection

tools such as the marquee...) to choose make work path. This is covered

in another tutorial and is another (harder) way of editing your selections/paths.

By using brushes instead of a shaky lasso tool you can have a lot more

control over the selection and ultimately, the extraction that you're getting. 

This means if you're extracting an object, person, mountain, animal (or most

anything) you can get it faster and more precise with cleaner lines to then

move it to where you want it and do with it what you have planned.

You'll really want to get really good at getting selections so you can move

your people, subjects, main characters, etc. where you want to in a design

or photograph.

To fully master the quick mask mode will take some more education

as well as some application on your part but it can be a GREAT tool

in your arsenal of getting fast and accurate selections. 

There are just a million more little things like this that you could learn that

you won't find on other online tutorials. 

I want you to think about where you're at and what you want to get out

of Photoshop.  Do you feel limited by the free information you've been

presented with online so far?  Do you know it's only part of the scope of

your potential?

On the next page I'm going to show you how you can achieve digital imaging

editing results in any area that you might be interested in.  I'm talking

about the Photoshop results of your dreams and without limitations.

Getting what you want out of Photoshop CS/CS2>>

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