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The Art of
Masking
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2 CorelDRAWX4 Insights from the Experts
Michael Cervantes
Michael Cervantes is a Corel C-Tech volunteer, CorelDRAW Certified Expert, andCertified Instructor. He graduated from the Southern Institute of Business and Technology
in Dallas, Texas. In addition to being a desktop publisher, Michael has been a freelance
graphic artist since 1989. He has published several articles about CorelDRAW and
Corel PHOTO-PAINT, and he routinely helps Corel users in the Corel newsgroups.
Michael was a contributing author to CorelDRAW 10: The Official Guideand other
publications.
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CorelDRAWX4 The art of masking 3
The art of maskingCorel PHOTO-PAINT is an extraordinary bitmap-editing application that features many tools for
masking digital images according to user convenience and needs. Some of these tools are based
on techniques used traditionally in printing, photography, and painting, while others have
come from the imaginations of software engineers. These versatile masking tools offer the
skilled user many masking techniques, some of which are so creative that their use constitutes
a form of art.
The most important and efficient Corel PHOTO-PAINT masking technique is the clip mask. What
is a clip mask, and how does it work? Imagine a transparent piece of paper placed over a
photograph. You can paint over this paper with a magic ink that adds transparency to the
underlying photograph or subtracts transparency from it. The advantage of this method is that
the ink does not dry until you are satisfied with your work, and only then do the changes
become permanent. The original image is kept intact, because you are not painting directly over
the photograph.
Why is this so fantastic? First, the technique is nondestructive; second, you can use almost all
Corel PHOTO-PAINT tools and effects while working on the mask; third, changes are displayed
immediately; and fourth, you can apply or discard the clip mask whenever you want.
The clip mask is associated with an object, which is why you should convert the background to
an object if you want to use a clip mask on it. Converting the background to an object is not a
problem, because you can combine any object or layer with the background whenevernecessary, even if the background is clip-masked.
In addition to providing useful tips about working with clip masks, this tutorial also gives you
some general tips about masking. You will learn some techniques that will help you increase
your productivity and improve the quality of your masks. Learning these methods is the first step
in improving your masking technique.
Example 1: Use masking to createtransparent edgesYou need to create soft transparent edges on three sides of an image, because the image will
be used on the interior left-hand page of a magazine.
1 Open the sample image in Corel PHOTO-PAINT (locate the file strawberries.tifin the
folder Program Files\Corel\CorelDRAW Graphics Suite X4\Tutorial files). If necessary,
choose To fit from the zoom level list box on the property bar.
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4 CorelDRAWX4 Insights from the Experts
2 Open the Objectsdocker (press Ctrl + F7, or from the menu bar, click Window
DockersObjects).
3 Convert the background to an object. To do this, click the Create an object from the
backgroundbutton at the bottom of the Objectsdocker, or from the menu bar, click
ObjectCreateFrom background.
4 Double-click the Rectangle masktool in the toolbox to create a mask around the image.
5 Click MaskMask outlineReduce, and set Widthto 50 pixels. This setting evenly
reduces the size of the mask 50 pixels from the border. This approach is faster, and more
precise, than drawing the mask and aligning it with the center of the image.
6 Right-click the object thumbnail in the Objectsdocker, and select Create clip mask
From mask, or from the menu bar, click Object Clip maskCreateFrom mask. A
clip mask icon is created to the right of the object thumbnail in the Objectsdocker. Theclip mask represents the special transparent sheet of paper mentioned previously. Notice
the red outline around the clip mask icon in the Objectsdocker (Figure 1), which tells you
that the clip mask is active. You can click the object thumbnail to deactivate the clip mask
and work directly on the image, or you can click the clip mask icon to reactivate it.
Figure 1: The red outline shows that the clip mask is active.
7 Now a magic moment: Open the Gaussian blurdialog box (from the menu bar, click
EffectsBlurGaussian blur), and play with the Radiusslider until the image borders
appear with a soft transition from solid to transparent.
8 We want to return the right side of the image to normal (hard edge) while keeping a soft
border for the other three sides. To do this, activate the Painttool (press the Pkey, or click
the Painttool in the toolbox), and select Airbrushfrom the Paint toolpicker on the
property bar. Click the Open advanced optionsbutton on the property bar to expand
the advanced options, and set brush Transparencyto 95. Set Foreground colorto white
(click the Whiteswatch on the color palette), and paint on the right side of the image. The
edges are now complete (Figure 2).
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CorelDRAWX4 The art of masking 5
9 To make the changes permanent, combine the clip mask with the object (right-click the
clip mask icon in the Objectsdocker, and select Combine clip mask, or from the menu
bar, click ObjectClip maskCombine).
Figure 2: Transparent edges are created on three sides.
Example 2: Use masking to change imageluminosityThe clip mask is useful not only for masking transparencies, but also for masking color and
correcting luminosity. Frequently, you find images that are highly contrasted or that haveshadows that cover large areas of the image. By using image luminosity to mask these types of
images, you can bring out image detail.
The process is simple: you invert the image luminosity, so that what is white changes to black,
and what is black changes to white. The black area of the mask protects the highlights, and the
white area exposes the shadows to changes and gradually exposes the rest of the image. Study
the following example to see how this works.
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6 CorelDRAWX4 Insights from the Experts
A travel agency is promoting a destination. You have been assigned to enhance the shadows
in this photograph to expose important details (Figure 3).
Figure 3: The photograph contains shadows that need to be adjusted
without affecting the highlights in the image.
1 Open the sample image with Corel PHOTO-PAINT (locate the file
seaside_village_shadows.tifin the folder Program Files\Corel\CorelDRAW Graphics
Suite X4\Tutorial files). If necessary, choose To fit from the zoom level list box on the
property bar.
2 Duplicate the image (click ImageDuplicate).
3 Convert the duplicate to Lab Color mode by clicking ImageConvert toLab color (24
bit).
4 Press Alt + 1to open the Channelsdocker and activate the Lightness channel (or from the
menu bar, click WindowDockersChannels, and then click Lightness channel).
5 Copy the Lightness channel to the Clipboard (press Ctrl + C, or from the menu bar, click
EditCopy).
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CorelDRAWX4 The art of masking 7
6 Activate the original image (click Windowseaside_village_shadows.tif).
7 Duplicate the background object by pressing Ctrl + Dor clicking ObjectDuplicatefrom
the menu bar. (You can also right-click the Backgroundobject in the Objectsdocker and
choose Duplicate selected.)
8 Rename the new object. To do this, right-click the object in the Objectsdocker, and
choose Properties. In the Object propertiesdialog box, type Enhanced in the Name
field, and click OK.
9 Activate Paint on maskmode (press Ctrl + K, or from the menu bar, click MaskPaint
on mask).
10 Paste the Lightness channel from the Clipboard into the Paint on maskimage (click
Edit PastePaste as new selection).
11 Invert the mask by clicking ImageTransformInvert. Note that the highlights are nowblack and that the shadows are white (Figure 4).
Figure 4: The highlights and shadows have been inverted.
12 Deactivate Paint on maskmode (press Ctrl + K, or from the menu bar, click MaskPaint on mask).
13 Create a clip mask on the Enhanced object by right-clicking the Enhanced thumbnail
in the Objectsdocker and choosing Create clip maskFrom mask.
Note: You can also invert a mask by right-clicking the thumbnail and choosing Create clipmaskFrom inverted mask.
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8 CorelDRAWX4 Insights from the Experts
14 Activate the Enhanced object, and deactivate the clip mask, by clicking the Enhanced
object thumbnail in the Objectsdocker.
15 Open the Tone curvedialog box (press Ctrl + T, or from the menu bar, click
Adjust Tone curve). Adjust the curve to enhance the shadows and reveal detail. You
should observe how the shadows become lighter while the highlights remain unchanged,
and how the other tones change gradually.
16 To see the changes to the Enhanced object, hide the background object by clicking the
background eye icon in the Objectsdocker (Figure 5).
Figure 5: The highlights are enhanced.
Example 3: Use channel masks to replacethe image backgroundThe perfect result of using this efficient, magical technique depends on how fast and how
precisely the initial mask is created. Corel PHOTO-PAINT beginners tend to activate the Magicwand masktool too often, and intermediate users do the same to the Pathtool, but you
should remember that masks are 8-bit channels. More often than not, the mask you are looking
for can be found inside a channel, especially complex masks that would be difficult and tedious
to create with conventional mask tools. If you want to mask like a pro fast and easy take
a good look at the following example.
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CorelDRAWX4 The art of masking 9
The sky in the image below is flat and pale (Figure 6). You want to enrich this beautiful
composition by using a different sky and adjusting the sea color slightly.
Figure 6: The sky in this photograph lacks color and contrast.
1 Open the sample image with Corel PHOTO-PAINT (locate the file
seaside_village_detail.tifin the folder Program Files\Corel\CorelDRAW Graphics Suite
X4\Tutorial files). If necessary, choose To fit from the zoom level list box on the property
bar.
2 The main color you want in the sky is cyan, and the unwanted color is yellow. If you want
to mask the sky, the channel to look at is the yellow channel. Press Alt + 3to activate theyellow channel, or click Yellow channelin the Channelsdocker. This channel shows an
almost perfect mask for the sky (Figure 7).
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10 CorelDRAWX4 Insights from the Experts
Figure 7: The sky has been isolated in the yellow channel.
3 Copy the yellow channel to the Clipboard (press Ctrl + C, or from the menu bar, click
Edit Copy).
4 Select the composite channel (press Alt + 0, or click the CMYK channel in the Channels
docker).
5 Activate Paint on maskmode by pressing Ctrl + Kor clicking MaskPaint on mask
from the menu bar.
6 Click EditPastePaste as new selectionto paste the mask from the Clipboard.
7 Deactivate Paint on maskmode (press Ctrl + K, or from the menu bar, click Mask
Paint on mask).
8 Import a photo of a sky that you want to use for the background. To do this, press Ctrl + I,
or from the menu bar, click FileImport. Locate the file sky.tifin the folder Program
Files\Corel\CorelDRAW Graphics Suite X4\Tutorial files. Drag the sky object, as necessary,
so that it covers the original sky area.
9 Create a clip mask in the new sky object by using the current mask (right-click the skyobject thumbnail in the Objectsdocker, and choose Create clip maskFrom mask).
You can also create the clip mask by clicking ObjectClip maskCreateFrom mask
from the menu bar.
10 The main problem with the original sky was the lack of cyan. Change the merge mode of
the sky object to cyan (right-click the thumbnail of the sky object in the Objectsdocker,
click Properties, select Cyanfrom the Mergelist box, and click OK).
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CorelDRAWX4 The art of masking 11
11 The new sky is darker than the original image. To reduce the objects opacity, right-click
the object in the Objectsdocker, click Properties, and move the Opacityslider until the
sky illumination looks natural compared with the original image.
12 The new sky color is covering part of the original houses, so we want to increase the clip
mask contrast. Select the clip mask by clicking the clip mask icon in the Objectsdocker,
and open the tone curve (AdjustTone curve). Drag to adjust the tone curve until you
are satisfied with the result (Figure 8).
Figure 8: Use the tone curve to increase contrast.
13 Open the Infodocker by clicking WindowDockersInfo. Move the cursor over the
sky area while reading the color values in the Infodocker. The values show that the sky
has almost no magenta. To add magenta, duplicate the sky object (right-click the objects
name in the Objectsdocker, and choose Duplicate selected), and then change the
merge mode of the duplicate object to magenta (right-click the thumbnail of the object in
the Objectsdocker, click Properties, and select Magentafrom the Mergelist box).
Decrease the objects opacity, and click OK.
14 The sea area also needs enhancement. Activate the object that has cyan as the merge
mode, and duplicate it (right-click the objects name in the Objectsdocker, and choose
Duplicate selected).
15 Discard the clip mask from the new object by right-clicking the clip mask icon and selecting
Remove clip mask. Move the object down to cover the sea, and change the object's
opacity to approximately 10%.
16 Create a clip mask to hide the object. To do this, right-click the original sky object
thumbnail in the Objectsdocker, and choose Create clip maskTo hide all.
17 Activate the Painttool (press P), click the white color swatch on the color palette, and
brush over the sea to let the cyan come up through the clip mask.
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12 CorelDRAWX4 Insights from the Experts
18 Combine all objects with the background (click ObjectCombineCombine all
objects with background), and save the file. The image is now finished (Figure 9).
Figure 9: The sky has been replaced to enhance the photograph.
When used properly, Corel PHOTO-PAINT is a friendly and capable tool. Remember: when a
mask is needed, the first step is not necessarily to activate a masking tool, but to take a good
look at the channels.
Copyright 2007 Corel Corporation. All rights reserved. All trademarks or registered trademarks are the
property of their respective owners.