Use the Surface Blur FilterSelect the Layers panel.

o Select the layer you want toadjust. To create a smart object,click the Filter menu, and thenclick Convert for Smart Filters.o Click the Filter menu, point to Blur,and then click Surface Blur .

• Drag the Radius slider left or rightto decrease or increase theamount of blur applied to theimage.

o Drag the Threshold slider left orright to decrease or increase theacceptance of the shift inbrightness of the imageinformation (the edges).

o Click OK.

Use the Shape Blur Filtero Select the Layers panel.

o Select the layer you want toadjust. To create a smart object,click the Filter menu, and thenclick Convert for Smart Filters.o Click the Filter menu, point to Blur,and then click Shape Blur .

• Select a shape (called a kernel)from the available options.

Drag the Radius slider left or rightto decrease or increase theamount of blur applied to theimage.

o Click OK.

Originalimage

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Chapter 7 Working with Adjustment Layers, Filters, and Tools 173

Using the GaussianBlur and OespeckleFilters

Use the Gaussian Blur Filtero Select the Layers panel.

o Select the layer you want toadjust. To create a smart object,click the Filter menu, and thenclick Convert for Smart Filters.

• Click the Filter menu, point to Blur,and then click Gaussian Blur.o Select the Preview check box toview the results.

• Drag the Radius slid er or enter apixel value to increase ordecrease the amount of Gaussianblur applied to the image.

• Click OK.

Use the Oespeckle Filtero Select the Layers panel.

o Select the layer you want tochange. To create a smart object,click the Filter menu, and thenclick Convert for Smart Filters.

• Click the Filter menu, point toNoise, and then click Despeckle.

Photoshop applies the Despecklefilter to the image.

174 Chapter 7

You can also apply the Gaussian Blur filter that blurs an image or aselection by a controllable amount. While not strictly a restoration tool,the Gaussian Blur filter can be used to add a sense of depth to theimage. For example, you could select and blur the background of animage while leaving the foreground in focus. The outcome of the filteris to create a hazy, out-of-focus effect on the image or selection.Another filter, the Despeckle filter, detects the edges in an image andblurs the entire image except those edges. Of course, there are no realedges in a Photoshop document-the Despeckle filter works alongareas where there is a significant shift in the brightness of the pixels.Since a shift in brightness usually signifies an edge, the Despeckle filterperforms a very accurate blurring of the image while preserving detail.

OK

Cancel

Radius: [j.s I pixels

Using the GaussianBlur and OespeckleFilters

Use the Gaussian Blur Filtero Select the Layers panel.

• Select the layer you want toadjust. To create a smart object,click the Filter menu, and thenclick Convert for Smart Filters.

Click the Filter menu, point to Blur,and then click Gaussian Blur .

• Select the Preview check box toview the results.

Drag the Radius slider or enter apixel value to increase ordecrease the amount of Gaussianblur applied to the image.

o Click OK.

Use the Oespeckle Filtero Select the Layers panel.

Select the layer you want tochange. To create a smart object,click the Filter menu, and thenclick Convert for Smart Filters.o Click the Filter menu, point toNoise, and then click Despeckle.

Photoshop applies the Despecklefilter to the image.

174 Chapter 7

You can also apply the Gaussian Blur filter that blurs an image or aselection by a controllable amount. While not strictly a restoration tool,the Gaussian Blur filter can be used to add a sense of depth to theimage. For example, you could select and blur the background of animage while leaving the foreground in focus. The outcome of the filteris to create a hazy, out-of-focus effect on the image or selection.Another filter, the Despeckle filter, detects the edges in an image andblurs the entire image except those edges. Of course, there are no realedges in a Photoshop document-the Despeckle filter works alongareas where there is a significant shift in the brightness of the pixels.Since a shift in brightness usually signifies an edge, the Despeckle filterperforms a very accurate blurring of the image while preserving detail.

Gaussian Blur

OK

Cancel

Radius: [is ] pixels

a t>.D !U

Use the Unsharp Mask FilterSelect the Layers panel.•Select the layer you want tochange. To create a smart object,click the Filter menu, and thenclick Convert for Smart Filters.

Click the Filter menu, point toSharpen, and then click UnsharpMask. 10010•Select from the following options: Amounl:~"

6

• Preview. Select the option to Radius: ~ Pi.els

view changes to the imagedirectly in the active document Threshold: c=J levelswindow. 6

• Amount. Drag the slider orenter a value to determine howmuch to increase the contrastof pixels.

• Radius. Drag the slider or entera value to determine thenumber of pixels surroundingthe edge pixels that affect thesharpening.

• Threshold. Drag the slider orenter a value to determine howdifferent the sharpened pixelsmust be from the surroundingarea before they areconsidered edge pixels andsharpened by the filter .•Click OK.

Using the UnsharpMask Filter

The Unsharp Mask filter creates a visually sharper image by locatingpixels that differ in value from surrounding pixels. When the filter isapplied to the image, the bordering pixels specified by the thresholdoption get lighter and the darker pixels get darker. It's important tounderstand that the Unsharp Mask does not actually sharpen theimage; it only attempts to create the illusion of sharpness. Be careful;an over-application of this filter creates harsh images with raggededges and shadows. Also, the effects of the Unsharp Mask filterappear more severe when viewed with the low resolution of a com-puter than when the document is output to a printer.

TheUnsharpMaskfilter appliedto the image.

Chapter 7 Working with Adjustment Layers, Filters, and Tools 175

Using the ShakeReduction Filter

Use the Shake Reduction Filtero Select the Layers panel.

• Select the layer you want tochange. To create a smart object,click the Filter menu, and thenclick Convert for Smart Filters.

• Click the Filter menu, point toSharpen, and then click ShakeReduction.

The filter automatically tries to finda blur trace problem region.

• To move the blur trace region,point to the center gray circle, andthen drag to another position.

4) To resize the blur trace region,drag a white square resizehandles.

• To add a suggested blur traceregion, click the Add SuggestedBlur Trace button. If no regionexists, click OK.

• Add Manually. Click the BlurEstimation Tool button, andthen drag a blur trace region.o To select a blur trace region, click

the center gray circle in the Mainpreview or the thumbnail.

To delete a blur trace, select theblur trace region, and then clickthe Delete Blur Trace button.o To show or hide the bounding boxfor blur trace regions, select orclear the Show Blur EstimationRegions check box.

176 Chapter 7

The Shake Reduction filter (New!) analyzes and sharpens an out-of-focus image due to camera motion. Sometimes when you take a photo,a slight movement of the camera can cause the image to blur. This istypically caused by a slow shutter speed or a long focal length. Theimage may be in focus, however, it's just a blurry. If this is the case, youcan fix the problem by analyzing the image with the Shake Reductionfilter, which automatically tries to determine a blur trace region of theimage that needs help. You can move and adjust the specified area aswell as manually add more regions to apply the Shake Reduction filter.

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Cl) To activate or deactivate a blurtrace, select or clear the checkbox under the thumbnail.

• Select from the following BlurTrace Settings options:

• Blur Trace Bounds. Drag theslider to specify the size of theblur trace boundary.

• Source Noise. Specify theamount of noise to match theimage.

• Smoothing. Drag the slider tospecify smooth sharpening;lower is more sharpening detailwith more noise, while higher isless sharpening detail with lessnoise.

• Artifact Suppression. Drag theslider to reduce artifacts fromsharpening.

G To preview image details in theDetails area, click a Zoom icon.

• Undock Detail. Click to displayDetail preview in the Mailpreview. Click the Close buttonto close the preview.

• Lock Detail. Click to lock thedetail in place.

G) Select the Preview check box orpress P to view the results in theMain preview.

• Click OK.

Did You Know?You can show the blur trace of thecamera movement. In the Advancedarea of the Shake Reduction filter, clickthe thumbnail (New!), and then clickthe ExpandBlur Trace icon. A mask ofthe blur trace movement appearsshowing how your hand was moving.Click again to exit.

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Chapter 7 Working with Adjustment Layers, Filters,and Tools 177

Using the SmartSharpen Filter

Use the Smart Sharpen Filtero Select the Layers panel.

• Select the layer you want tochange. To create a smart object,click the Filter menu, and thenclick Convert for Smart Filters.o Click the Filter menu, point toSharpen, and then click SmartSharpen.o Select the Preview check box toview the results.

TIMESAVER Click and hold theimage preview to display theoriginal results (New!).

o To use CS6smart sharpen settings,click the Settings icon (New!),and then select an option:

• Use Legacy. Select to use theCS6smart sharpen method.

• More Accurate. Select for amore accurate (slower)sharpening effect.o Click the Preset list arrow, and

then select a user-defined preset.

•• Select from the following Sharpenoptions:

• Amount. Drag the slider todetermine the amount ofsharpness applied to the image.

• Radius. Drag the slider todetermine the width of thesharpening effect.

178 Chapter 7

The Smart Sharpen filter sharpens the details (pixels) of an out-of-focusimage without increasing the related noise (New!). You can use the fil-ter in two ways, either the CC (New!) or CS6(legacy with more noise)method. The filter works in much the same way as the Unsharp Maskfilter. The major difference is the ability of Smart Sharpen to removepreviously applied Gaussian, Lens, and Motion Blur filters. The problemis that Unsharp Mask will attempt to sharpen what it assumes to be anout-of-focus image. Unfortunately, an image taken with an out-of-focuslens, and a Lens blur are two different things, and that's where theSmart Sharpen filter comes to the rescue.

Original image

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• Reduce Noise. Drag the sliderto determine the percentage ofnoise to allow (New!).

• Remove. Click the list arrowand then select what type ofblur effect you are removingfrom the image.

• Angle. Enter the angle of theMotion Blur filter to remove.

• Click the Expand icon as neededto display the options for Shadowsand Highlights.o Select from the following Shadowoptions:

• Fade Amount. Drag the slider todetermine the amount ofshadow correction applied tothe image.

• Tonal Width. Drag the slider toset the width of the tonalvalues in the image shadows.

• Radius. Drag the slider tochoose the scale size for theshadows.

G Select from the following Highlightoptions:

• Fade Amount. Drag the slider todetermine the amount ofhighlight correction applied tothe image.

• Tonal Width. Drag the slider toset the width of the tonalvalues in the image highlights.

• Radius. Drag the slider tochoose the scale size for thehighlights .

• To save a copy of the currentSmart Sharpen settings, click thePreset list arrow, and then clickSave Preset.

• To delete the active savedSmart Sharpen settings, clickthe Preset list arrow, and thenclick Delete Preset.

G Click OK.

Smart Sharpen

B

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ImageusingSmartSharpen

Chapter 7 Working with Adjustment Layers, Filters, and Tools 179

Using Sharpen, Blur,and Smudge Tools

Use the Sharpen, Blur, orSmudge Tools

o Select the Sharpen, Blur, orSmudge tool on the tool box.

• Blur. Softens hard edges orreduces detail.

• Sharpen. Increases contrast.

• Smudge. Pushes a calor in thedrag direction to create asmudge effect.

• Select a brush tip.e Select brush options on theOptions bar:

• Mode. Click the list arrow, andthen select a mode: Normal,Darken, Lighten, Hue,Saturation, Calor or Luminosity.

• Strength. Specify a percentagevalue.

• Sample All Layers. Select tomodify pixels from all visiblelayers.

• Protect Detail (Sharpen tool).Select to minimize pixelizationwhile maintaining details.

• Finger Painting (Smudge tool).Select to use the backgroundcalor as the smudge. Deselectto use the calor under thepointer.o Drag over the part of the image

you want to change.

180 Chapter 7

If you want to sharpen or blur parts of an image, you can use theSharpen, Blur, or Smudge tools. These tools are grouped together onthe toolbox. The Sharpen tool increases contrast along edges toincrease sharpness; the more you use the tool, the greater the sharp-ening effect. The Blur tool softens hard edges or reduces detail; themore you use the tool, the greater the blur effect. The Smudge tool cre-ates a finger drag through wet paint effect.

Original image

Image using Sharpen tool

Using the CloneStamp Tool

Use the Clone Stamp Toolo Select the Clone Stamp tool on the

toolbox.

• Select a brush tip, and then selectbrush options, such as blendingmode, opacity, and flow, on theOptions bar.e Select the Aligned check box onthe Options bar to sample pixelscontinuously without losing thecurrent sampling point. Clear thecheck box to continue using pixelsfrom the initial sampling pointeach time you stop and resumepainting.

• Click the Sample list arrow on theOptions bar, and then select thelayer option you want to use toobtain sample data: Current Layer,Current & Below, or All Layers.

• Hold down the Alt (Win) or Option(Mac) key, and then click an areato sample the portion of the imageyou want to use for your sample.o Drag over the area of the imageyou want to restore or modify.o To select more samples, click theWindow menu, click CloneSource, click a clone button, andthen repeat steps 5 & 6.

One of Photoshop's most powerful features is its ability to retouch aphotographic image. When you want to manipulate an image, you canapply the Clone Stamp tool. The Clone Stamp tool allows you to samplethe image, and then apply that sample somewhere else on the sameimage, or on another open document. When you use the Clone Stamptool, by selecting Aligned in the Options bar, you can reuse the mostcurrent sampling point no matter how many times you start and stoppainting. When Aligned is deselected, you'll reuse the same sampledpixels each time you paint. For example, you could use the Clone Stamptool to repair damage to an image, remove a tree, or even add someoneto or remove them from an image. If you want to take multiple samples,the Clone Source panel allows you to set up to five different samplesources for the Clone Stamp or the Healing Brush tools. Select ShowOverlay and the Clipped option to see the clone source inside yourbrush cursor as you paint.

CloneStamptool

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Joshuatreeremovedusingthe CloneStamptool.

Chapter 7 Working with Adjustment Layers, Filters, and Tools 181

Setting Up MultipleClone Sources

Use the Clone Source Panel

o Click the Clone Source button todisplay the Clone Source panel.

o To determine if a Clone Stampbutton is in use, point to it todisplay a Screen Tip.o Click a Clone Stamp not in use, orone you want to replace.

• To set a sample point, Alt (Win) orOption (Mac), and click a point.

o To show the overlay, select theShow Overlay check box.

o Select overlay options:

• Opacity. Specify a percentage.

• Clipped. Select to clip theoverlay to the brush size.

• Auto Hide. Select to hide theoverlay while you paint.

• Invert. Select to invert theoverlay.

• Blend. Click the list arrow, andthen select a blending mode.o To scale or rotate the sample

source, enter the values you want.

• Flip. Click to reverse (horizontalor vertical) the clone source.

182 Chapter 7

The Clone Source panel allows you to set up to five different samplesources for the Clone Stamp or Healing Brush tools in Photoshop. TheClone Source panel contains five clone buttons to which you can assignsamples. Simply open the Clone Source panel, click a Clone Stamp but-ton, and then select the sample you want. The Clone Source panelsaves the samples until you close the document. To help you clone thesource in a specific location, you can overlay your sample source andshow the overlay on the screen. The overlay allows you to view yourchanges and helps you visualize where to paint. In addition, you canscale and rotate the sample source to clone the sample at a specificsize and orientation as well as use the Flip buttons for reversing theclone source. If you need to paint in a very specific locationrelative to the sampling point, you can use the x and y pixel offset.

Offset:

x: 1-131 px

Y: 1-71 px

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Frame Offset: 1 0 o lock Frame

Show Overlay Clipped

Opacity: ~ 0 Auto Hide

I Normal ; I 0 Invert

Using the Dodge andBurn Tools

Use the Dodge and Burn Toolso Select the Dodge or Burn tool onthe toolbox.o Select a brush tip, and then selectbrush options on the Options bar.o Click the Range list arrow on theOptions bar, and then clickMidtones (middle range of grays),Shadows (dark areas), orHighlights (light areas) .

• Specify the Exposure value for thestroke .

• To use the brush as an airbrush,click the Airbrush button.Alternately, select the Airbrushoption in the Brushes panel.o Select the Protect Tones checkbox to minimize clipping andreduce hue shifting.

o Drag over the part of the imageyou want to lighten or darken.

Did You Know?The Sponge tool does not lighten ordarken an image. It saturates or desat-urates color values as you drag overparts of the image. Since overexposedor underexposed images have a ten-dency to lose some tonal values andappear flat, you can use the Spongetool (with Saturate) to return some ofthe color values back to the image.

You can also use the Dodge and Burn tools to lighten or darken specificareas of an image. If you wanted to lighten the shadow areas of animage, you would use the Dodge tool, and conversely, if you wanted todarken the highlight areas of an image, you would select the Burn tool.While there are other ways to control the highlights and shadows of animage, such as a Levels adjustment, the Dodge and Burn tools are con-trolled by using a brush and painting in the image. That kind of controlgives you the option to choose exactly what you want to modify.

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Chapter 7 Working with Adjustment Layers, Filters, and Tools 183

Using the HealingBrush and Patch Tools

Use the Healing Brush Tool• Select the Healing Brush tool on

the toolbox.

o Select a soft round brush on theOptions bar.

o Create a new layer above the layeryou want to modify.

• Click the Sample list arrow, andthen select the layer option youwant to use to obtain sample data:Current Layer, Current & Below, orAll Layers.o Hold the Alt (Win) or Option (Mac)key, and then click on the area ofthe image for a sample.

This area should represent thetexture (not colorl of the areas youwantto heal.

o Use small short strokes andcarefully drag over the areas youwant to change, then release yourmouse and move to the next area.

The Healing brush works to matchthe sample to the source.o If the texture of the area you arehealing changes, repeat step 4,and sample a different area.

184 Chapter 7

These tools have become my favorite tools for working with digitalimages and correcting problems. The Healing Brush tool allows you tocorrect small imperfections, making them disappear into the surround-ing image. This tool works from a sample of the original image, and thenmatches the texture, lighting, transparency, and shading of the sampledpixels into the source pixels. If an image contains a lot of random noise,before working with the Healing Brush, try lowering the amount of noisewith the Reduce Noise filter. After you've applied the Reduce Noise fil-ter, you can use the Healing Brush to clean up the rest of the problemareas. The Patch tool takes a sample and matches the texture, lighting,transparency, and shading of the sample to the source, creating analmost seamless repair of the image. You can also use the Patch tool toclone isolated areas of an image. When you use healing operations in aseparate layer, you gain control over the process; you can even use theopacity and blending mode settings to further control the healingprocess. Always use the Healing Brush in a separate layer ... always.

The image contains scratches and spots

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The Healing Brushmakes short work ofcorrecting damagedimages.

Use the Patch Toolo Select the Patch tool on thetool box.o Select the layer you want toadjust.o Using the Patch tool, select thedamaged area of the image youwant to repair (the Patch toolfunctions just like the Lassoselection tool).

oo

Click the Source option on theOptions bar.

Move into the middle of theselection marquee, and drag theselection over the area you wantto repair and release. As you drag,you will see a copy of the area youare moving over appear in theoriginal selection.o Release your mouse when you seethe best match.

The Patch tool corrects thedamaged area of the image.

o Repeat steps 2 through 6 to patchany other damaged areas of theimage.

Did You Know?The Patch tool options on the Optionsbar provide power. Onthe Options bar,use the Source option with the Patchtool if you are selecting the damagedarea and dragging it over the goodarea, and use the Destination option ifyou would rather select a good area todrag over the damaged area. TheTransparent option preserves transpar-ent areas during the patching process.

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ThePatchtoolremovedthe ringsunderthe model'seyes.

Chapter 7 Working with Adjustment Layers, Filters, and Tools 185

Working with theSpot Healing Brush

Use the Spot Healing Brusho Select the Spot Healing Brush tool

on the toolbox.

Select a soft round brush on theOptions bar.e Create a new layer above the layeryou want to modify.

o Select the Sample All Layersoption.o Using small short strokes, carefullydrag over the areas you want tochange, then release your mouseand move to the next area.

The Spot Healing brush works tomatch the sample to the source.

Did You Know?You can use the Clone Source panel toset different sampling points. TheClone Source panel allows you to setup to five different sampling sourcepoints for the Clone Stamp tools orHealing Brush tools. Click a clonesource button in the Clone Sourcepanel, and then click a sampling point.To open the Clone Source panel, clickthe Window menu, and then clickClone Source. Youcan also scale orrotate the clone source, or show anoverlay of the clone source.

186 Chapter 7

A powerful tool in Photoshop's formidable arsenal of restoration andcorrection tools is the Spot Healing Brush. With a name similar to theHealing Brush, you might expect that the tools have similar features,and you would be correct. The main difference between the two toolsis that the Spot Healing Brush does not require you to take a sample ofthe area to heal. The Spot Healing Brush tool takes the area sample asyou work by sampling the surrounding pixels. The Spot Healing Brush,as its name implies, works best on small spots and imperfections. Toheal larger areas, the standard Healing Brush, Patch tool, and even thegood old Clone Stamp tool are your best bets.

._-- ~+

Originalimage

TheSpotHealingBrushsmoothedoutsomeofthewrinkles.

Working with theRed Eye Tool

Use the Red Eye Toolo Select the Red Eye tool on thetoolbox.

• Select from the following optionson the Options bar:

• Pupil Size. Select the size ofthe pupil in relation to theamount of red eye.

• Darken Amount. Select howmuch you want to darken thepupil area of the eye.

o Click in the middle of the redportion of the eye, and release.

The red is removed, and the pupilis darkened.

The Red Eye tool not only gives the digital restorer an excellent tool forremoving pesky red eye, it will also remove the green and white reflec-tions in pets' eyes. The biggest generator of red eye is the onboardflash on your camera. Actually, if they would simply rename a camera'sbuilt-in flash, "red eye generator," it might help amateur photographerspay more attention. However, until that day comes, designers will stillhave to deal with images that contain red eye. The Red Eyetool per-forms two operations: it desaturates the red values, and darkens thepupil.

Originalimage

._.. ~+9. C/.t( 1'.

Theredeyeis removedwiththe clickofyourmouse.

Chapter7 Working with Adjustment Layers, Filters,andTools 187

Controlling TonalRange

Control Tonal Rangeo Select the layers panel.

• Select the layer to which you wantto control tonal range.

o Click the Create New Fill orAdjustment layer button, and thenclick levels or use the icon forLevels from the Adjustments panel.

• To open the Properties panel,click the Window menu, andthen click Properties.

• To have Photoshop set levels foryou, including improved smootherhistograms, click Auto.Continue to make adjustments, oruse the results.

• To use common Levels settings,click the Preset list arrow in theProperties panel, and then select apreset.o Click the Channel list arrow toselect whether to work on theentire image, or just one of theimage's default color channels(useful for color correction).

o Drag the Shadow input slider tothe right to adjust the balance ofblack in the image.

o Drag the Midtone input slider leftor right to lighten or darken themidtones of the image.

188 Chapter 7

The Levels adjustment lets you adjust the tonal range of an image bygiving you three sliders-one each for shadows, midtones, and high-lights. Dragging the sliders precisely adjusts the tonal ranges of animage. In addition, the Output sliders let you adjust the ink percentagesused to print during output. By adjusting the output ink levels, you avoidthe overly black images that sometimes plague images printed with highdot-gain papers. The Levels adjustment provides smoother histograms.

Original image

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o Drag the Highlight input slider tothe left to adjust the balance ofwhite in the image.

Cl) Drag the Black and White OutputLevels sliders left and right toadjust the percentage of ink usedin printing the image.

CD To load a previously saved Levelsadjustment, click Load LevelsPreset from the Properties optionsmenu, and then select and loadthe file.

G Click Save Levels Preset from theProperties options menu to savethe current Levels adjustment.

G Use the eyedropper tools to selectblack, white, and midtone pointsdirectly within the active image.

• Use the available buttons to fine-tune the adjustment and navigatethrough the Properties panel.

• The rectangle with down-pointing arrow icon creates aclipping group.

• The eye icon toggles visibility ofthe adjustment layer.

• The eye icon with an arrowallows you to see the previousstate before the adjustmentwas made.

• The circular arrow returns theimage to the defaultadjustments.

• The trash can icon deletes theadjustment layer.

Did You Know?You can view the Levels Histogramanytime. Click the Window menu, andthen click Histogram. Photoshop opensa Histogram panel that lets you viewtonal changes to the image as youmake them.

/

Properties ••••• ~Auto-Select Parameter

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Save levels Preset. ..load Levels Preset ...Delete Current Preset

Preset: ICustom : IIRGB :1 ~

Auto Options ...Show Clipping for Black hite Points

Reset levels

CloseClose Tab Group

Output levels: ~ ~

Tonalchangesapplied

Chapter 7 Working with Adjustment Layers, Filters, and Tools 189

Working with theHistogram Panel

Work with the Histogram Panel

o Select the Histogram panel.

• Click the Window menu, andthen click Histogram.

• Click the Histogram Optionsbutton, and then select from thefollowing options:

• Uncached Refresh. Click torefresh the image cache(rescans the image).

• Compact View. Click to createa small, panel-size view of theHistogram panel.

• Expanded View. Click to createan expanded view of theHistogram panel. Includesoptions to view specificchannels, luminosity settings orcolor.

• All Channels View. Click toview all the color channels.

• Show Statistics. Click to showhistory statistics.

• Show Channels In Color. Clickto show the channels usingspecific colors, such as red,green, and blue.

190 Chapter 7

Photoshop's Histogram panel gives you many options for viewing tonaland color information about the active image. The Histogram's defaultdisplay is the tonal range of the entire image. However, you can useany of Photoshop's selection tools, select a portion of the active docu-ment, and display a histogram for just that portion of the image. You canalso view a specific color channel or view all the channels at once. Thetonal range and color values for an image are vitally important to gen-erating great graphics, and the Histogram panel is a great resource forinstant up-to-date information.

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Viewing Information Using the Histogram PanelYoucan view information about a specific pixel or pixel range usingthe Histogram panel. Make sure the ExpandedView option is select-ed, and then place the pointer in the histogram to view informationabout a specific pixel value. Toview information about a range ofvalues, drag in the histogram to highlight the range.