adobe photoshop cs5 -...

of 12 /12
Adobe Photoshop CS5 Photo Adjustments [email protected]

Author: hoangthu

Post on 01-Apr-2019

213 views

Category:

Documents


0 download

Embed Size (px)

TRANSCRIPT

AdobePhotoshopCS5PhotoAdjustments

[email protected]

AdobePhotoshopCS5:PhotoAdjustments2.0Hours

TheworkshopwillcovercreatingandmanipulatingbasicgraphicsinPhotoshop,andsortingandtagginginBridge.Topicsincludeanoverviewofcommontoolbarfeatures,creatingimagesusinglayers,andaddingtexttoimages.ThisworkshopassumesnoexperiencewithPhotoshoporBridge,butrequiresaworkingknowledgeoftheMicrosoftWindowsoperatingsystem.Worksheets:

PhotoAdjustments.........................................................................................................................1

CropTool...................................................................................................................................1

Adjustments..............................................................................................................................2

AdjustmentPanel......................................................................................................................2

LevelsAdjustment.....................................................................................................................3

CurvesAdjustment....................................................................................................................5

AdjustmentLayers....................................................................................................................5

BlendingMode(Levels/Multiply)............................................................................................6

Variations..................................................................................................................................7

SharpeningusingtheHighPassfilter........................................................................................8

ClassExercises.................................................................................................................................9

Page1

PhotoAdjustmentsPhotoshopcanadjustimagesinmanydifferentways.Someadjustmentsaredestructive.Thismeansyouaresomehowchangingpixelsandyoulosetheoriginalimage.Otheradjustmentscanbecreatednondestructivelysotheimageisneverharmedandyoucanalwaysgetbacktotheoriginalandeditinotherways.CropToolOneofthemostcommonwaystoadjustanimagewouldbetoadjustthesize.Usingacroptool,youcansavejustpartofanimagemakingtheimagesmaller.Croppingcanalsogiveyouadifferentlookbydeletingunnecessaryareasandkeepingjustwhatyouwantandframingtheimageinthewayyouwant.Croppingwouldbeadestructiveeditoradjustment.CroptoolWhenusingthecroptool,youcanselectarectangleboxanddeleteeverythingoutsidethatbox.WiththeOptionsbar,youcanconstrainyourcropselectionsoitwillonlyselectaspecificsizewithaspecificresolution.Youcancropoutsideoftheimagetoaddcanvasspace.Youcanstraightenbycheckingtheperspectiveboxontheoptionsbarafteryoucreatethecropbox.

Thendragthecornersofthecropboxtoparallelwiththehorizonoftheimage.Thiswouldbeawaytomakeallimagesthesamesize.Setthecropandthencropallimagesinagroupwiththesamesettings.Anondestructivewaytoblockoutpartsofanimagewouldbetouseamask.

Thecropcanbesettoconstrainprintsizeandresolution

Page2

AdjustmentsOtherAdjustmentssuchasBrightness/Contrast,HueandSaturation,BlackandWhite,etc.donttakeawayanypartsofanimage,buttheydoalterthewaytheimageslook.AdjustmentscanbemadedirectlytotheimagebychoosinganadjustmentfromtheImage>AdjustmentsMenu.Whenyoucreateanadjustmentinthisway,youareaffectingtheoriginalimageandalteringpixels.Ifyoudothisthebestpracticeistocreateacopylayerandmakecorrectionstothecopylayer.

AdjustmentPanelThere is another way to make adjustments to images inPhotoshopthatisnondestructive(doesnotdamageordeleteanypixelsintheoriginalimage).ThatistocreateanadjustmentlayerandusetheAdjustmentPanel.TheadjustmentsdepictedbyiconsareBrightness/Contrast,Levels,Curves,ExposureVibrance,Hue/Saturation,ColorBalance,BlackandWhite,PhotoFilter,ChannelMixer,Invert,Posterize,Threshold,GradientMap,SelectiveColor.Photoshopaddedbuilt inAdjustment Presets. Thepresetscan be used to add adjustments quickly or they can be astartingpointandyoucanthenaddyourownadjustments.Adjustmentlayerscanbeedited,youcanusemultipleadjustmentlayersandsetopacity.Tosaveadjustmentlayerstoeditlater,makesureyousaveinaformatthatsaveslayerssuchasthepsdfileorthetifffile.

WhenyouchooseanadjustmentfromtheAdjustmentPanel,youarepresentedwithdropdownsand/orsliderstoalterthewayyourimagelooks.

Page3

LevelsAdjustmentThisisaLevelsadjustmentpanel.LevelaffectstheBrightnessofanimage.TheLevelspanelshowsaHistogram.Thisshowsthespreadoftonalvalueswithintheimage.TheHighlightsareontherightsidewithawhitesliderandtheShadowsareontheleftsidewithablacksliderandthemiddlegraysliderrepresentsthemidtonesofanimage.Thishistogramshowsaspreadacrossthebrightnessvaluesoftheimage.

1Returntolist(iconview)2ExpandedView3AffectsallLayers(clippingicon)4ToggleVisibility(beforeandafter)5PreviousState(clickandhold)6Reset7Delete

ThisHistogramshowsaconcentrationofdarksintheimage.Byusingtheslidersinthispanel,youcoulddragthewhiteslidertothelefttoincreasethebrightnessintheimage.Therearealsodropdownsthatarepresettoadjustcertainpartsofanimage.Forexamplethepresetcouldincreasecontrastorlightenshadows.Ifyouclickonthedefaultinthedropdownitwillbringtheadjustmentbacktotheoriginalimage.Sometimesjustpartsofanimageneedadjustment.Inthatcaseyoumaywanttomakeaselectionoftheareaneedingadjustmentandthenaddtheadjustmentlayer.

6 7

Page4

Inthisexercisewewillusethelevelsadjustmentlayertobrightenadarkareaofapicture.Thenwewillcorrectthecoloroftheimage.1.OpentheMittenwald.jpgfile.Thecloudsandskylookgood,butthebuildingsareintheshadowsandtoodark.CreateaduplicatelayerandnameitBuildings.Toggleoffthebackgroundlayer.2.Makeaselectionofthebuildingswiththepolygonalormagneticlassotool.RememberyoucanuseQuickmaskmodeifnecessary.3.Addanadjustmentlayerbyclickingtheaddadjustmentlayericonandchooselevels.4.Thelevelsdiagramboxopens.TryusingtheAutobuttonandseeifthatcorrectstheproblemofthedarkbuildings.Ifthatdoesnotdowhatyouwant,presstheresetbutton.ResetandthenmovethesmallgraytrianglebelowtheHistogramtoadjustthemidtones.Movingitslightlytotheleftwilllightenthearea.Makesurethepreviewboxischeckedandyoucanseethechangesasyoumovethesliders.Youwantthebuildingslighter,butnottoowashedout.Lookatyourlayerspalettetoseehowtheselectionyoucreatedactuallycreatedamaskonyourimage.Lookatthechannelstoseethatthelevelsmaskissavedandcanbereused.Awaytocorrectthecolorcastwouldbetoaddanotheradjustmentlayer.ThistimeuseaHue/Saturationlayer.EdittheMasterandusethesaturationslider.

HistogramShowsthepixeldistributionofthetonalrangeofyourimage.

Midtones

Highlights

Shadows

Page5

CurvesAdjustmentTheCurvesAdjustmentaffectstonesandcontrast.WheretheLevelsadjustmentgivesyouthreepointstoalter,theCurvesadjustmentgivesafulllinethatcanbealtered.Therightsideaffectsthehighlightsandtheleftsideeffectstheshadows.Clickingonthelineanddragginguplightensanddraggingdowndarkens.Thecurvespanelalsohasascrubbyadjustment.Turnitonbyclickingonthescrubbyandthenclickintheimageanddragupanddown.Uplightenstheimageanddowndarkens..

1Returntolist2ExpandedView3AffectsallLayers4ToggleVisibility5PreviousState6Reset7Delete

Theeyedroppertoolsallowyoutosetshadowpoints(black),midtones(gray)andhighlights(white).AdjustmentLayersWhenyouaddanadjustmentlayeritwillshowintheLayersPanel.Withanadjustmentlayeryoucanuseallthelayeroptionsonthatadjustmentlayerjustasyouwouldaregularlayer.Visibilitycanbeturnedonandoff,opacitycanbealteredandblendmodescanbechanged.Theycanbeduplicatedanddeleted.Anadjustmentlayeraddsalayermaskthatcanbealteredjustlikeanylayermask.Paintwithblacktohideandpaintwithwhitetoshow.

1 2 3 4 5 6 7

Page6

BlendingMode(Levels/Multiply)Inthisexercisewewilluseablendingmodetorepairanoverexposedorwashoutimage.1.Openlevels_multiply.jpg (fromthePhotoshop7WOWBook/JackDavis/Peachpitpress).2.Addalevelsadjustmentlayerinthemultiplymode.ForthislayerstartatthelayerMenu.Layer>NewAdjustmentlayer>Levels.Choosingtheadjustmentlayerthiswaygivesusamodeoptionchoice.Formodeusethedropdownboxandchoosemultiply.Usingthemultiplymodeisjustlikeputtingtwoidenticalslidestogethertoenhancethecolor.Whiteinthismodeisneutralandactsliketransparentpartsofaslide.

3. Afteryouhaveappliedtheonelevelsadjustmentlayeryoucanduplicateitandapplyitagainformoreadjustment.Toduplicateanadjustmentlayer,justlikeanylayer,youcanjustclickonthelayerinthelayerpaletteanddragittothenewlayericononthebottomofthelayerspalette.4.AnotheroptionwouldbetoaddalayerusingtheLayerPanel.Altclickonthenewlayericontobringupthedialogboxbelow.SetthemodetoOverlay,andclicktheboxtofillwith50%gray(r,g,b=128).Thiscreatesalayermask.Grayisneutralanddoesnotaffecttheimage.Thenyoucanpaintwithdarkercolor(grayorblack)todarkentheimageandpaintwithwhitetolightentheimage.

Page7

VariationsAnotheradjustmentthatisprettyeasytouseisvariations.Image>Adjustments>Variations.Thisscreenshowstheoriginalimage.Italsoshowsmanyvariations.Clickonapicturetodarkenthepictureoraddredsoraddgreensasitsaysonthepicturelabels.Theoriginalpictureisalwaystheretocomparetothenewversion.Youcanclickmorethanonce.Soifyouwantedtogetthepicturemuchdarker,youwouldclickdarkeruntilitlooksthewayyouwantittolook.ClickOKandtheimagehaschangedtothenewandimprovedimage.Thereisnolayeradjustmentforthevariationadjustment.HoweveraworkaroundtocreateanondestructiveadjustmentistoconvertyourimageforSmartfilters.FromtheFiltermenuchooseConvertforSmartFilter.Thiswillallowtheadditionoffiltersoradjustmentsthatwillnotdamageoraltertheoriginal.Thevariationadjustmentisthenonitsownlayerandcanbealteredordeleted.

Page8

SharpeningusingtheHighPassfilter

Openimagetobesharpened

Duplicatelayer

OntheDuplicate(copy)useFilter>Other>HighPass

o SettheRadiusto4

UseCtrl+Ltoopenthelevelsdialog

boxset1st Inputlevel(left)to75

andthe3rd(right)to180

ChooseBlendmodeOverlayandsetOpacityinthe2050%range

Page9

ClassExercisesExercises1FreeingtheBackgroundlayer

1. Openwindmill.jpg2. DoubleclickonthelayernameintheLayerspallet3. Renamethelayer4. Pressok

Exercises2Keystoning

1. OpenKeystoneCity.jpg2. FreethebackgroundlayerasinExercise13. GototheFilter>LensCorrection4. ClickontheCustomTab5. MovetheVerticalPerspectiveslidertotheleft

Exercises3Horizon

1. OpenBeachKid.jpg2. TurnonrulersView>Rulers3. FreethebackgroundlayerasinExercise14. Clickonthetopruleranddragaguidedownsothatitcrossesthehorizon5. RotatetheimagebygoingtoEdit>Transform>Rotate6. Clickanddragtherotationpointsothatitisatthepointwherethe

horizonandtheguidelineintersect7. Rotatetheimageuntilthehorizonisparallelwiththeguide8. Pressthecheckmarktoaccepttherotation9. Cropawaytheblankarea

Exercises4MaskinganAdjustmentlayer

1. OpenSunset.jpg2. FreethebackgroundlayerasinExercise13. FixthehorizonasinExercise34. Drawamarqueoverthesky5. Clickonrefineedgeandtraceoverthehorizonandtrees6. PressOK7. ReversetheselectionSelect>Inverse8. AddaCurvesadjustmentlayer9. MakeaslightScurvetolightentheland

Exercises5QuickColorFix

1. OpenCountMaxula.png2. DuplicateBackgroundLayer3. ChooseImage>AutoColor

Page10

Exercises6Variations1. OpenDoggie.png2. GotoFilter>ConvertforSmartFilter3. GotoImage>Adjustments>Variations4. Clickoncoloredimagestoadjustcolor

Exercises7CorrectingContrast1. Summerroad.png2. GotoLayer>NewAdjustmentLayer>Levels3. ChangetheblendingModetoMultiply4. PressOK5. Removeunusedareafromhistogrambyslidingthe

whitetriangletotheleftandtheblacktriangletotheright

Exercises8HighpassFilter1. OpenStatue.jpg2. DuplicateBackgroundLayer3. GotoFilter>Other>HighPass4. Settheradiustoabout1.2px5. PressOK6. ChangetheblendingModetoOverlay7. AddaVectorMask8. Invertthemaskbygoingto

Image>Adjustments>Invert9. UsethePaintbrushtoolandpaintwhiteoverthestatuesface

andhands10. Repeatsteps2611. InverttheimagebygoingtoImage>Adjustments>Invert12. RightclickonBackgroundCopysmaskandchooseAddmask

toselection13. SelectBackgroundcopy214. InvertselectionbygoingtoSelect>Inverse15. AddaVectorMask

Exercises9HighpassFilter1. OpenWomanHead.png2. GotoFile>Place3. ChoosePalmandSky.png4. Grabbingthecorners,resizethepalmtocoverLayer05. Pressthecheckmarktofinishplacingit6. MoverLayer0abovePalmandSkyintheLayersPalette7. UsetheQuickSelectTool(W)toselectthesky