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Hack 32. Shrink Your Presentation for Easy Sharing

Hack 32. Shrink Your Presentation for Easy Sharing

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thenumberofcolors.

FindtheOptimumImageTypeandCompressionQuality

PhotosareoftenbestsavedasJPEGs



Therearemanyimageformatsyoucanchoosefrom.TheJPEG

formatisgoodforphotosandcertainimageswithcomplex

multicolorshapes,asshowninFigure4-5.Yourphotoeditor

mayofferyoudifferentqualitysettingsforsaving,sochoose

thelowestqualitythatyou'recomfortablewith;don'tgotoolow

onthequality,oryourphotowillcontainthekindofheavyJPEG

artifactsshowninFigure4-6.Notethatifyoursourcefile

alreadycontainsheavyJPEGnoise,youcannotremoveitby

justresavingwithahigherqualitysetting.



NOTE

AvoidflatredcolorareaswhensavingasJPEG.This

particularimagecompressionalgorithmoftencreates

heavy,noisyartifactsforred.

TheJPEGqualitysettingsforsavingthisphotoweretoo

low,creatinganunpleasantendresult



ThePNGformatisoptimizedforlineart,certaintypesof

screenshotsthatdon'tcontainlargephotos,andotherless

"complex"pictures,asshowninFigure4-7.PNGisaso-called

losslesscompressionformat,sotheimagedoesn'tlosedetail

whenit'ssaved;JPEG,ontheotherhand,willtypicallylosea

bitofitsqualityeverytimeyousaveitwithdifferent



compressionsettings.TobetterhelpthePNGcompression

reduceyourfilesize,youcanalsoreducethenumberofcolors

inyourimageto256(alsoknownas8-bit).Yourimageediting

programshouldallowyoutodothis.

GIFisabitofanolderformat,similartoPNGfiles;here,the

reductionto256colors—or16colors,or2—isamust.Inmost

circumstances,youshouldchoosePNGoverGIF.GIFallows

onlyasingletransparentcolorfromthepalette,whereasPNG

supportsvaryingrangesoftransparency.



ScreenshotsoftenfarewellwhensavedasPNGs



Ifindoubtaboutwhichimagetypetochoose,trygoingforPNG

firstandcheckwhethertheimagefilesizeisacceptable;ifthe

imageendsupbelow40KB,forinstance,thiswilldofinefor

mostpurposes.IfthePNGendsupbeingtoolarge,trytosave

asJPEGinsteadandcomparefilesizes.



NOTE

SomeofGoogle'spresentationthemesusebackground

images,liketheGrassorRusticthemes.Althoughthese

imagesaren'tdramaticallybig,ifyouwanttofine-tune

yourpresentationforbestperformance,youcanalso

useathemethatdoesn'tuseabackgroundimage.

GoodResizingandColorReduction

Therearedifferentwaystoresizeanimage,andtoreduceits

colors(usefulforthePNGandGIFformats).Notethatthe



terminologyforthesevariesfromoneimageeditortothenext,

buttheunderlyingapproachesaresimilar.

Resizingversusresampling:Sometimeswhendownsizing

theresolutionofaphoto,youareofferedtoresizeit,orto

resampleit.Resamplingreturnssmootherresults,asit

"merges"thecolorsofadjacentpixels.Itmayonlybeofferedin

yourphotoeditoriftheimageyouareworkingonusesmore

than256colors;convertyourimagetoahigh-colorformatfirst

ifthat'snotthecase.Afterresampling,youcandecreasethe

amountofcolorsagainbeforesaving.

Ditheringversusnondithered:Whenyoureducethenumber

ofcolorsforanimage,yourphotoretouchingapplicationmay

offeryoudifferentmethodsforthis.Oneofthemiscalled

ditheringorerrordiffusion.Thismeansthata"colorspray"

effectisusedtocreatetheimpressionofahighercolorrange.

Forinstance,ifyouwantedtoconvertanimagewithahigh

rangeofgraytonestoablackandwhiteimage,intermingling

blackandwhitepixelscouldbeusedtocreatetheimpressionof

differenttonesofgray,asshowninFigure4-8.Althoughin

general,ditheringcreatessmootherresults,itcanalsobe

detrimentaltothefilesize,asPNGandGIFcompression

algorithmsarebetteratoptimizinglargersame-colorareas.

Atwo-colorimagecanuseditheringtoemulategray

areas



Hack33.UsePowerPointTemplates

LoadapresentationtemplateintoGoogleDocs.Anddon'ttake

thewrongfileextensionfora"no."

Whenyouexportapresentation,youcantweaktheimagesand

stylesheetstofityourneeds[Hack#30].Butifyouhavea

PowerPointtemplatethatyouwanttouse(orifyoufindone

online),there'sawaytoimportthoseintoGoogle

Presentations.

Tofindatheme,searchtheWebforkeywordssuchas

powerpointthemesorpowerpointtemplates.Forexample,one

sitethatpoppedupduringmysearchwas

http://brainybetty.com/MENUPowerPoint.htm,whichoffersfree

ZIPfilesofMicrosoftPowerPointpresentationtemplates.AfterI

downloadedandunzippedthem,Ifoundthattheycontained

fileswiththe.potextension(likeBusinessIII.pot).

GooglePresentationsdoesn'tofficiallysupportPowerPoint

templates,butifyoumakeitthinkthatthefileisaPowerPoint

document,youcangetittoload.Changethefile's.pot

(PowerPointTemplate)extensionto.ppt(PowerPoint

Document),openupGoogleDocs,andclicktheUploadbutton.

Browseforyour.pptfile,hitUploadFile,andwaitabit.Your

presentationwillnowconsistoftwoorsoslides,andyoucan

multiplyanyslidebyright-clickingaslidethumbnailand

selecting"Duplicateslide"fromthecontextmenu,asshownin

Figure4-9.



NOTE

IfyouhaveMicrosoftPowerPointorOpenOffice.org

availableonyourlocalcomputer,youcancreateanew

blankpresentation,pickatemplateofyourchoosing,

andthensavethedocumentasa.ppt.Thenyoucan

importitintoGooglePresentations.



APowerPointtemplatefromBrainyBetty.comimported

intoGooglePresentations



Hack34.ViewYourPresentationona

MobilePhone

Wanttotakeapresentationwithyou?

Asofthiswriting,Googledidnotofferawaytoview

presentationsonamobilephone.However,manymobile

devices,especiallyso-called"smartphones,"canviewPDFfiles.

Ifyou'vegotamobiledevicethatsupportsPDF,youcan

generateaPDFversionofyourpresentationbyselectingFile

ExportasPDF,andthensendthePDFtoyourphoneusing

Bluetooth,thesynchronizationsoftwarethatcamewithyour

phone,orbyputtingitonthephone'smemorycard.Figure410showsaGooglePresentationPDFonaNokiaSeries60

mobilephone.

ThereisatleastonemobiledevicethatcanviewPDFs,but

whichhasnouser-accessiblefilestorage:theiPhone.Toviewa

PDFontheiPhone,youcaneitherpostthePDFonawebsite

thatyoulateraccesswithyouriPhone'swebbrowser,oremailit

tooneoftheemailaccountsyoucanreadonyouriPhone.

IfyourmobiledevicedoesnotsupportPDF,youmaystillbe

abletoviewit.Thepdftohtmlutility(see

http://pdftohtml.sourceforge.net)canconvertPDFfilesto

HTML.ThisutilitywillturnaPDFintoacollectionofHTMLand

imagefilesthatyoucantransfertoawebserverandviewfrom

anyHTML-capabledevice.You'llneedtoexperimentwith

pdftohtml'ssettingstooptimizethegeneratedHTMLtofitthe

capabilitiesofyourmobiledevice.

—BrianJepson

Viewingapresentationonthego(the34%indicatesthe

documentscale)



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