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The ImageFileIO Module
TheImageFileIOmodulecanbeusedtoreadanimagefromasocket,oranyotherstream
device.
Thismoduleisdeprecated.NewcodeshouldusetheParserclassintheImageFilemodule
instead.
Functions
ImageFileIO
ImageFileIO.ImageFileIO(stream)
Addsbufferingtoastreamfileobject,inordertoprovideseekand
tellmethodsrequiredbytheImage.openmethod.Thestreamobject
mustimplementreadandclosemethods.
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The ImageFilter Module
TheImageFiltermodulecontainsdefinitionsforthepre-definedsetoffilters,tobeused
inconjuctionwiththefiltermethodoftheImageclass.
Example
Example:FilteranImage
import ImageFilter
imout = im.filter(ImageFilter.BLUR)
Filters
Thecurrentversionofthelibraryprovidesthefollowingsetofpredefinedimage
enhancementfilters:
BLUR,CONTOUR,DETAIL,EDGE_ENHANCE,EDGE_ENHANCE_MORE,EMBOSS,FIND_EDGES,
SMOOTH,SMOOTH_MORE,andSHARPEN.
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The ImageFont Module
TheImageFontmoduledefinesaclasswiththesamename.Instancesofthisclassstore
bitmapfonts,andareusedwiththetextmethodoftheImageDrawclass.
PILusesit'sownfontfileformattostorebitmapfonts.Youcanusethepilfontutilityto
convertBDFandPCFfontdescriptors(Xwindowfontformats)tothisformat.
TrueTypesupportisavailableaspartofthePILPluspackage.
Functions
load
ImageFont.load(file)=>Fontinstance
Loadsafontfromthegivenfile,andreturnsthecorrespondingfont
object.Ifthisfunctionfails,itraisesanIOErrorexception.
load
ImageFont.load_path(file)=>Fontinstance
Sameasload,butsearchesforthefilealongsys.pathifit'snotfound
inthecurrentdirectory.
Methods
ThefollowingmethodsareusedbytheImageDrawlayer.
getsize
font.getsize(text)=>(width,height)
Returnsthewidthandheightofthegiventext,asa2-tuple.
getmask
font.getmask(text)=>Imageobject
Returnsabitmapforthetext.ThebitmapshouldbeaninternalPIL
storagememoryinstance(asdefinedbythe_imaginginterface
module).
Ifthefontusesantialiasing,thebitmapshouldhavemode"L"andusea
maximumvalueof255.Otherwise,itshouldhavemode"1".
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The ImageGrab Module
(Newin1.1.3)TheImageGrabmodulecanbeusedtocopythecontentsofthescreentoa
PILimagememory.
ThecurrentversionworksonWindowsonly.
Functions
grab
ImageGrab.grab()=>image
ImageGrab.grab(bbox)=>image
Takeasnapshotofthescreen,andreturnan"RGB"image.The
boundingboxargumentcanbeusedtocopyonlyapartofthescreen.
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The ImageOps Module
(Newin1.1.3)TheImageOpsmodulecontainsanumberof'ready-made'imageprocessing
operations.Thismoduleissomewhatexperimental,andmostoperatorsonlyworkonLand
RGBimages.
Functions
autocontrast
ImageOps.autocontrast(image,cutoff=0)=>image
Maximize(normalize)imagecontrast.Thisfunctioncalculatesa
histogramoftheinputimage,removescutoffpercentofthelightest
anddarkestpixelsfromthehistogram,andremapstheimagesothat
thedarkestpixelbecomesblack(0),andthelightestbecomeswhite
(255).
colorize
ImageOps.colorize(image,black,white)=>image
Colorizegrayscaleimage.Theblackandwhiteargumentsshouldbe
RGBtuples;thisfunctioncalculatesacolourwedgemappingallblack
pixelsinthesourceimagetothefirstcolour,andallwhitepixelsto
thesecondcolour.
crop
ImageOps.crop(image,border=0)=>image
Removeborderpixelsfromallfouredges.Thisfunctionworksonall
imagemodes.
deform
ImageOps.deform(image,deformer)=>image
Deformtheimageusingthegivendeformerobject.
equalize
ImageOps.equalize(image)=>image
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Equalizetheimagehistogram.Thisfunctionappliesanon-linear
mappingtotheinputimage,inordertocreateauniformdistribution
ofgrayscalevaluesintheoutputimage.
expand
ImageOps.expand(image,border=0,fill=0)=>image
Addborderpixelsofbordertotheimage,atallfouredges.
fit
ImageOps.fit(image,size,method,bleed,centering)=>image
Returnsasizedandcroppedversionoftheimage,croppedtothe
requestedaspectratioandsize.Thesizeargumentistherequested
outputsizeinpixels,givenasa(width,height)tuple.
Themethodargumentiswhatresamplingmethodtouse.Thedefaultis
Image.NEAREST(nearestneighbour).
Thebleedargumentallowsyoutoremoveaborderaroundtheoutside
theimage(fromallfouredges).Thevalueisadecimalpercentage(use
0.01foronepercent).Thedefaultvalueis0(noborder).
Thecenteringargumentisusedtocontrolthecroppingposition.(0.5,
0.5)iscentercropping(i.e.ifcroppingthewidth,take50%offofthe
leftside(andtherefore50%offtherightside),andsamewith
top/bottom).
(0.0,0.0)willcropfromthetopleftcorner(i.e.ifcroppingthewidth,
takeallofthecropoffoftherightside,andifcroppingtheheight,
takeallofitoffthebottom).
(1.0,0.0)willcropfromthebottomleftcorner,etc.(i.e.ifcropping
thewidth,takeallofthecropofftheleftside,andifcroppingthe
heighttakenonefromthetop(andthereforealloffthebottom)).
ThefitfunctionwascontributedbyKevinCazabon.
flip
ImageOps.flip(image)=>image
Fliptheimagevertically(toptobottom).
grayscale
ImageOps.grayscale(image)=>image
Converttheimagetograyscale.
invert
ImageOps.invert(image)=>image
Invert(negate)theimage.
mirror
ImageOps.mirror(image)=>image
Flipimagehorizontally(lefttoright).
posterize
ImageOps.posterize(image,bits)=>image
Reducethenumberofbitsforeachcolourchannel.
solarize
ImageOps.solarize(image,threshold=128)=>image
Invertallpixelvaluesabovethegiventhreshold.
The ImagePath Module
TheImagePathmoduleisusedtostoreandmanipulate2-dimensionalvectordata.Path
objectscanbepassedtothemethodsintheImageDrawmodule.
Functions
Path
ImagePath.Path(coordinates)=>Pathinstance
Createsapathobject.Thecoordinatelistcanbeanysequenceobject
containingeither2-tuples[(x,y),...]ornumericvalues[x,y,...].
The ImageSequence Module
TheImageSequencemodulecontainsawrapperclassthatprovidesiterationoverthe
framesofanimagesequence.
Functions
Iterator
ImageSequence.Iterator(image)=>Iteratorinstance
CreatesanIteratorinstancethatletsyouloopoverallframesina
sequence.
Methods
TheIteratorclassimplementsthefollowingmethod:
The[]Operator
Youcancallthisoperatorwithintegervaluesfrom0andupwards.It
raisesanIndexErrorexceptionwhentherearenomoreframes.
The ImageStat Module
TheImageStatmodulecalculatesglobalstatisticsforanimage,oraregionofanimage.
Functions
Stat
ImageStat.Stat(image)=>Statinstance
ImageStat.Stat(image,mask)=>Statinstance
Calculatesstatisticsforthegiveimage.Ifamaskisincluded,onlythe
regionscoveredbythatmaskareincludedinthestatistics.
ImageStat.Stat(list)=>Statinstance
Sameasabove,butcalculatesstatisticsforapreviouslycalculated
histogram.
Attributes
Thefollowingattributescontainasequencewithoneelementforeachlayerintheimage.
Allattributesarelazilyevaluated;ifyoudon'tneedavalue,itwon'tbecalculated.
extrema
stat.extrema
(Attribute).Getmin/maxvaluesforeachbandintheimage.
count
stat.count
(Attribute).Gettotalnumberofpixels.
sum
stat.sum
(Attribute).Getsumofallpixels.
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