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rotate
im.rotate(angle)=>image
im.rotate(angle,filter)=>image
Returnsacopyofanimagerotatedthegivennumberofdegrees
counterclockwisearounditscentre.
ThefilterargumentcanbeoneofNEAREST(usenearestneighbour),
BILINEAR(linearinterpolationina2x2environment),orBICUBIC(cubic
splineinterpolationina4x4environment).Ifomitted,oriftheimage
hasmode"1"or"P",itissettoNEAREST.
save
im.save(outfile,options)
im.save(outfile,format,options)
Savestheimageunderthegivenfilename.Ifformatisomitted,the
formatisdeterminedfromthefilenameextension,ifpossible.This
methodreturnsNone.
Keywordoptionscanbeusedtoprovideadditionalinstructionstothe
writer.Ifawriterdoesn'trecogniseanoption,itissilentlyignored.
Theavailableoptionsaredescribedlaterinthishandbook.
Youcanuseafileobjectinsteadofafilename.Inthiscase,youmust
alwaysspecifytheformat.Thefileobjectmustimplementtheseek,
tell,andwritemethods,andbeopenedinbinarymode.
seek
im.seek(frame)
Seekstothegivenframeinasequencefile.Ifyouseekbeyondtheend
ofthesequence,themethodraisesanEOFErrorexception.Whena
sequencefileisopened,thelibraryautomaticallyseekstoframe0.
Notethatinthecurrentversionofthelibrary,mostsequenceformats
onlyallowsyoutoseektothenextframe.
show
im.show()
Displaysanimage.Thismethodismainlyintendedfordebugging
purposes.
OnUnixplatforms,thismethodsavestheimagetoatemporaryPPM
file,andcallsthexvutility.
OnWindows,itsavestheimagetoatemporaryBMPfile,andusesthe
standardBMPdisplayutilitytoshowit(usuallyPaint).
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ThismethodreturnsNone.
split
im.split()=>sequence
Returnsatupleofindividualimagebandsfromanimage.Forexample,
splittingan"RGB"imagecreatesthreenewimageseachcontaininga
copyofoneoftheoriginalbands(red,green,blue).
tell
im.tell()=>integer
Returnsthecurrentframenumber.
thumbnail
im.thumbnail(size)
im.thumbnail(size,filter)
Modifiestheimagetocontainathumbnailversionofitself,nolarger
thanthegivensize.Thismethodcalculatesanappropriatethumbnail
sizetopreservetheaspectoftheimage,callsthedraftmethodto
configurethefilereader(whereapplicable),andfinallyresizesthe
image.
ThefilterargumentcanbeoneofNEAREST,BILINEAR,BICUBIC,or
ANTIALIAS(bestquality).Ifomitted,itdefaultstoNEAREST(thiswill
bechangedtoANTIALIASinfutureversions).
NotethatthebilinearandbicubicfiltersinthecurrentversionofPIL
arenotwell-suitedforthumbnailgeneration.Youshoulduse
ANTIALIASunlessspeedismuchmoreimportantthanquality.
AlsonotethatthisfunctionmodifiestheImageobjectinplace.Ifyou
needtousethefullresolutionimageaswell,applythismethodtoa
copyoftheoriginalimage.ThismethodreturnsNone.
tobitmap
im.tobitmap()=>string
ReturnstheimageconvertedtoanX11bitmap.
tostring
im.tostring()=>string
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RasterEdge.XDoc.PDF.dll. FileType.IMG_JPEG); switch (result) { case ConvertResult. NO_ERROR: Console.WriteLine("Success"); break; case ConvertResult
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Returnsastringcontainingpixeldata,usingthestandard"raw"
encoder.
im.tostring(encoder,parameters)=>string
Returnsastringcontainingpixeldata,usingthegivendataencoding.
transform
im.transform(size,method,data)=>image
im.transform(size,method,data,filter)=>image
Createsanewimagewiththegivensize,andthesamemodeasthe
original,andcopiesdatatothenewimageusingthegiventransform.
InthecurrentversionofPIL,themethodargumentcanbeEXTENT
(cutoutarectangularsubregion),AFFINE(affinetransform),QUAD
(mapaquadrilateraltoarectangle),orMESH(mapanumberofsource
quadrilateralsinoneoperation).Thevariousmethodsaredescribed
below.
Thefilterargumentdefineshowtofilterpixelsfromthesourceimage.
Inthecurrentversion,itcanbeNEAREST(usenearestneighbour),
BILINEAR(linearinterpolationina2x2environment),orBICUBIC(cubic
splineinterpolationina4x4environment).Ifomitted,oriftheimage
hasmode"1"or"P",itissettoNEAREST.
im.transform(size,EXTENT,data)=>image
im.transform(size,EXTENT,data,filter)=>image
Extractsasubregionfromtheimage.
Dataisa4-tuple(x0,y0,x1,y1)whichspecifiestwopointsintheinput
image'scoordinatesystem.Theresultingimagewillcontaindata
sampledfrombetweenthesetwopoints,suchthat(x0,y0)intheinput
imagewillendupat(0,0)intheoutputimage,and(x1,y1)atsize.
Thismethodcanbeusedtocrop,stretch,shrink,ormirroranarbitrary
rectangleinthecurrentimage.Itisslightlyslowerthancrop,but
aboutasfastasacorrespondingresizeoperation.
im.transform(size,AFFINE,data)=>image
im.transform(size,AFFINE,data,filter)=>image
Appliesanaffinetransformtotheimage,andplacestheresultina
newimagewiththegivensize.
Dataisa6-tuple(a,b,c,d,e,f)whichcontainthefirsttworowsfrom
anaffinetransformmatrix.Foreachpixel(x,y)intheoutputimage,
thenewvalueistakenfromaposition(ax+by+c,dx+ey+f)in
theinputimage,roundedtonearestpixel.
Thisfunctioncanbeusedtoscale,translate,rotate,andshearthe
originalimage.
im.transform(size,QUAD,data)=>image
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im.transform(size,QUAD,data,filter)=>image
Mapsaquadrilateral(aregiondefinedbyfourcorners)fromtheimage
toarectanglewiththegivensize.
Dataisan8-tuple(x0,y0,x1,y1,x2,y2,y3,y3)whichcontainthe
upperleft,lowerleft,lowerright,andupperrightcornerofthesource
quadrilateral.
im.transform(size,MESH,data)image=>image
im.transform(size,MESH,data,filter)image=>image
SimilartoQUAD,butdataisalistoftargetrectanglesand
correspondingsourcequadrilaterals.
transpose
im.transpose(method)=>image
Returnsaflippedorrotatedcopyofanimage.
Methodcanbeoneofthefollowing:FLIP_LEFT_RIGHT,
FLIP_TOP_BOTTOM,ROTATE_90,ROTATE_180,orROTATE_270.
verify
im.verify()
Attemptstodetermineifthefileisbroken,withoutactuallydecoding
theimagedata.Ifthismethodfindsanyproblems,itraisessuitable
exceptions.Ifyouneedtoloadtheimageafterusingthismethod,you
mustreopentheimagefile.
Attributes
InstancesoftheImageclasshavethefollowingattributes:
format
im.format (stringorNone)
Thefileformatofthesourcefile.Forimagescreatedbythelibrary,
thisattributeissettoNone.
mode
im.mode (string)
Imagemode.Thisisastringspecifyingthepixelformatusedbythe
image.Typicalvaluesare"1", "L","RGB",or"CMYK."
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device.TwainTransferMode = method; break; } if (method == TwainTransferMethod.TWSX_FILE) device.TransferMethod = method; } // If it's not supported tell stop.
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RasterEdge.XDoc.PDF.dll. device.TwainTransferMode = method; break; } if (method == TwainTransferMethod.TWSX_FILE) device.TransferMethod = method; } // If it's
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size
im.size ((width,height))
Imagesize,inpixels.Thesizeisgivenasa2-tuple(width,height).
palette
im.palette (paletteorNone)
Colourpalettetable,ifany.Ifmodeis"P",thisshouldbeaninstance
oftheImagePaletteclass.Otherwise,itshouldbesettoNone.
info
im.info (dictionary)
Adictionaryholdingdataassociatedwiththeimage.
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foreach (TwainStaticFrameSizeType frame in frames) { if (frame == TwainStaticFrameSizeType.LetterUS) { this.device.FrameSize = frame; break; } } }.
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RasterEdge.XDoc.PDF.dll. if (device.Compression != TwainCompressionMode.Group4) device.Compression = TwainCompressionMode.Group3; break; } } acq.FileTranfer
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TheImageChopsModule
TheImageChopsmodulecontainsanumberofarithmeticalimageoperations,called
channeloperations("chops").Thesecanbeusedforvariouspurposes,includingspecial
effects,imagecompositions,algorithmicpainting,andmore.
Atthistime,channeloperationsareonlyimplementedfor8-bitimages(e.g."L"and
"RGB").
Functions
Mostchanneloperationstakeoneortwoimageargumentsandreturnsanewimage.
Unlessotherwisenoted,theresultofachanneloperationisalwaysclippedtotherange0
toMAX(whichis255forallmodessupportedbytheoperationsinthismodule).
constant
ImageChops.constant(image,value)=>image
Returnalayerwiththesamesizeasthegivenimage,butfilledwith
thegivenpixelvalue.
duplicate
ImageChops.duplicate(image)=>image
Returnacopyofthegivenimage.
invert
ImageChops.invert(image)=>image
Invertsanimage.
out = MAX - image
lighter
ImageChops.lighter(image1,image2)=>image
Comparesthetwoimages,pixelbypixel,andreturnsanewimage
containingthelightervalues.
out = max(image1, image2)
darker
ImageChops.darker(image1,image2)=>image
Comparesthetwoimages,pixelbypixel,andreturnsanewimage
containingthedarkervalues.
out = min(image1, image2)
difference
ImageChops.difference(image1,image2)=>image
Returnstheabsolutevalueofthedifferencebetweenthetwoimages.
out = abs(image1 - image2)
multiply
ImageChops.multiply(image1,image2)=>image
Superimposestwoimagesontopofeachother.Ifyoumultiplyan
imagewithasolidblackimage,theresultisblack.Ifyoumultiplywith
asolidwhiteimage,theimageisunaffected.
out = image1 * image2 / MAX
screen
ImageChops.screen(image1,image2)=>image
Superimposestwoinvertedimagesontopofeachother.
out = MAX - ((MAX - image1) * (MAX - image2) / MAX)
add
ImageChops.add(image1,image2,scale,offset)=>image
Addstwoimages,dividingtheresultbyscaleandaddingtheoffset.If
omitted,scaledefaultsto1.0,andoffsetto0.0.
out = (image1 + image2) / scale + offset
subtract
ImageChops.subtract(image1,image2,scale,offset)=>image
Subtractstwoimages,dividingtheresultbyscaleandaddingthe
offset.Ifomitted,scaledefaultsto1.0,andoffsetto0.0.
out = (image1 - image2) / scale + offset
blend
ImageChops.blend(image1,image2,alpha)=>image
SameastheblendfunctionintheImagemodule.
composite
ImageChops.composite(image1,image2,mask)=>image
SameasthecompositefunctionintheImagemodule.
offset
ImageChops.offset(xoffset,yoffset)=>image
ImageChops.offset(offset)=>image
Returnsacopyoftheimagewheredatahasbeenoffsetbythegiven
distances.Datawrapsaroundtheedges.Ifyoffsetisomitted,itis
assumedtobeequaltoxoffset.
TheImageCrackCodeModule(PILPlus)
TheImageCrackCodemoduleallowsyoutodetectandmeasurefeaturesinanimage.This
moduleisonlyavailableinthePILPluspackage.
Functions
CrackCode
CrackCode(image,position)=>CrackCodeinstance
Identifiesafeatureinthegivenimage.Ifthepositionisomitted,the
constructorsearchesfromthetopleftcorner.
Methodsandattributes
area
cc.area
(attribute).Thefeaturearea,inpixels.
bbox
cc.bbox
(attribute).Theboundingbox,givenasa4-tuple(left,upper,right,
lower).
caliper
cc.caliper
(attribute).Thecalipersize,givenasa2-tuple(height,width).
centroid
cc.centroid
(attribute).Thecenterofgravity.
edge
cc.edge
(attribute).Trueifthefeaturetouchestheedgesoftheimage,zero
otherwise.
links
cc.links
(attribute).Thenumberoflinksinthecrackcodechain.
offset
cc.offset
(attribute).Theoffsetfromtheupperleftcorneroftheimage,tothe
feature'sboundingbox,
start
cc.start
(attribute).Thefirstcoordinateinthecrackcodechain.
top
cc.top
(attribute).Thetopmostcoordinateinthecrackcodechain.
hit
cc.hit(xy)=>flag
Checkifthegivenpointisinsidethisfeature.
topath
cc.topath(xy)=>path
ReturncrackcodeoutlineasanImagePathobject.
getmask
cc.getmask()=>image
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