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Getfilledfeaturemask,asanimageobject.
getoutline
cc.getoutline()=>image
Getfeatureoutline,asanimageobject.
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TheImageDrawModule
TheImageDrawmoduleprovidebasicgraphicssupportforImageobjects.Itcanfor
examplebeusedtocreatenewimages,annotateorretouchexistingimages,andto
generategraphicsontheflyforwebuse.
Example
Example:DrawaGreyCrossOveranImage
import Image, ImageDraw
im = Image.open("lena.pgm")
draw = ImageDraw.Draw(im)
draw.line((0, 0) + im.size, fill=128)
draw.line((0, im.size[1], im.size[0], 0), fill=128)
del draw 
# write to stdout
im.save(sys.stdout, "PNG")
Functions
Draw
Draw(image)=>Drawinstance
Createsanobjectthatcanbeusedtodrawinthegivenimage.
Notethattheimagewillbemodifiedinplace.
Methods
arc
draw.arc(xy,start,end,options)
Drawsanarc(aportionofacircleoutline)betweenthestartandend
angles,insidethegivenboundingbox.
Theoutlineoptiongivesthecolourtouseforthearc.
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bitmap
draw.bitmap(xy,bitmap,options)
Drawsabitmapatthegivenposition,usingthecurrentfillcolour.
chord
draw.chord(xy,start,end,options)
Sameasarc,butconnectstheendpointswithastraightline.
Theoutlineoptiongivesthecolourtouseforthechordoutline.The
filloptiongivesthecolourtouseforthechordinterior.
ellipse
draw.ellipse(xy,options)
Drawsanellipseinsidethegivenboundingbox.
Theoutlineoptiongivesthecolourtousefortheellipseoutline.The
filloptiongivesthecolourtousefortheellipseinterior.
line
draw.line(xy,options)
Drawsalinebetweenthecoordinatesinthexylist.
Thecoordinatelistcanbeanysequenceobjectcontainingeither
2-tuples[(x,y),...]ornumericvalues[x,y,...].Itshouldcontain
atleasttwocoordinates.
Thefilloptiongivesthecolourtousefortheline.
pieslice
draw.pieslice(xy,start,end,options)
Sameasarc,butalsodrawsstraightlinesbetweentheendpointsand
thecenteroftheboundingbox.
Theoutlineoptiongivesthecolourtouseforthepiesliceoutline.The
filloptiongivesthecolourtouseforthepiesliceinterior.
point
draw.point(xy,options)
Drawspoints(individualpixels)atthegivencoordinates.
Thecoordinatelistcanbeanysequenceobjectcontainingeither
2-tuples[(x,y),...]ornumericvalues[x,y,...].
Thefilloptiongivesthecolourtouseforthepoints.
polygon
draw.polygon(xy,options)
Drawsapolygon.
Thepolygonoutlineconsistsofstraightlinesbetweenthegiven
coordinates,plusastraightlinebetweenthelastandthefirst
coordinate.
Thecoordinatelistcanbeanysequenceobjectcontainingeither
2-tuples[(x,y),...]ornumericvalues[x,y,...].Itshouldcontain
atleastthreecoordinates.
Theoutlineoptiongivesthecolourtouseforthepolygonoutline.The
filloptiongivesthecolourtouseforthepolygoninterior.
rectangle
draw.rectangle(box,options)
Drawsarectangle.
Theboxcanbeanysequenceobjectcontainingeither2-tuples[(x,y),
(x,y)]ornumericvalues[x,y,x,y].Itshouldcontaintwo
coordinates.
Notethatthesecondcoordinatepairdefinesapointjustoutsidethe
rectangle,alsowhentherectangleisnotfilled.
Theoutlineoptiongivesthecolourtousefortherectangleoutline.
Thefilloptiongivesthecolourtousefortherectangleinterior.
text
draw.text(position,string,options)
Drawsthestringatthegivenposition.Thepositiongivestheupper
rightcornerofthetext.
Thefontoptionisusedtospecifywhichfonttouse.Itshouldbean
instanceoftheImageFontclass,typicallyloadedfromfileusingthe
loadmethodintheImageFontmodule.
Thefilloptiongivesthecolourtouseforthetext.
textsize
draw.textsize(string,options)=>(width,height)
Returnthesizeofthegivenstring,inpixels.
Thefontoptionisusedtospecifywhichfonttouse.Itshouldbean
instanceoftheImageFontclass,typicallyloadedfromfileusingthe
loadmethodintheImageFontmodule.
Options
outline (integerortuple)
fill (integerortuple)
font (ImageFontinstance)
Compatibility
TheDrawclasscontainsaconstructorandanumberofmethodswhichareprovidedfor
backwardscompatibilityonly.Forthistoworkproperly,youshouldeitheruseoptionson
thedrawingprimitives,orthesemethods.Donotmixtheoldandnewcallingconventions.
ImageDraw
ImageDraw(image)=>Drawinstance
(Deprecated).SameasDraw.Don'tusethisnameinnewcode.
setink
draw.setink(ink)
(Deprecated).Setsthecolourtouseforsubsequentdrawandfill
operations.
setfill
draw.setfill(mode)
(Deprecated).Setsthefillmode.
Ifthemodeis0,subsequentlydrawnshapes(likepolygonsand
rectangles)areoutlined.Ifthemodeis1,theyarefilled.
setfont
draw.setfont(font)
(Deprecated).Setsthedefaultfonttouseforthetextmethod.
ThefontargumentshouldbeaninstanceoftheImageFontclass,
typicallyloadedfromfileusingtheloadmethodintheImageFont
module.
TheImageEnhanceModule
TheImageEnhancemodulecontainsanumberofclassesthatcanbeusedforimage
enhancement.
Example
Example:VarytheSharpnessofanImage
import ImageEnhance
enhancer = ImageEnhance.Sharpness(image)
for i in range(8):
factor = i / 4.0
enhancer.enhance(factor).show("Sharpness %f" % factor)
Seetheenhancer.pydemoprogramintheScriptsdirectory.
Interface
Allenhancementclassesimplementacommoninterface,containingasinglemethod:
enhance
enhancer.enhance(factor)=>image
Returnsanenhancedimage.Thefactorisafloatingpointvalue
controllingtheenhancement.Factor1.0alwaysreturnsacopyofthe
originalimage,lowerfactorsmeanlesscolour(brightness,contrast,
etc),andhighervaluesmore.Therearenorestrictionsonthisvalue.
TheColorClass
Thecolourenhancementclassisusedtoadjustthecolourbalanceofanimage,ina
mannersimilartothecontrolsonacolourTVset.Thisclassimplementstheenhancement
interfaceasdescribedabove.
Color
ImageEnhance.Color(image)=>Colorenhancerinstance
Createsanenhancementobjectforadjustingcolourinanimage.A
factorof0.0givesablackandwhiteimage,afactorof1.0givesthe
originalimage.
TheBrightnessClass
Thebrightnessenhancementclassisusedtocontrolthebrightnessofanimage.
Brightness
ImageEnhance.Brightness(image)=>Brightnessenhancerinstance
Createsanenhancementobjectforadjustingbrightnessinanimage.A
factorof0.0givesablackimage,factor1.0givestheoriginalimage.
TheContrastClass
Thecontrastenhancementclassisusedtocontrolthecontrastofanimage,similartothe
contrastcontrolonaTVset.
Contrast
ImageEnhance.Contrast(image)=>Contrastenhancerinstance
Createsanenhancementobjectforadjustingcontrastinanimage.A
factorof0.0givesansolidgreyimage,factor1.0givestheoriginal
image.
TheSharpnessClass
Thesharpnessenhancementclassisusedtocontrolthesharpnessofanimage.
Sharpness
ImageEnhance.Sharpness(image)=>Sharpnessenhancerinstance
Createsanenhancementobjectforadjustingthesharpnessofan
image.Thefactor0.0givesablurredimage,1.0givestheoriginal
image,andafactorof2.0givesasharpenedimage.
TheImageFileModule
TheImageFilemoduleprovidessupportfunctionsfortheimageopenandsavefunctions.
Inaddition,itprovidesaParserclasswhichcanbeusedtodecodeanimagepieceby
piece(e.g.whilereceivingitoveranetworkconnection).Thisclassimplementsthesame
consumerinterfaceasthestandardsgmllibandxmllibmodules.
Example
Example:ParseAnImage
import ImageFile
fp = open("lena.pgm", "rb")
p = ImageFile.Parser()
while 1:
s = fp.read(1024)
if not s:
break
p.feed(s)
im = p.close()
im.save("copy.jpg")
Functions
Parser
ImageFile.Parser()=>Parserinstance
Createsaparserobject.Parserscannotbereused.
Methods
feed
parser.feed(data)
Feedastringofdatatotheparser.ThismethodmayraiseanIOError
exception.
close
parser.close()=>imageorNone
Tellstheparsertofinishdecoding.Iftheparsermanagedtodecodean
image,itreturnsanImageobject.Otherwise,thismethodraisesan
IOErrorexception.
Note:IfthefilecannotbeidentifiedtheparserwillraiseanIOError
exceptionintheclosemethod.Ifthefilecanbeidentified,butnot
decoded(forexample,ifthedataisdamaged,orifitusesan
unsupportedcompressionmethod),theparserwillraiseanIOError
exceptionassoonaspossible,eitherinfeedorclose.
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