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Commit709ca90

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gh-118271: Support more options for reading/writing images in Tkinter (GH-118273)
* Add PhotoImage.read() to read an image from a file.* Add PhotoImage.data() to get the image data.* Add background and grayscale parameters to PhotoImage.write().
1 parentfc50f1b commit709ca90

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4 files changed

+222
-16
lines changed

4 files changed

+222
-16
lines changed

‎Doc/whatsnew/3.13.rst

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -891,6 +891,12 @@ tkinter
891891
:meth:`!copy()`.
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(Contributed by Serhiy Storchaka in:gh:`118225`.)
893893

894+
* Add the:class:`!PhotoImage` methods:meth:`!read` to read
895+
an image from a file and:meth:`!data` to get the image data.
896+
Add *background* and *grayscale* parameters to:class:`!PhotoImage` method
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:meth:`!write`.
898+
(Contributed by Serhiy Storchaka in:gh:`118271`.)
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894900
traceback
895901
---------
896902

‎Lib/test/test_tkinter/test_images.py

Lines changed: 101 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -505,6 +505,50 @@ def test_get(self):
505505
self.assertRaises(tkinter.TclError,image.get,16,15)
506506
self.assertRaises(tkinter.TclError,image.get,15,16)
507507

508+
deftest_read(self):
509+
# Due to the Tk bug https://core.tcl-lang.org/tk/tktview/1576528
510+
# the -from option does not work correctly for GIF and PNG files.
511+
# Use the PPM file for this test.
512+
testfile=support.findfile('python.ppm',subdir='tkinterdata')
513+
image=tkinter.PhotoImage(master=self.root,file=testfile)
514+
515+
image2=tkinter.PhotoImage(master=self.root)
516+
image2.read(testfile)
517+
self.assertEqual(image2.type(),'photo')
518+
self.assertEqual(image2.width(),16)
519+
self.assertEqual(image2.height(),16)
520+
self.assertEqual(image2.get(0,0),image.get(0,0))
521+
self.assertEqual(image2.get(4,6),image.get(4,6))
522+
523+
self.assertRaises(tkinter.TclError,image2.read,self.testfile,'ppm')
524+
525+
image2=tkinter.PhotoImage(master=self.root)
526+
image2.read(testfile,from_coords=(2,3,14,11))
527+
self.assertEqual(image2.width(),12)
528+
self.assertEqual(image2.height(),8)
529+
self.assertEqual(image2.get(0,0),image.get(2,3))
530+
self.assertEqual(image2.get(11,7),image.get(13,10))
531+
self.assertEqual(image2.get(2,4),image.get(2+2,4+3))
532+
533+
image2=tkinter.PhotoImage(master=self.root,file=testfile)
534+
self.assertEqual(image2.width(),16)
535+
self.assertEqual(image2.height(),16)
536+
image2.read(testfile,from_coords=(2,3,14,11),shrink=True)
537+
self.assertEqual(image2.width(),12)
538+
self.assertEqual(image2.height(),8)
539+
self.assertEqual(image2.get(0,0),image.get(2,3))
540+
self.assertEqual(image2.get(11,7),image.get(13,10))
541+
self.assertEqual(image2.get(2,4),image.get(2+2,4+3))
542+
543+
image2=tkinter.PhotoImage(master=self.root)
544+
image2.read(testfile,from_coords=(2,3,14,11),to=(3,6))
545+
self.assertEqual(image2.type(),'photo')
546+
self.assertEqual(image2.width(),15)
547+
self.assertEqual(image2.height(),14)
548+
self.assertEqual(image2.get(0+3,0+6),image.get(2,3))
549+
self.assertEqual(image2.get(11+3,7+6),image.get(13,10))
550+
self.assertEqual(image2.get(2+3,4+6),image.get(2+2,4+3))
551+
508552
deftest_write(self):
509553
filename=os_helper.TESTFN
510554
importlocale
@@ -516,26 +560,78 @@ def test_write(self):
516560

517561
image.write(filename)
518562
image2=tkinter.PhotoImage('::img::test2',master=self.root,
519-
format='ppm',
520-
file=filename)
563+
format='ppm',file=filename)
521564
self.assertEqual(str(image2),'::img::test2')
522565
self.assertEqual(image2.type(),'photo')
523566
self.assertEqual(image2.width(),16)
524567
self.assertEqual(image2.height(),16)
525568
self.assertEqual(image2.get(0,0),image.get(0,0))
526-
self.assertEqual(image2.get(15,8),image.get(15,8))
569+
self.assertEqual(image2.get(4,6),image.get(4,6))
527570

528571
image.write(filename,format='gif',from_coords=(4,6,6,9))
529572
image3=tkinter.PhotoImage('::img::test3',master=self.root,
530-
format='gif',
531-
file=filename)
573+
format='gif',file=filename)
574+
self.assertEqual(str(image3),'::img::test3')
575+
self.assertEqual(image3.type(),'photo')
576+
self.assertEqual(image3.width(),2)
577+
self.assertEqual(image3.height(),3)
578+
self.assertEqual(image3.get(0,0),image.get(4,6))
579+
self.assertEqual(image3.get(1,2),image.get(5,8))
580+
581+
image.write(filename,background='#ff0000')
582+
image4=tkinter.PhotoImage('::img::test4',master=self.root,
583+
format='ppm',file=filename)
584+
self.assertEqual(image4.get(0,0), (255,0,0))
585+
self.assertEqual(image4.get(4,6),image.get(4,6))
586+
587+
image.write(filename,grayscale=True)
588+
image5=tkinter.PhotoImage('::img::test5',master=self.root,
589+
format='ppm',file=filename)
590+
c=image5.get(4,6)
591+
self.assertTrue(c[0]==c[1]==c[2],c)
592+
593+
deftest_data(self):
594+
image=self.create()
595+
596+
data=image.data()
597+
self.assertIsInstance(data,tuple)
598+
forrowindata:
599+
self.assertIsInstance(row,str)
600+
self.assertEqual(data[6].split()[4],'#%02x%02x%02x'%image.get(4,6))
601+
602+
data=image.data('ppm')
603+
image2=tkinter.PhotoImage('::img::test2',master=self.root,
604+
format='ppm',data=data)
605+
self.assertEqual(str(image2),'::img::test2')
606+
self.assertEqual(image2.type(),'photo')
607+
self.assertEqual(image2.width(),16)
608+
self.assertEqual(image2.height(),16)
609+
self.assertEqual(image2.get(0,0),image.get(0,0))
610+
self.assertEqual(image2.get(4,6),image.get(4,6))
611+
612+
data=image.data(format='gif',from_coords=(4,6,6,9))
613+
image3=tkinter.PhotoImage('::img::test3',master=self.root,
614+
format='gif',data=data)
532615
self.assertEqual(str(image3),'::img::test3')
533616
self.assertEqual(image3.type(),'photo')
534617
self.assertEqual(image3.width(),2)
535618
self.assertEqual(image3.height(),3)
536619
self.assertEqual(image3.get(0,0),image.get(4,6))
537620
self.assertEqual(image3.get(1,2),image.get(5,8))
538621

622+
data=image.data('ppm',background='#ff0000')
623+
image4=tkinter.PhotoImage('::img::test4',master=self.root,
624+
format='ppm',data=data)
625+
self.assertEqual(image4.get(0,0), (255,0,0))
626+
self.assertEqual(image4.get(4,6),image.get(4,6))
627+
628+
data=image.data('ppm',grayscale=True)
629+
image5=tkinter.PhotoImage('::img::test5',master=self.root,
630+
format='ppm',data=data)
631+
c=image5.get(4,6)
632+
self.assertTrue(c[0]==c[1]==c[2],c)
633+
634+
539635
deftest_transparency(self):
540636
image=self.create()
541637
self.assertEqual(image.transparency_get(0,0),True)

‎Lib/tkinter/__init__.py

Lines changed: 111 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -4398,17 +4398,117 @@ def put(self, data, to=None):
43984398
to=to[1:]
43994399
args=args+ ('-to',)+tuple(to)
44004400
self.tk.call(args)
4401-
# XXX read
4402-
4403-
defwrite(self,filename,format=None,from_coords=None):
4404-
"""Write image to file FILENAME in FORMAT starting from
4405-
position FROM_COORDS."""
4406-
args= (self.name,'write',filename)
4407-
ifformat:
4408-
args=args+ ('-format',format)
4409-
iffrom_coords:
4410-
args=args+ ('-from',)+tuple(from_coords)
4411-
self.tk.call(args)
4401+
4402+
defread(self,filename,format=None,*,from_coords=None,to=None,shrink=False):
4403+
"""Reads image data from the file named FILENAME into the image.
4404+
4405+
The FORMAT option specifies the format of the image data in the
4406+
file.
4407+
4408+
The FROM_COORDS option specifies a rectangular sub-region of the image
4409+
file data to be copied to the destination image. It must be a tuple
4410+
or a list of 1 to 4 integers (x1, y1, x2, y2). (x1, y1) and
4411+
(x2, y2) specify diagonally opposite corners of the rectangle. If
4412+
x2 and y2 are not specified, the default value is the bottom-right
4413+
corner of the source image. The default, if this option is not
4414+
specified, is the whole of the image in the image file.
4415+
4416+
The TO option specifies the coordinates of the top-left corner of
4417+
the region of the image into which data from filename are to be
4418+
read. The default is (0, 0).
4419+
4420+
If SHRINK is true, the size of the destination image will be
4421+
reduced, if necessary, so that the region into which the image file
4422+
data are read is at the bottom-right corner of the image.
4423+
"""
4424+
options= ()
4425+
ifformatisnotNone:
4426+
options+= ('-format',format)
4427+
iffrom_coordsisnotNone:
4428+
options+= ('-from',*from_coords)
4429+
ifshrink:
4430+
options+= ('-shrink',)
4431+
iftoisnotNone:
4432+
options+= ('-to',*to)
4433+
self.tk.call(self.name,'read',filename,*options)
4434+
4435+
defwrite(self,filename,format=None,from_coords=None,*,
4436+
background=None,grayscale=False):
4437+
"""Writes image data from the image to a file named FILENAME.
4438+
4439+
The FORMAT option specifies the name of the image file format
4440+
handler to be used to write the data to the file. If this option
4441+
is not given, the format is guessed from the file extension.
4442+
4443+
The FROM_COORDS option specifies a rectangular region of the image
4444+
to be written to the image file. It must be a tuple or a list of 1
4445+
to 4 integers (x1, y1, x2, y2). If only x1 and y1 are specified,
4446+
the region extends from (x1,y1) to the bottom-right corner of the
4447+
image. If all four coordinates are given, they specify diagonally
4448+
opposite corners of the rectangular region. The default, if this
4449+
option is not given, is the whole image.
4450+
4451+
If BACKGROUND is specified, the data will not contain any
4452+
transparency information. In all transparent pixels the color will
4453+
be replaced by the specified color.
4454+
4455+
If GRAYSCALE is true, the data will not contain color information.
4456+
All pixel data will be transformed into grayscale.
4457+
"""
4458+
options= ()
4459+
ifformatisnotNone:
4460+
options+= ('-format',format)
4461+
iffrom_coordsisnotNone:
4462+
options+= ('-from',*from_coords)
4463+
ifgrayscale:
4464+
options+= ('-grayscale',)
4465+
ifbackgroundisnotNone:
4466+
options+= ('-background',background)
4467+
self.tk.call(self.name,'write',filename,*options)
4468+
4469+
defdata(self,format=None,*,from_coords=None,
4470+
background=None,grayscale=False):
4471+
"""Returns image data.
4472+
4473+
The FORMAT option specifies the name of the image file format
4474+
handler to be used. If this option is not given, this method uses
4475+
a format that consists of a tuple (one element per row) of strings
4476+
containings space separated (one element per pixel/column) colors
4477+
in “#RRGGBB” format (where RR is a pair of hexadecimal digits for
4478+
the red channel, GG for green, and BB for blue).
4479+
4480+
The FROM_COORDS option specifies a rectangular region of the image
4481+
to be returned. It must be a tuple or a list of 1 to 4 integers
4482+
(x1, y1, x2, y2). If only x1 and y1 are specified, the region
4483+
extends from (x1,y1) to the bottom-right corner of the image. If
4484+
all four coordinates are given, they specify diagonally opposite
4485+
corners of the rectangular region, including (x1, y1) and excluding
4486+
(x2, y2). The default, if this option is not given, is the whole
4487+
image.
4488+
4489+
If BACKGROUND is specified, the data will not contain any
4490+
transparency information. In all transparent pixels the color will
4491+
be replaced by the specified color.
4492+
4493+
If GRAYSCALE is true, the data will not contain color information.
4494+
All pixel data will be transformed into grayscale.
4495+
"""
4496+
options= ()
4497+
ifformatisnotNone:
4498+
options+= ('-format',format)
4499+
iffrom_coordsisnotNone:
4500+
options+= ('-from',*from_coords)
4501+
ifgrayscale:
4502+
options+= ('-grayscale',)
4503+
ifbackgroundisnotNone:
4504+
options+= ('-background',background)
4505+
data=self.tk.call(self.name,'data',*options)
4506+
ifisinstance(data,str):# For wantobjects = 0.
4507+
ifformatisNone:
4508+
data=self.tk.splitlist(data)
4509+
else:
4510+
data=bytes(data,'latin1')
4511+
returndata
44124512

44134513
deftransparency_get(self,x,y):
44144514
"""Return True if the pixel at x,y is transparent."""
Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,4 @@
1+
Add the:class:`!PhotoImage` methods:meth:`~tkinter.PhotoImage.read` to
2+
read an image from a file and:meth:`~tkinter.PhotoImage.data` to get the
3+
image data. Add *background* and *grayscale* parameters to
4+
:class:`!PhotoImage` method:meth:`~tkinter.PhotoImage.write`.

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