8000 add examples from previous version · libvips/pyvips@6b688f2 · GitHub
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jcupittjcupitt
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add examples from previous version
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‎README.rst

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import pyvips
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Vips = pyvips
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Instead of the `pyvips = Vips`, you can also swap all `Vips` for `pyvips` with
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eg.:
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%s/Vips/pyvips/g
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Background
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----------
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‎examples/cod.py

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#!/usr/bin/python
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import sys
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import logging
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#logging.basicConfig(level = logging.DEBUG)
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import pyvips
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#pyvips.cache_set_trace(True)
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def to_polar(image):
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"""Transform image coordinates to polar.
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The image is transformed so that it is wrapped around a point in the
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centre. Vertical straight lines become circles or segments of circles,
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horizontal straight lines become radial spokes.
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"""
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# xy image, origin in the centre, scaled to fit image to a circle
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xy = pyvips.Image.xyz(image.width, image.height)
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xy -= [image.width / 2.0, image.height / 2.0]
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scale = min(image.width, image.height) / float(image.width)
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xy *= 2.0 / scale
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index = xy.polar()
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# scale vertical axis to 360 degrees
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index *= [1, image.height / 360.0]
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return image.mapim(index)
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def to_rectangular(image):
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"""Transform image coordinates to rectangular.
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The image is transformed so that it is unwrapped from a point in the
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centre. Circles or segments of circles become vertical straight lines,
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radial lines become horizontal lines.
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"""
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# xy image, vertical scaled to 360 degrees
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xy = pyvips.Image.xyz(image.width, image.height)
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xy *= [1, 360.0 / image.height]
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index = xy.rect()
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# scale to image rect
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scale = min(image.width, image.height) / float(image.width)
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index *= scale / 2.0
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index += [image.width / 2.0, image.height / 2.0]
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return image.mapim(index)
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a = pyvips.Image.new_from_file(sys.argv[1])
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a = to_polar(a)
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a = to_rectangular(a)
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a.write_to_file(sys.argv[2])
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‎examples/read_profile.py

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#!/usr/bin/python
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import sys
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#import logging
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#logging.basicConfig(level = logging.DEBUG)
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import pyvips
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#pyvips.cache_set_trace(True)
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a = pyvips.Image.new_from_file(sys.argv[1])
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profile = a.get_value("icc-profile-data")
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with open('x.icm', 'w') as f:
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f.write(profile)
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‎examples/try10.py

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#!/usr/bin/python
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import sys
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import logging
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#logging.basicConfig(level = logging.DEBUG)
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import pyvips
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a = pyvips.Image.black(100, 100)
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a = a.draw_circle(128, 50, 50, 20)
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b = a.hough_circle(scale = 1, min_radius = 15, max_radius = 25)
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b.write_to_file("x.v")

‎examples/try11.py

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#!/usr/bin/python
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import sys
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#import logging
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#logging.basicConfig(level = logging.DEBUG)
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import pyvips
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a = pyvips.Image.new_from_file(sys.argv[1])
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ipct = a.get("ipct-data")
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print "ipct = ", ipct.get()
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a.remove("ipct-data")
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a.write_to_file("x.jpg")

‎examples/try12.py

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#!/usr/bin/python
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import sys
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import pyvips
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im = pyvips.Image.new_from_file(sys.argv[1], access = pyvips.Access.SEQUENTIAL)
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footer = pyvips.Image.black(im.width, 150)
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left_text = pyvips.Image.text("left corner", dpi = 300)
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right_text = pyvips.Image.text("right corner", dpi = 300)
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footer = footer.insert(left_text, 50, 50)
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footer = footer.insert(right_text, im.width - right_text.width - 50, 50)
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footer = footer.ifthenelse(0, [255, 0, 0], blend = True)
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im = im.insert(footer, 0, im.height, expand = True)
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im.write_to_file(sys.argv[2])

‎examples/try13.py

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#!/usr/bin/python
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import sys
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import logging
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logging.basicConfig(level = logging.DEBUG)
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import pyvips

‎examples/try14.py

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#!/usr/bin/python
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import sys
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import logging
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#logging.basicConfig(level = logging.DEBUG)
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import pyvips
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a = pyvips.Image.black(100, 100)
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b = a.bandjoin(2)
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b.write_to_file("x.v")
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txt = pyvips.Image.text("left corner", dpi = 300)
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c = txt.ifthenelse(2, [0, 255, 0], blend = True)
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c.write_to_file("x2.v")

‎examples/try16.py

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#!/usr/bin/python3
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import sys
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import logging
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logging.basicConfig(level = logging.DEBUG)
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import pyvips
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# pyvips.cache_set_trace(True)
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a = pyvips.Image.new_from_file(sys.argv[1])
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x = a.erode([[128, 255, 128],
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[255, 255, 255],
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[128, 255, 128]])
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x.write_to_file(sys.argv[2])
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‎examples/try17.py

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#!/usr/bin/python3
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import sys
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import logging
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#logging.basicConfig(level = logging.DEBUG)
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import pyvips
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# pyvips.cache_set_trace(True)
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a = pyvips.Image.new_from_file(sys.argv[1])
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a = a[1:]
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a.write_to_file(sys.argv[2])
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‎examples/try2.py

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#!/usr/bin/python
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import logging
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logging.basicConfig(level = logging.DEBUG)
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import pyvips
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pyvips.cache_set_trace(True)
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try:
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a = pyvips.Image.new_from_file("/home/john/pics/babe.poop")
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except pyvips.Error, e:
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print e
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a = pyvips.Image.new_from_file("/home/john/pics/babe.jpg")
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b = pyvips.Image.new_from_file("/home/john/pics/k2.jpg")
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print 'a =', a
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print 'b =', b
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out = pyvips.call("add", a, b)
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print 'out =', out
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out = a.add(b)
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print 'out =', out
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out = out.linear([1, 1, 1], [2, 2, 2])
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out.write_to_file("x.v")

‎examples/try3.py

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#!/usr/bin/python
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import sys
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#import logging
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#logging.basicConfig(level = logging.DEBUG)
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import pyvips
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pyvips.cache_set_trace(True)
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a = pyvips.Image.new_from_file(sys.argv[1])
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print a.max()
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print a.max()
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‎examples/try4.py

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#!/usr/bin/python
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import sys
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#import logging
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#logging.basicConfig(level = logging.DEBUG)
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import pyvips
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a = pyvips.Image.new_from_file(sys.argv[1])
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b = pyvips.Image.new_from_file(sys.argv[2])
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c = a.join(b, pyvips.Direction.HORIZONTAL,
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expand = True,
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shim = 100,
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align = pyvips.Align.CENTRE,
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background = [128, 255, 128])
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c.write_to_file(sys.argv[3])

‎examples/try5.py

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#!/usr/bin/python
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import sys
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#import logging
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#logging.basicConfig(level = logging.DEBUG)
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import pyvips
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a = pyvips.Image.new_from_file(sys.argv[1])
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def should_equal(test, a, b):
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if abs(a - b) > 0.01:
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print '%s: seen %g and %g' % (test, a, b)
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sys.exit(1)
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def bandsplit(a):
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return [a.extract_band(i) for i in range(0, a.bands)]
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# test operator overloads
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# addition
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b = a + 12
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should_equal('add constant', a.avg() + 12, b.avg())
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b = a + [12, 0, 0]
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x = map (lambda x: x.avg()) bandsplit(a)
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y = map (lambda x: x.avg()) bandsplit(b)
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x[0] += 12
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should_equal('add multiband constant', sum(x), sum(y))
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b = a + [12, 0, 0]
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b = a + b
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b = 12 + a
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b = [12, 0, 0] + a
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b = a - 12
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b = a - [12, 0, 0]
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b = a - b
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b = 12 - a
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b = [12, 0, 0] - a
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b = a * 12
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b = a * [12, 1, 1]
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b = a * b
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b = 12 * a
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b = [12, 1, 1] * a
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b = a / 12
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b = a / [12, 1, 1]
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b = 12 / a
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b = [12, 1, 1] / a
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b = a / b
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b = a // 12
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b = a // [12, 1, 1]
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b = 12 // a
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b = [12, 1, 1] // a
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b = a // b
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b = a % 12
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b = a % [12, 1, 1]
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b = a % b
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b = a ** 12
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b = a ** [12, 1, 1]
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b = 12 ** a
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b = [12, 1, 1] ** a
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b = a ** b
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b = a << 12
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b = a << [12, 1, 1]
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b = a << b
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b = a >> 12
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b = a >> [12, 1, 1]
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b = a >> b
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b = a & 12
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b = a & [12, 1, 1]
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b = 12 & a
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b = [12, 1, 1] & a
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b = a & b
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b = a | 12
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b = a | [12, 1, 1]
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b = 12 | a
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b = [12, 1, 1] | a
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b = a | b
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b = a ^ 12
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b = a ^ [12, 1, 1]
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b = 12 ^ a
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b = [12, 1, 1] ^ a
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b = a ^ b
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b = -a
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b = +a
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b = abs(a)
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b = ~a
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