Python image.Image类代码示例

    def test_composite_merge(self):
        # http://stackoverflow.com/questions/3374878

        if not hasattr(Image, 'alpha_composite'):
            raise SkipTest()

        img1 = Image.new('RGBA', size=(100, 100), color=(255, 0, 0, 255))
        draw = ImageDraw.Draw(img1)
        draw.rectangle((33, 0, 66, 100), fill=(255, 0, 0, 128))
        draw.rectangle((67, 0, 100, 100), fill=(255, 0, 0, 0))
        img1 = ImageSource(img1)
        img2 = Image.new('RGBA', size =(100, 100), color=(0, 255, 0, 255))
        draw = ImageDraw.Draw(img2)
        draw.rectangle((0, 33, 100, 66), fill=(0, 255, 0, 128))
        draw.rectangle((0, 67, 100, 100), fill=(0, 255, 0, 0))
        img2 = ImageSource(img2)

        result = merge_images([img2, img1], ImageOptions(merge='composite', transparent=True))
        img = result.as_image()
        eq_(img.mode, 'RGBA')
        eq_(sorted(img.getcolors()), sorted([
            (1089, (0, 255, 0, 255)),
            (1089, (255, 255, 255, 0)),
            (1122, (0, 255, 0, 128)),
            (1122, (128, 126, 0, 255)),
            (1122, (255, 0, 0, 128)),
            (1156, (170, 84, 0, 191)),
            (3300, (255, 0, 0, 255))]))

 def test_solid_merge(self):
     img1 = ImageSource(Image.new('RGB', (10, 10), (255, 0, 255)))
     img2 = ImageSource(Image.new('RGB', (10, 10), (0, 255, 255)))
     
     result = merge_images([img1, img2], ImageOptions(transparent=False))
     img = result.as_image()
     eq_(img.getpixel((0, 0)), (0, 255, 255))

    def test_paletted_merge(self):
        if not hasattr(Image, 'FASTOCTREE'):
            raise SkipTest()

        # generate RGBA images with a transparent rectangle in the lower right
        img1 = ImageSource(Image.new('RGBA', (50, 50), (0, 255, 0, 255))).as_image()
        draw = ImageDraw.Draw(img1)
        draw.rectangle((25, 25, 49, 49), fill=(0, 0, 0, 0))
        paletted_img = quantize(img1, alpha=True)
        assert img_has_transparency(paletted_img)
        assert paletted_img.mode == 'P'

        rgba_img = Image.new('RGBA', (50, 50), (255, 0, 0, 255))
        draw = ImageDraw.Draw(rgba_img)
        draw.rectangle((25, 25, 49, 49), fill=(0, 0, 0, 0))

        img1 = ImageSource(paletted_img)
        img2 = ImageSource(rgba_img)

        # generate base image and merge the others above
        img3 = ImageSource(Image.new('RGBA', (50, 50), (0, 0, 255, 255)))
        result = merge_images([img3, img1, img2], ImageOptions(transparent=True))
        img = result.as_image()

        assert img.mode == 'RGBA'
        eq_(img.getpixel((49, 49)), (0, 0, 255, 255))
        eq_(img.getpixel((0, 0)), (255, 0, 0, 255))

 def test_opacity_merge_mixed_modes(self):
     img1 = ImageSource(Image.new('RGBA', (10, 10), (255, 0, 255, 255)))
     img2 = ImageSource(Image.new('RGB', (10, 10), (0, 255, 255)).convert('P'),
         image_opts=ImageOptions(opacity=0.5))
     
     result = merge_images([img1, img2], ImageOptions(transparent=True))
     img = result.as_image()
     eq_(img.getpixel((0, 0)), (127, 127, 255, 255))

 def test_output_formats_png24(self):
     img = Image.new('RGBA', (100, 100))
     image_opts = PNG_FORMAT.copy()
     image_opts.colors = 0 # TODO image_opts
     ir = ImageSource(img, image_opts=image_opts)
     img = Image.open(ir.as_buffer())
     eq_(img.mode, 'RGBA')
     assert img.getpixel((0, 0)) == (0, 0, 0, 0)

def create_debug_img(size, transparent=True):
    if transparent:
        img = Image.new("RGBA", size)
    else:
        img = Image.new("RGB", size, ImageColor.getrgb("#EEE"))
    
    draw = ImageDraw.Draw(img)
    draw_pattern(draw, size)
    return img

    def test_opacity_merge_mixed_modes(self):
        img1 = ImageSource(Image.new('RGBA', (10, 10), (255, 0, 255, 255)))
        img2 = ImageSource(Image.new('RGB', (10, 10), (0, 255, 255)).convert('P'),
            image_opts=ImageOptions(opacity=0.5))

        result = merge_images([img1, img2], ImageOptions(transparent=True))
        img = result.as_image()
        assert_colors_equal(img, [
            (10*10, (127, 127, 255, 255)),
        ])

def create_image(size, color=None, mode=None):
    if color is not None:
        if isinstance(color, basestring):
            if mode is None:
                mode = 'RGB'
            img = Image.new(mode, size, color=color)
        else:
            if mode is None:
                mode = 'RGBA' if len(color) == 4 else 'RGB'
            img = Image.new(mode, size, color=tuple(color))
    else:
        img = create_debug_img(size)
    return img

 def test_concatenation(self):
     legends = []
     img_1 = Image.new(mode='RGBA', size=(30,10), color="red")
     img_2 = Image.new(mode='RGBA', size=(10,10), color="black")
     img_3 = Image.new(mode='RGBA', size=(50,80), color="blue")
     legends.append(ImageSource(img_1))
     legends.append(ImageSource(img_2))
     legends.append(ImageSource(img_3))
     source = concat_legends(legends)
     src_img = source.as_image()
     assert src_img.getpixel((0,90)) == (255,0,0,255)
     assert src_img.getpixel((0,80)) == (0,0,0,255)
     assert src_img.getpixel((0,0)) == (0,0,255,255)
     assert src_img.getpixel((49,99)) == (255,255,255,0)
     assert is_png(source.as_buffer())

 def test_one_point(self):
     img = Image.new('RGB', (100, 100), color='#ff0000')
     draw = ImageDraw.Draw(img)
     draw.point((99, 99))
     del draw
     
     assert not is_single_color_image(img)

def create_image(size, image_opts=None):
    """
    Create a new image that is compatible with the given `image_opts`.
    Takes into account mode, transparent, bgcolor.
    """
    from mapproxy.platform.image import Image, ImageColor

    if image_opts is None:
        mode = 'RGB'
        bgcolor = (255, 255, 255)
    else:
        mode = image_opts.mode
        if mode in (None, 'P'):
            if image_opts.transparent:
                mode = 'RGBA'
            else:
                mode = 'RGB'

        bgcolor = image_opts.bgcolor or (255, 255, 255)

        if isinstance(bgcolor, basestring):
            bgcolor = ImageColor.getrgb(bgcolor)

        if image_opts.transparent and len(bgcolor) == 3:
            bgcolor = bgcolor + (0, )

        if image_opts.mode == 'I':
            bgcolor = bgcolor[0]

    return Image.new(mode, size, bgcolor)

def assert_image_mode(img, mode):
    pos = img.tell()
    try:
        img = Image.open(img)
        eq_(img.mode, mode)
    finally:
        img.seek(pos)

    def test_mask_partial_image_bgcolor(self):
        img = ImageSource(
            Image.new("RGB", (100, 100), color=(100, 0, 200)), image_opts=ImageOptions(bgcolor=(200, 30, 120))
        )

        result = mask_image_source_from_coverage(img, [0, 0, 10, 10], SRS(4326), coverage([5, 5, 30, 30]))
        eq_(result.as_image().getcolors(), [(7500, (200, 30, 120)), (2500, (100, 0, 200))])

 def test_layers_with_opacity(self):
     # overlay with opacity -> request should not be combined
     common_params = (r'?SERVICE=WMS&FORMAT=image%2Fpng'
                               '&REQUEST=GetMap&HEIGHT=200&SRS=EPSG%3A4326&styles='
                               '&VERSION=1.1.1&BBOX=9.0,50.0,10.0,51.0'
                               '&WIDTH=200')
     
     img_bg = create_tmp_image((200, 200), color=(0, 0, 0))
     img_fg = create_tmp_image((200, 200), color=(255, 0, 128))
     
     expected_req = [
                     ({'path': '/service_a' + common_params + '&layers=a_one'},
                      {'body': img_bg, 'headers': {'content-type': 'image/png'}}),
                     ({'path': '/service_a' + common_params + '&layers=a_two'},
                      {'body': img_fg, 'headers': {'content-type': 'image/png'}}),
                     ]
                      
     with mock_httpd(('localhost', 42423), expected_req):
         self.common_map_req.params.layers = 'opacity_base,opacity_overlay'
         resp = self.app.get(self.common_map_req)
         eq_(resp.content_type, 'image/png')
         data = StringIO(resp.body)
         assert is_png(data)
         img = Image.open(data)
         eq_(img.getcolors()[0], ((200*200),(127, 0, 64)))

 def test_solid_paletted_image(self):
     img = Image.new('P', (100, 100), color=20)
     palette = []
     for i in range(256):
         palette.extend((i, i//2, i%3))
     img.putpalette(palette)
     eq_(is_single_color_image(img), (20, 10, 2))