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comparison photologue/utils/reflection.py @ 71:e2868ad47a1e

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For Django 1.4, using the new manage.py.
author Brian Neal <bgneal@gmail.com>
date Sat, 14 Apr 2012 16:40:29 -0500
parents madeira/photologue/utils/reflection.py@63e4211628e1
children
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70:f26cdda0ad8b 71:e2868ad47a1e
1 """ Function for generating web 2.0 style image reflection effects.
2
3 Copyright (c) 2007, Justin C. Driscoll
4 All rights reserved.
5
6 Redistribution and use in source and binary forms, with or without modification,
7 are permitted provided that the following conditions are met:
8
9 1. Redistributions of source code must retain the above copyright notice,
10 this list of conditions and the following disclaimer.
11
12 2. Redistributions in binary form must reproduce the above copyright
13 notice, this list of conditions and the following disclaimer in the
14 documentation and/or other materials provided with the distribution.
15
16 3. Neither the name of reflection.py nor the names of its contributors may be used
17 to endorse or promote products derived from this software without
18 specific prior written permission.
19
20 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
21 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
22 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
23 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
24 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
27 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31 """
32
33 try:
34 import Image
35 import ImageColor
36 except ImportError:
37 try:
38 from PIL import Image
39 from PIL import ImageColor
40 except ImportError:
41 raise ImportError("The Python Imaging Library was not found.")
42
43
44 def add_reflection(im, bgcolor="#00000", amount=0.4, opacity=0.6):
45 """ Returns the supplied PIL Image (im) with a reflection effect
46
47 bgcolor The background color of the reflection gradient
48 amount The height of the reflection as a percentage of the orignal image
49 opacity The initial opacity of the reflection gradient
50
51 Originally written for the Photologue image management system for Django
52 and Based on the original concept by Bernd Schlapsi
53
54 """
55 # convert bgcolor string to rgb value
56 background_color = ImageColor.getrgb(bgcolor)
57
58 # copy orignial image and flip the orientation
59 reflection = im.copy().transpose(Image.FLIP_TOP_BOTTOM)
60
61 # create a new image filled with the bgcolor the same size
62 background = Image.new("RGB", im.size, background_color)
63
64 # calculate our alpha mask
65 start = int(255 - (255 * opacity)) # The start of our gradient
66 steps = int(255 * amount) # the number of intermedite values
67 increment = (255 - start) / float(steps)
68 mask = Image.new('L', (1, 255))
69 for y in range(255):
70 if y < steps:
71 val = int(y * increment + start)
72 else:
73 val = 255
74 mask.putpixel((0, y), val)
75 alpha_mask = mask.resize(im.size)
76
77 # merge the reflection onto our background color using the alpha mask
78 reflection = Image.composite(background, reflection, alpha_mask)
79
80 # crop the reflection
81 reflection_height = int(im.size[1] * amount)
82 reflection = reflection.crop((0, 0, im.size[0], reflection_height))
83
84 # create new image sized to hold both the original image and the reflection
85 composite = Image.new("RGB", (im.size[0], im.size[1]+reflection_height), background_color)
86
87 # paste the orignal image and the reflection into the composite image
88 composite.paste(im, (0, 0))
89 composite.paste(reflection, (0, im.size[1]))
90
91 # return the image complete with reflection effect
92 return composite
93