1 # -*- coding: utf-8 -*-
2 ##############################################################################
4 # OpenERP, Open Source Management Solution
5 # Copyright (C) 2012-today OpenERP s.a. (<http://openerp.com>).
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU Affero General Public License as
9 # published by the Free Software Foundation, either version 3 of the
10 # License, or (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU Affero General Public License for more details.
17 # You should have received a copy of the GNU Affero General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
20 ##############################################################################
23 import cStringIO as StringIO
28 from PIL import ImageEnhance
29 from random import randint
31 # ----------------------------------------
33 # ----------------------------------------
35 def image_resize_image(base64_source, size=(1024, 1024), encoding='base64', filetype=None, avoid_if_small=False):
36 """ Function to resize an image. The image will be resized to the given
37 size, while keeping the aspect ratios, and holes in the image will be
38 filled with transparent background. The image will not be stretched if
39 smaller than the expected size.
40 Steps of the resizing:
41 - Compute width and height if not specified.
42 - if avoid_if_small: if both image sizes are smaller than the requested
43 sizes, the original image is returned. This is used to avoid adding
44 transparent content around images that we do not want to alter but
45 just resize if too big. This is used for example when storing images
46 in the 'image' field: we keep the original image, resized to a maximal
47 size, without adding transparent content around it if smaller.
48 - create a thumbnail of the source image through using the thumbnail
49 function. Aspect ratios are preserved when using it. Note that if the
50 source image is smaller than the expected size, it will not be
51 extended, but filled to match the size.
52 - create a transparent background that will hold the final image.
53 - paste the thumbnail on the transparent background and center it.
55 :param base64_source: base64-encoded version of the source
56 image; if False, returns False
57 :param size: 2-tuple(width, height). A None value for any of width or
58 height mean an automatically computed value based respectivelly
59 on height or width of the source image.
60 :param encoding: the output encoding
61 :param filetype: the output filetype, by default the source image's
62 :type filetype: str, any PIL image format (supported for creation)
63 :param avoid_if_small: do not resize if image height and width
64 are smaller than the expected size.
68 if size == (None, None):
70 image_stream = StringIO.StringIO(base64_source.decode(encoding))
71 image = Image.open(image_stream)
72 # store filetype here, as Image.new below will lose image.format
73 filetype = (filetype or image.format).upper()
77 }.get(filetype, filetype)
79 asked_width, asked_height = size
80 if asked_width is None:
81 asked_width = int(image.size[0] * (float(asked_height) / image.size[1]))
82 if asked_height is None:
83 asked_height = int(image.size[1] * (float(asked_width) / image.size[0]))
84 size = asked_width, asked_height
86 # check image size: do not create a thumbnail if avoiding smaller images
87 if avoid_if_small and image.size[0] <= size[0] and image.size[1] <= size[1]:
90 if image.size != size:
91 image = image_resize_and_sharpen(image, size)
92 if image.mode not in ["1", "L", "P", "RGB", "RGBA"]:
93 image = image.convert("RGB")
95 background_stream = StringIO.StringIO()
96 image.save(background_stream, filetype)
97 return background_stream.getvalue().encode(encoding)
99 def image_resize_and_sharpen(image, size, factor=2.0):
101 Create a thumbnail by resizing while keeping ratio.
102 A sharpen filter is applied for a better looking result.
104 :param image: PIL.Image.Image()
105 :param size: 2-tuple(width, height)
106 :param factor: Sharpen factor (default: 2.0)
108 if image.mode != 'RGBA':
109 image = image.convert('RGBA')
110 image.thumbnail(size, Image.ANTIALIAS)
112 sharpener = ImageEnhance.Sharpness(image)
113 resized_image = sharpener.enhance(factor)
114 # create a transparent image for background and paste the image on it
115 image = Image.new('RGBA', size, (255, 255, 255, 0))
116 image.paste(resized_image, ((size[0] - resized_image.size[0]) / 2, (size[1] - resized_image.size[1]) / 2))
119 def image_save_for_web(image, fp=None, format=None):
121 Save image optimized for web usage.
123 :param image: PIL.Image.Image()
124 :param fp: File name or file object. If not specified, a bytestring is returned.
125 :param format: File format if could not be deduced from image.
127 opt = dict(format=image.format or format)
128 if image.format == 'PNG':
129 opt.update(optimize=True)
130 if image.mode != 'P':
131 # Floyd Steinberg dithering by default
132 image = image.convert('RGBA').convert('P', palette=Image.WEB, colors=256)
133 elif image.format == 'JPEG':
134 opt.update(optimize=True, quality=80)
136 image.save(fp, **opt)
138 img = StringIO.StringIO()
139 image.save(img, **opt)
140 return img.getvalue()
142 def image_resize_image_big(base64_source, size=(1204, 1024), encoding='base64', filetype=None, avoid_if_small=True):
143 """ Wrapper on image_resize_image, to resize images larger than the standard
144 'big' image size: 1024x1024px.
145 :param size, encoding, filetype, avoid_if_small: refer to image_resize_image
147 return image_resize_image(base64_source, size, encoding, filetype, avoid_if_small)
149 def image_resize_image_medium(base64_source, size=(128, 128), encoding='base64', filetype=None, avoid_if_small=False):
150 """ Wrapper on image_resize_image, to resize to the standard 'medium'
152 :param size, encoding, filetype, avoid_if_small: refer to image_resize_image
154 return image_resize_image(base64_source, size, encoding, filetype, avoid_if_small)
156 def image_resize_image_small(base64_source, size=(64, 64), encoding='base64', filetype=None, avoid_if_small=False):
157 """ Wrapper on image_resize_image, to resize to the standard 'small' image
159 :param size, encoding, filetype, avoid_if_small: refer to image_resize_image
161 return image_resize_image(base64_source, size, encoding, filetype, avoid_if_small)
163 # ----------------------------------------
165 # ---------------------------------------
167 def image_colorize(original, randomize=True, color=(255, 255, 255)):
168 """ Add a color to the transparent background of an image.
169 :param original: file object on the original image file
170 :param randomize: randomize the background color
171 :param color: background-color, if not randomize
173 # create a new image, based on the original one
174 original = Image.open(StringIO.StringIO(original))
175 image = Image.new('RGB', original.size)
176 # generate the background color, past it as background
178 color = (randint(32, 224), randint(32, 224), randint(32, 224))
180 image.paste(original, mask=original)
181 # return the new image
182 buffer = StringIO.StringIO()
183 image.save(buffer, 'PNG')
184 return buffer.getvalue()
186 # ----------------------------------------
188 # ---------------------------------------
190 def image_get_resized_images(base64_source, return_big=False, return_medium=True, return_small=True,
191 big_name='image', medium_name='image_medium', small_name='image_small',
192 avoid_resize_big=True, avoid_resize_medium=False, avoid_resize_small=False):
193 """ Standard tool function that returns a dictionary containing the
194 big, medium and small versions of the source image. This function
195 is meant to be used for the methods of functional fields for
198 Default parameters are given to be used for the getter of functional
199 image fields, for example with res.users or res.partner. It returns
200 only image_medium and image_small values, to update those fields.
202 :param base64_source: base64-encoded version of the source
203 image; if False, all returnes values will be False
204 :param return_{..}: if set, computes and return the related resizing
206 :param {..}_name: key of the resized image in the return dictionary;
207 'image', 'image_medium' and 'image_small' by default.
208 :param avoid_resize_[..]: see avoid_if_small parameter
209 :return return_dict: dictionary with resized images, depending on
214 return_dict[big_name] = image_resize_image_big(base64_source, avoid_if_small=avoid_resize_big)
216 return_dict[medium_name] = image_resize_image_medium(base64_source, avoid_if_small=avoid_resize_medium)
218 return_dict[small_name] = image_resize_image_small(base64_source, avoid_if_small=avoid_resize_small)
222 if __name__=="__main__":
225 assert len(sys.argv)==3, 'Usage to Test: image.py SRC.png DEST.png'
227 img = file(sys.argv[1],'rb').read().encode('base64')
228 new = image_resize_image(img, (128,100))
229 file(sys.argv[2], 'wb').write(new.decode('base64'))