def captcha_image(request, key, scale=1):
store = get_object_or_404(CaptchaStore, hashkey=key)
text = store.challenge
if settings.CAPTCHA_FONT_PATH.lower().strip().endswith('ttf'):
font = ImageFont.truetype(settings.CAPTCHA_FONT_PATH, settings.CAPTCHA_FONT_SIZE * scale)
else:
font = ImageFont.load(settings.CAPTCHA_FONT_PATH)
size = font.getsize(text)
size = (size[0] * 2, int(size[1] * 1.2))
image = Image.new('RGB', size, settings.CAPTCHA_BACKGROUND_COLOR)
try:
PIL_VERSION = int(NON_DIGITS_RX.sub('', Image.VERSION))
except:
PIL_VERSION = 116
xpos = 2
charlist = []
for char in text:
if char in settings.CAPTCHA_PUNCTUATION and len(charlist) >= 1:
charlist[-1] += char
else:
charlist.append(char)
for char in charlist:
fgimage = Image.new('RGB', size, settings.CAPTCHA_FOREGROUND_COLOR)
charimage = Image.new('L', font.getsize(' %s ' % char), '#000000')
chardraw = ImageDraw.Draw(charimage)
chardraw.text((0, 0), ' %s ' % char, font=font, fill='#ffffff')
if settings.CAPTCHA_LETTER_ROTATION:
if PIL_VERSION >= 116:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), expand=0, resample=Image.BICUBIC)
else:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), resample=Image.BICUBIC)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new('L', size)
maskimage.paste(charimage, (xpos, 4, xpos + charimage.size[0], 4 + charimage.size[1]))
size = maskimage.size
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
image = image.crop((0, 0, xpos + 1, size[1]))
draw = ImageDraw.Draw(image)
for f in settings.noise_functions():
draw = f(draw, image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
image.save(out, "PNG")
out.seek(0)
response = HttpResponse(content_type='image/png')
response.write(out.read())
response['Content-length'] = out.tell()
return response
def captcha_image(request,key):
store = get_object_or_404(CaptchaStore,hashkey=key)
text=store.challenge
tmpimage = Image.new('RGB', (10,10), settings.CAPTCHA_BACKGROUND_COLOR)
if settings.CAPTCHA_FONT_PATH.lower().strip().endswith('ttf'):
font = ImageFont.truetype(settings.CAPTCHA_FONT_PATH,settings.CAPTCHA_FONT_SIZE)
else:
font = ImageFont.load(settings.CAPTCHA_FONT_PATH)
tmpdraw = ImageDraw.Draw(tmpimage)
size = tmpdraw.textsize(text, font=font)
image = tmpimage.resize((size[0]+4,size[1]+4))
del(tmpimage,tmpdraw)
draw = ImageDraw.Draw(image)
draw.text((2, 2), text, font = font, fill = settings.CAPTCHA_FOREGROUND_COLOR)
for f in settings.noise_functions():
draw = f(draw,image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
image.save(out,"PNG")
out.seek(0)
response = HttpResponse()
response['Content-Type'] = 'image/png'
response.write(out.read())
return response
def captcha_image(request, key):
store = get_object_or_404(CaptchaStore, hashkey=key)
text = store.challenge
if settings.CAPTCHA_FONT_PATH.lower().strip().endswith('ttf'):
font = ImageFont.truetype(settings.CAPTCHA_FONT_PATH, settings.CAPTCHA_FONT_SIZE)
else:
font = ImageFont.load(settings.CAPTCHA_FONT_PATH)
size = font.getsize(text)
size = (size[0] * 2, int(size[1] * 1.2))
image = Image.new('RGB', size, settings.CAPTCHA_BACKGROUND_COLOR)
try:
PIL_VERSION = int(NON_DIGITS_RX.sub('', Image.VERSION))
except:
PIL_VERSION = 116
xpos = 2
charlist = []
for char in text:
if char in settings.CAPTCHA_PUNCTUATION and len(charlist) >= 1:
charlist[-1] += char
else:
charlist.append(char)
for char in charlist:
fgimage = Image.new('RGB', size, settings.CAPTCHA_FOREGROUND_COLOR)
charimage = Image.new('L', font.getsize(' %s ' % char), '#000000')
chardraw = ImageDraw.Draw(charimage)
chardraw.text((0, 0), ' %s ' % char, font=font, fill='#ffffff')
if settings.CAPTCHA_LETTER_ROTATION:
if PIL_VERSION >= 116:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), expand=0, resample=Image.BICUBIC)
else:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), resample=Image.BICUBIC)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new('L', size)
maskimage.paste(charimage, (xpos, 4, xpos + charimage.size[0], 4 + charimage.size[1]))
size = maskimage.size
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
image = image.crop((0, 0, xpos + 1, size[1]))
draw = ImageDraw.Draw(image)
for f in settings.noise_functions():
draw = f(draw, image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
image.save(out, "GIF")
out.seek(0)
response = HttpResponse()
response['Content-Type'] = 'image/png'
response.write(out.read())
return response
def captcha_image(request,key):
store = get_object_or_404(CaptchaStore,hashkey=key)
text=store.challenge
if settings.CAPTCHA_FONT_PATH.lower().strip().endswith('ttf'):
font = ImageFont.truetype(settings.CAPTCHA_FONT_PATH,settings.CAPTCHA_FONT_SIZE)
else:
font = ImageFont.load(settings.CAPTCHA_FONT_PATH)
size = font.getsize(text)
size = (size[0]*2,size[1])
image = Image.new('RGB', size , settings.CAPTCHA_BACKGROUND_COLOR)
xpos = 2
for char in text:
fgimage = Image.new('RGB', size, settings.CAPTCHA_FOREGROUND_COLOR)
charimage = Image.new('L', font.getsize(' %s '%char), '#000000')
chardraw = ImageDraw.Draw(charimage)
chardraw.text((0,0), ' %s '%char, font=font, fill='#ffffff')
if hasattr(Image,'VERSION') and int(Image.VERSION.replace('.','')) >= 116:
charimage = charimage.rotate(random.randrange( *settings.CAPTCHA_LETTER_ROTATION ), expand=0, resample=Image.BICUBIC)
else:
charimage = charimage.rotate(random.randrange( *settings.CAPTCHA_LETTER_ROTATION ), resample=Image.BICUBIC)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new('L', size)
maskimage.paste(charimage, (xpos, 4, xpos+charimage.size[0], 4+charimage.size[1] ))
size = maskimage.size
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
image = image.crop((0,0,xpos+1,size[1]))
draw = ImageDraw.Draw(image)
for f in settings.noise_functions():
draw = f(draw,image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
image.save(out,"PNG")
out.seek(0)
response = HttpResponse()
response['Content-Type'] = 'image/png'
response.write(out.read())
return response
def captcha_image(request, key, scale=1):
try:
store = CaptchaStore.objects.get(hashkey=key)
except CaptchaStore.DoesNotExist:
# HTTP 410 Gone status so that crawlers don't index these expired urls.
return HttpResponse(status=410)
text = store.challenge
if isinstance(settings.CAPTCHA_FONT_PATH, six.string_types):
fontpath = settings.CAPTCHA_FONT_PATH
elif isinstance(settings.CAPTCHA_FONT_PATH, (list, tuple)):
fontpath = random.choice(settings.CAPTCHA_FONT_PATH)
else:
raise ImproperlyConfigured('settings.CAPTCHA_FONT_PATH needs to be a path to a font or list of paths to fonts')
if fontpath.lower().strip().endswith('ttf'):
font = ImageFont.truetype(fontpath, settings.CAPTCHA_FONT_SIZE * scale)
else:
font = ImageFont.load(fontpath)
if settings.CAPTCHA_IMAGE_SIZE:
size = settings.CAPTCHA_IMAGE_SIZE
else:
size = getsize(font, text)
size = (size[0] * 2, int(size[1] * 1.4))
image = makeimg(size)
try:
PIL_VERSION = int(NON_DIGITS_RX.sub('', Image.VERSION))
except:
PIL_VERSION = 116
xpos = 2
charlist = []
for char in text:
if char in settings.CAPTCHA_PUNCTUATION and len(charlist) >= 1:
charlist[-1] += char
else:
charlist.append(char)
for char in charlist:
fgimage = Image.new('RGB', size, settings.CAPTCHA_FOREGROUND_COLOR)
charimage = Image.new('L', getsize(font, ' %s ' % char), '#000000')
chardraw = ImageDraw.Draw(charimage)
chardraw.text((0, 0), ' %s ' % char, font=font, fill='#ffffff')
if settings.CAPTCHA_LETTER_ROTATION:
if PIL_VERSION >= 116:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), expand=0, resample=Image.BICUBIC)
else:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), resample=Image.BICUBIC)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new('L', size)
maskimage.paste(charimage, (xpos, from_top, xpos + charimage.size[0], from_top + charimage.size[1]))
size = maskimage.size
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
if settings.CAPTCHA_IMAGE_SIZE:
# centering captcha on the image
tmpimg = makeimg(size)
tmpimg.paste(image, (int((size[0] - xpos) / 2), int((size[1] - charimage.size[1]) / 2 - from_top)))
image = tmpimg.crop((0, 0, size[0], size[1]))
else:
image = image.crop((0, 0, xpos + 1, size[1]))
draw = ImageDraw.Draw(image)
for f in settings.noise_functions():
draw = f(draw, image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
image.save(out, "PNG")
out.seek(0)
response = HttpResponse(content_type='image/png')
response.write(out.read())
response['Content-length'] = out.tell()
return response
def captcha_image(request, key, scale=1):
if scale == 2 and not settings.CAPTCHA_2X_IMAGE:
raise Http404
try:
store = CaptchaStore.objects.get(hashkey=key)
except CaptchaStore.DoesNotExist:
# HTTP 410 Gone status so that crawlers don't index these expired urls.
return HttpResponse(status=410)
random.seed(key) # Do not generate different images for the same key
text = store.challenge
if isinstance(settings.CAPTCHA_FONT_PATH, six.string_types):
fontpath = settings.CAPTCHA_FONT_PATH
elif isinstance(settings.CAPTCHA_FONT_PATH, (list, tuple)):
fontpath = random.choice(settings.CAPTCHA_FONT_PATH)
else:
raise ImproperlyConfigured(
"settings.CAPTCHA_FONT_PATH needs to be a path to a font or list of paths to fonts"
)
if fontpath.lower().strip().endswith("ttf"):
font = ImageFont.truetype(fontpath, settings.CAPTCHA_FONT_SIZE * scale)
else:
font = ImageFont.load(fontpath)
if settings.CAPTCHA_IMAGE_SIZE:
size = settings.CAPTCHA_IMAGE_SIZE
else:
size = getsize(font, text)
size = (size[0] * 2, int(size[1] * 1.4))
image = makeimg(size)
xpos = 2
charlist = []
for char in text:
if char in settings.CAPTCHA_PUNCTUATION and len(charlist) >= 1:
charlist[-1] += char
else:
charlist.append(char)
for char in charlist:
fgimage = Image.new("RGB", size, settings.CAPTCHA_FOREGROUND_COLOR)
charimage = Image.new("L", getsize(font, " %s " % char), "#000000")
chardraw = ImageDraw.Draw(charimage)
chardraw.text((0, 0), " %s " % char, font=font, fill="#ffffff")
if settings.CAPTCHA_LETTER_ROTATION:
charimage = charimage.rotate(
random.randrange(*settings.CAPTCHA_LETTER_ROTATION),
expand=0,
resample=Image.BICUBIC,
)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new("L", size)
maskimage.paste(
charimage,
(
xpos,
DISTANCE_FROM_TOP,
xpos + charimage.size[0],
DISTANCE_FROM_TOP + charimage.size[1],
),
)
size = maskimage.size
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
if settings.CAPTCHA_IMAGE_SIZE:
# centering captcha on the image
tmpimg = makeimg(size)
tmpimg.paste(
image,
(
int((size[0] - xpos) / 2),
int((size[1] - charimage.size[1]) / 2 - DISTANCE_FROM_TOP),
),
)
image = tmpimg.crop((0, 0, size[0], size[1]))
else:
image = image.crop((0, 0, xpos + 1, size[1]))
draw = ImageDraw.Draw(image)
for f in settings.noise_functions():
draw = f(draw, image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
image.save(out, "PNG")
out.seek(0)
response = HttpResponse(content_type="image/png")
response.write(out.read())
response["Content-length"] = out.tell()
return response
def captcha_image(request, key, scale=1):
try:
store = CaptchaStore.objects.get(hashkey=key)
except CaptchaStore.DoesNotExist:
# HTTP 410 Gone status so that crawlers don't index these expired urls.
return HttpResponse(status=410)
text = store.challenge
if isinstance(settings.CAPTCHA_FONT_PATH, six.string_types):
fontpath = settings.CAPTCHA_FONT_PATH
elif isinstance(settings.CAPTCHA_FONT_PATH, (list, tuple)):
fontpath = random.choice(settings.CAPTCHA_FONT_PATH)
else:
raise ImproperlyConfigured(
'settings.CAPTCHA_FONT_PATH needs to be a path to a font or list of paths to fonts'
)
if fontpath.lower().strip().endswith('ttf'):
font = ImageFont.truetype(fontpath, settings.CAPTCHA_FONT_SIZE * scale)
else:
font = ImageFont.load(fontpath)
if settings.CAPTCHA_IMAGE_SIZE:
size = settings.CAPTCHA_IMAGE_SIZE
else:
size = getsize(font, text)
size = (size[0] * 2, int(size[1] * 1.4))
image = makeimg(size)
try:
PIL_VERSION = int(NON_DIGITS_RX.sub('', Image.VERSION))
except:
PIL_VERSION = 116
xpos = 2
charlist = []
for char in text:
if char in settings.CAPTCHA_PUNCTUATION and len(charlist) >= 1:
charlist[-1] += char
else:
charlist.append(char)
for char in charlist:
fgimage = Image.new('RGB', size, settings.CAPTCHA_FOREGROUND_COLOR)
charimage = Image.new('L', getsize(font, ' %s ' % char), '#000000')
chardraw = ImageDraw.Draw(charimage)
chardraw.text((0, 0), ' %s ' % char, font=font, fill='#ffffff')
if settings.CAPTCHA_LETTER_ROTATION:
if PIL_VERSION >= 116:
charimage = charimage.rotate(
random.randrange(*settings.CAPTCHA_LETTER_ROTATION),
expand=0,
resample=Image.BICUBIC)
else:
charimage = charimage.rotate(
random.randrange(*settings.CAPTCHA_LETTER_ROTATION),
resample=Image.BICUBIC)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new('L', size)
maskimage.paste(charimage, (xpos, from_top, xpos + charimage.size[0],
from_top + charimage.size[1]))
size = maskimage.size
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
if settings.CAPTCHA_IMAGE_SIZE:
# centering captcha on the image
tmpimg = makeimg(size)
tmpimg.paste(image,
(int((size[0] - xpos) / 2),
int((size[1] - charimage.size[1]) / 2 - from_top)))
image = tmpimg.crop((0, 0, size[0], size[1]))
else:
image = image.crop((0, 0, xpos + 1, size[1]))
draw = ImageDraw.Draw(image)
for f in settings.noise_functions():
draw = f(draw, image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
image.save(out, "PNG")
out.seek(0)
response = HttpResponse(content_type='image/png')
response.write(out.read())
response['Content-length'] = out.tell()
return response
def captcha_image(request, key):
store = get_object_or_404(CaptchaStore, hashkey=key)
text = store.challenge
#获取字体对应的文件
if settings.CAPTCHA_FONT_PATH.lower().strip().endswith('ttf'):
font = ImageFont.truetype(settings.CAPTCHA_FONT_PATH, settings.CAPTCHA_FONT_SIZE)
else:
font = ImageFont.load(settings.CAPTCHA_FONT_PATH)
#获取最终要生成的图片的基础模板，其中其大小合适，注意若是CAPTCHA_FONT_SIZE过大，则会发生错误。。。。注意。。。。，而且此时不包含文本数据
size = font.getsize(text)
size = (size[0] * 2, int(size[1] * 1.2))
image = Image.new('RGB', size, settings.CAPTCHA_BACKGROUND_COLOR)
#sub( pattern, repl, string[, count])
# repl可以时候字符串，也可以式函数
# 当repl是字符串的时候，
# 就是把string 内符合pattern的子串，用repl替换了
#
# 当repl是函数的时候，对每一个在string内的，不重叠的，匹配pattern
# 的子串，调用repl（substring），然后用返回值替换substring
try:
PIL_VERSION = int(NON_DIGITS_RX.sub('', Image.VERSION))
except:
PIL_VERSION = 116
#增加x轴字母之间的字符间距
xpos = 2
#punctution :标点
charlist = []
for char in text:
if char in settings.CAPTCHA_PUNCTUATION and len(charlist) >= 1:
charlist[-1] += char
else:
charlist.append(char)
for char in charlist:
fgimage = Image.new('RGB', size, settings.CAPTCHA_FOREGROUND_COLOR)
charimage = Image.new('L', font.getsize(' %s ' % char), '#000000')
chardraw = ImageDraw.Draw(charimage)
chardraw.text((0, 0), ' %s ' % char, font=font, fill='#ffffff')
if settings.CAPTCHA_LETTER_ROTATION:
if PIL_VERSION >= 116:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), expand=0, resample=Image.BICUBIC)
else:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), resample=Image.BICUBIC)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new('L', size)
maskimage.paste(charimage, (xpos, 4, xpos + charimage.size[0], 4 + charimage.size[1]))
size = maskimage.size
#使用蒙板，将图像绘制到指定的图像中去
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
image = image.crop((0, 0, xpos + 1, size[1]))
draw = ImageDraw.Draw(image)
#为了防止识别，则调用加入杂音函数，实现了在图像上加点和加弧线及直线的干扰
for f in settings.noise_functions():
draw = f(draw, image)
#在原来基础上加了滤镜效果
for f in settings.filter_functions():
image = f(image)
#使用stringio则操作全部在内存中，减少了高耗资源的文件读写操作
out = StringIO()
image.save(out, "PNG")
out.seek(0)
response = HttpResponse()
response['Content-Type'] = 'image/png'
response.write(out.read())
return response
random.randrange(*settings.CAPTCHA_LETTER_ROTATION),
resample=Image.BICUBIC)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new('L', size)
maskimage.paste(
charimage,
(xpos, 4, xpos + charimage.size[0], 4 + charimage.size[1]))
size = maskimage.size
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
image = image.crop((0, 0, xpos + 1, size[1]))
draw = ImageDraw.Draw(image)
for f in settings.noise_functions():
draw = f(draw, image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
#如果使用PNG的话会不显示验证码
image.save(out, "GIF")
out.seek(0)
response = HttpResponse()
response['Content-Type'] = 'image/gif'
response.write(out.read())
return response
def captcha_image(request, key, scale=1, **kwargs):
try:
store = CaptchaStore.objects.get(hashkey=key)
except CaptchaStore.DoesNotExist:
# HTTP 410 Gone status so that crawlers don't index these expired urls.
return HttpResponse(status=410)
text = store.challenge
if settings.CAPTCHA_FONT_PATH.lower().strip().endswith('ttf'):
font = ImageFont.truetype(settings.CAPTCHA_FONT_PATH,
settings.CAPTCHA_FONT_SIZE * scale)
else:
font = ImageFont.load(settings.CAPTCHA_FONT_PATH)
size = getsize(font, text)
size = (size[0] * 2, int(size[1] * 1.4))
if settings.CAPTCHA_BACKGROUND_COLOR == "transparent":
image = Image.new('RGBA', size)
else:
image = Image.new('RGB', size, settings.CAPTCHA_BACKGROUND_COLOR)
try:
PIL_VERSION = int(NON_DIGITS_RX.sub('', Image.VERSION))
except:
PIL_VERSION = 116
xpos = 2
charlist = []
for char in text:
if char in settings.CAPTCHA_PUNCTUATION and len(charlist) >= 1:
charlist[-1] += char
else:
charlist.append(char)
for char in charlist:
fgimage = Image.new('RGB', size, settings.CAPTCHA_FOREGROUND_COLOR)
charimage = Image.new('L', getsize(font, ' %s ' % char), '#000000')
chardraw = ImageDraw.Draw(charimage)
chardraw.text((0, 0), ' %s ' % char, font=font, fill='#ffffff')
if settings.CAPTCHA_LETTER_ROTATION:
if PIL_VERSION >= 116:
charimage = charimage.rotate(
random.randrange(*settings.CAPTCHA_LETTER_ROTATION),
expand=0,
resample=Image.BICUBIC)
else:
charimage = charimage.rotate(
random.randrange(*settings.CAPTCHA_LETTER_ROTATION),
resample=Image.BICUBIC)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new('L', size)
maskimage.paste(charimage, (xpos, from_top, xpos + charimage.size[0],
from_top + charimage.size[1]))
size = maskimage.size
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
image = image.crop((0, 0, xpos + 1, size[1]))
draw = ImageDraw.Draw(image)
for f in settings.noise_functions():
draw = f(draw, image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
image.save(out, "PNG")
out.seek(0)
response = HttpResponse(content_type='image/png')
response.write(out.read())
response['Content-length'] = out.tell()
return response
if PIL_VERSION >= 116:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), expand=0, resample=Image.BICUBIC)
else:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), resample=Image.BICUBIC)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new('L', size)
maskimage.paste(charimage, (xpos, 4, xpos + charimage.size[0], 4 + charimage.size[1]))
size = maskimage.size
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
image = image.crop((0, 0, xpos + 1, size[1]))
draw = ImageDraw.Draw(image)
for f in settings.noise_functions():
draw = f(draw, image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
#如果使用PNG的话会不显示验证码
image.save(out, "GIF")
out.seek(0)
response = HttpResponse()
response['Content-Type'] = 'image/gif'
response.write(out.read())
return response
