alex/mangle
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Add: manage bogus image (like too short, miss bytes)

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PIL lib is raising a IOError with such pictures, catch it, and if there
is an error, give the original picture instead.
This commit is contained in:
Gabès Jean 2015-09-25 20:43:21 -06:00
parent 3fd0b94134
commit 7dfad73aff
1 changed files with 26 additions and 4 deletions
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26
mangle/image.py
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@ -90,18 +90,34 @@ class KindleData:
} }
# decorate a function that use image, *** and if there
# is an exception raise by PIL (IOError) then return
# the original image because PIL cannot manage it
def protect_bad_image(func):
def func_wrapper(*args, **kwargs):
# If cannot convert (like a bogus image) return the original one
# args will be "image" and other params are after
try:
return func(*args, **kwargs)
except IOError: # Exception from PIL about bad image
return args[0]
return func_wrapper
@protect_bad_image
def splitLeft(image): def splitLeft(image):
widthImg, heightImg = image.size widthImg, heightImg = image.size
return image.crop((0, 0, widthImg / 2, heightImg)) return image.crop((0, 0, widthImg / 2, heightImg))
@protect_bad_image
def splitRight(image): def splitRight(image):
widthImg, heightImg = image.size widthImg, heightImg = image.size
return image.crop((widthImg / 2, 0, widthImg, heightImg)) return image.crop((widthImg / 2, 0, widthImg, heightImg))
@protect_bad_image
def quantizeImage(image, palette): def quantizeImage(image, palette):
colors = len(palette) / 3 colors = len(palette) / 3
if colors < 256: if colors < 256:
@ -113,10 +129,14 @@ def quantizeImage(image, palette):
return image.quantize(palette=palImg) return image.quantize(palette=palImg)
@protect_bad_image
def stretchImage(image, size): def stretchImage(image, size):
widthDev, heightDev = size widthDev, heightDev = size
return image.resize((widthDev, heightDev), Image.ANTIALIAS) return image.resize((widthDev, heightDev), Image.ANTIALIAS)
@protect_bad_image
def resizeImage(image, size): def resizeImage(image, size):
widthDev, heightDev = size widthDev, heightDev = size
widthImg, heightImg = image.size widthImg, heightImg = image.size
@ -140,19 +160,21 @@ def resizeImage(image, size):
return image.resize((widthImg, heightImg), Image.ANTIALIAS) return image.resize((widthImg, heightImg), Image.ANTIALIAS)
@protect_bad_image
def formatImage(image): def formatImage(image):
if image.mode == 'RGB': if image.mode == 'RGB':
return image return image
return image.convert('RGB') return image.convert('RGB')
@protect_bad_image
def orientImage(image, size): def orientImage(image, size):
widthDev, heightDev = size widthDev, heightDev = size
widthImg, heightImg = image.size widthImg, heightImg = image.size
if (widthImg > heightImg) != (widthDev > heightDev): if (widthImg > heightImg) != (widthDev > heightDev):
return image.rotate(90, Image.BICUBIC, True) return image.rotate(90, Image.BICUBIC, True)
return image return image