本文整理汇总了Python中wand.image.Image.frombytes方法的典型用法代码示例。如果您正苦于以下问题：Python Image.frombytes方法的具体用法？Python Image.frombytes怎么用？Python Image.frombytes使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类wand.image.Image的用法示例。
在下文中一共展示了Image.frombytes方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: pdf_preview
# 需要导入模块: from wand.image import Image [as 别名]
# 或者: from wand.image.Image import frombytes [as 别名]
def pdf_preview(tmp_file_path, tmp_dir):
if use_generic_pdf_cover:
return None
else:
if use_PIL:
try:
input1 = PdfFileReader(open(tmp_file_path, 'rb'), strict=False)
page0 = input1.getPage(0)
xObject = page0['/Resources']['/XObject'].getObject()
for obj in xObject:
if xObject[obj]['/Subtype'] == '/Image':
size = (xObject[obj]['/Width'], xObject[obj]['/Height'])
data = xObject[obj]._data # xObject[obj].getData()
if xObject[obj]['/ColorSpace'] == '/DeviceRGB':
mode = "RGB"
else:
mode = "P"
if '/Filter' in xObject[obj]:
if xObject[obj]['/Filter'] == '/FlateDecode':
img = Image.frombytes(mode, size, data)
cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.png"
img.save(filename=os.path.join(tmp_dir, cover_file_name))
return cover_file_name
# img.save(obj[1:] + ".png")
elif xObject[obj]['/Filter'] == '/DCTDecode':
cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jpg"
img = open(cover_file_name, "wb")
img.write(data)
img.close()
return cover_file_name
elif xObject[obj]['/Filter'] == '/JPXDecode':
cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jp2"
img = open(cover_file_name, "wb")
img.write(data)
img.close()
return cover_file_name
else:
img = Image.frombytes(mode, size, data)
cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.png"
img.save(filename=os.path.join(tmp_dir, cover_file_name))
return cover_file_name
except Exception as ex:
print(ex)
try:
cover_file_name = os.path.splitext(tmp_file_path)[0] + ".cover.jpg"
with Image(filename=tmp_file_path + "[0]", resolution=150) as img:
img.compression_quality = 88
img.save(filename=os.path.join(tmp_dir, cover_file_name))
return cover_file_name
except PolicyError as ex:
logger.warning('Pdf extraction forbidden by Imagemagick policy: %s', ex)
return None
except Exception as ex:
logger.warning('Cannot extract cover image, using default: %s', ex)
return None