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[英]Python PIL (Pillow) resizes my pictures after modifying exif data
[英]how maintain exif data of images resizes using PIL
當我嘗試使用PIL調整圖像大小(縮略圖)時,它會破壞與圖像關聯的exif數據,如何保存它。
我調整圖像大小並將其作為圖像緩沖區上傳到雲端。
file_path = '...'
file_name = '...'
im = Image.open( file_path )
size =(512,521)
im.thumbnail( size, Image.ANTIALIAS)
thumbnail_buf_string = StringIO.StringIO()
file_save_extension = 'JPEG'
im.save(thumbnail_buf_string, format=file_save_extension)
upload_to_cloud('512_' + file_name , thumbnail_buf_string.getvalue())
已調整大小的圖像沒有exif數據。
注意:我自己還沒有這樣做,但據我所知,PIL只允許讀取exif標簽但不能編寫它們。 您可能需要使用gexiv2或pyexiv2將標記寫入縮略圖。
更新:我好奇並親自嘗試過:D如果我找到了你,你只想復制元數據而無需進一步修改。
這仍然很粗糙,但似乎有效:
import os
import Image
import pyexiv2
fp = '/home/klaus/workspace'
fn = 'img_2380.jpg'
full_path = os.path.join(fp, fn)
print full_path
im = Image.open(full_path)
size = 512, 512
im.thumbnail(size, Image.ANTIALIAS)
im.save('bla.jpg', 'JPEG')
oldmeta = pyexiv2.ImageMetadata(full_path)
oldmeta.read()
# read metadata of the original file
newmeta = pyexiv2.ImageMetadata('bla.jpg')
newmeta.read()
# read metadata of the new file
# yes, there aren't any, but this is crucial!
# you need this class as the target for copying!
oldmeta.copy(newmeta)
newmeta.write()
# don't forget to write the data to the new file
順便說一句:感謝有趣的問題!
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