python - Using PIL to create thumbnails results in TextEdit Document extension -

using pil, able create thumbnail of picture according computer (running mac os x), image has extension of textedit document instead of png or jpeg. wondering how can fix result in correct extension.

here code ran:

>>> pil import image >>> import glob, os >>> size = 128, 128 >>> pic = glob.glob("cherngloong1.jpg") >>> im = image.open(pic[0]) >>> im <pil.jpegimageplugin.jpegimagefile image mode=rgb size=2048x1365 @ 0x100a63bd8> >>> im.thumbnail(size, image.antialias) >>> im.save("cherngloong_thumbnail", "png") >>> im.save("cherngloong_thumbnail1", "jpeg") 

thumbnail extensions:

this happening because aren't saving filename extension.

most modern operating systems use file extensions determine program should open file.

since called:

>>> im.save("cherngloong_thumbnail", "png") >>> im.save("cherngloong_thumbnail1", "jpeg") 

the encoding png/jpg, extension not.

also, why opened textedit, had readme (or other text document) didn't have extension. when opened it, did textedit , files without extension, os x opens files textedit.

to solve problem save this:

im.save("cherngloong_thumbnail.png", "png") im.save("cherngloong_thumbnail1.jpg", "jpeg") 

note compatibility, should save lowercase letters, *nix oses deal upper , lower case extensions differently. , treated other image file on computer. read more file extensions on the wikipedia page