How to reduce the image file size using PIL

Question

I am using PIL to resize the images there by converting larger images to smaller ones  Are there any standard ways to reduce the file size of the image without losing the quality too much  lets say the original size of the image is 100KB  i want to get it down to like 5 or 10 KB especially for png and jpeg formats

User · Answer

If you hava a fact png  1MB for 400x400 etc      import    quot importlib quot   import module  quot PIL Image quot   open  quot out png quot   save  quot out png quot

User · Answer

A built-in parameter for saving JPEGs and PNGs is optimize      gt  gt  gt  from PIL import Image    My image is a 200x374 jpeg that is 102kb large   gt  gt  gt  foo   Image open  path  to  image jpg     gt  gt  gt  foo size    200 374     I downsize the image with an ANTIALIAS filter  gives the highest quality    gt  gt  gt  foo   foo resize  160 300  Image ANTIALIAS    gt  gt  gt  foo save  path  to  save  image scaled jpg  quality 95     The saved downsized image size is 24 8kb   gt  gt  gt  foo save  path  to  save  image scaled opt jpg  optimize True quality 95     The saved downsized image size is 22 9kb   The optimize flag will do an extra pass on the image to find a way to reduce its size as much as possible  1 9kb might not seem like much  but over hundreds thousands of pictures  it can add up    Now to try and get it down to 5kb to 10 kb  you can change the quality value in the save options   Using a quality of 85 instead of 95 in this case would yield  Unoptimized  15 1kb Optimized    14 3kb Using a quality of 75  default if argument is left out  would yield  Unoptimized  11 8kb Optimized    11 2kb  I prefer quality 85 with optimize because the quality isn t affected much  and the file size is much smaller

User · Answer

See the thumbnail function of PIL s Image Module  You can use it to save smaller versions of files as various filetypes and if you re wanting to preserve as much quality as you can  consider using the ANTIALIAS filter when you do   Other than that  I m not sure if there s a way to specify a maximum desired size  You could  of course  write a function that might try saving multiple versions of the file at varying qualities until a certain size is met  discarding the rest and giving you the image you wanted

User · Answer

lets say you have a model called Book and on it a field called  cover pic   in that case  you can do the following to compress the image   from PIL import Image b   Book objects get title  Into the wild   image   Image open b cover pic path  image save b image path quality 20 optimize True    hope it helps to anyone stumbling upon it

User · Answer

The main image manager in PIL is PIL s Image module   from PIL import Image import math  foo   Image open  path  to  image jpg   x  y   foo size x2  y2   math floor x-50   math floor y-20  foo   foo resize  x2 y2  Image ANTIALIAS  foo save  path  to  save  image scaled jpg  quality 95    You can add optimize True to the arguments of you want to decrease the size even more  but optimize only works for JPEG s and PNG s  For other image extensions  you could decrease the quality of the new saved image  You could change the size of the new image by just deleting a bit of code and defining the image size and you can only figure out how to do this if you look at the code carefully  I defined this size   x  y   foo size x2  y2   math floor x-50   math floor y-20    just to show you what is  almost  normally done with horizontal images  For vertical images you might do   x  y   foo size x2  y2   math floor x-20   math floor y-50      Remember  you can still delete that bit of code and define a new size

[python] How to reduce the image file size using PIL

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