# Vision utils
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source
### download_images
``` python
def download_images(
dest, url_file:NoneType=None, urls:NoneType=None, max_pics:int=1000, n_workers:int=8, timeout:int=4,
preserve_filename:bool=False
):
```
*Download images listed in text file `url_file` to path `dest`, at most
`max_pics`*
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source
### resize_to
``` python
def resize_to(
img, targ_sz, use_min:bool=False
):
```
*Size to resize to, to hit `targ_sz` at same aspect ratio, in PIL coords
(i.e w*h)\*
``` python
class _FakeImg():
def __init__(self, size): self.size=size
img = _FakeImg((200,500))
test_eq(resize_to(img, 400), [160,400])
test_eq(resize_to(img, 400, use_min=True), [400,1000])
```
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source
### verify_image
``` python
def verify_image(
fn
):
```
*Confirm that `fn` can be opened*
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source
### verify_images
``` python
def verify_images(
fns
):
```
*Find images in `fns` that can’t be opened*
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### resize_image
``` python
def resize_image(
file, dest, src:str='.', max_size:NoneType=None, n_channels:int=3, ext:NoneType=None, img_format:NoneType=None,
resample:Resampling=, resume:bool=False, kwargs:VAR_KEYWORD
):
```
*Resize file to dest to max_size*
``` python
file = 'puppy.jpg'
dest = Path('.')
resize_image(file, dest, src='images', max_size=400)
im = Image.open(dest/file)
test_eq(im.shape[1],400)
(dest/file).unlink()
```
``` python
file = 'puppy.jpg'
dest = Path('images')
resize_image(file, dest, src=dest, max_size=None)
```
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source
### resize_images
``` python
def resize_images(
path, max_workers:int=4, max_size:NoneType=None, recurse:bool=False, dest:PosixPath=Path('.'), n_channels:int=3,
ext:NoneType=None, img_format:NoneType=None, resample:Resampling=, resume:NoneType=None,
kwargs:VAR_KEYWORD
):
```
*Resize files on path recursively to dest to max_size*
``` python
with tempfile.TemporaryDirectory() as d:
dest = Path(d)/'resized_images'
resize_images('images', max_size=100, dest=dest, max_workers=0, recurse=True)
```