[guardian-dev] sanitizing PNGs

[Rick Valenzuela]

oh, you may already know this, but the previous code keeps a copy of the
file and metadata. if you want it gone with no copies, you have to add a
switch to overwrite, e.g.:

```
with exiftool.ExifTool() as et:
    et.execute(b'-all=', b'-overwrite_original', b'some.png')
```

On 12/12/2017 23:45, Rick Valenzuela wrote:
> heh, nice --  I just found this:
> 
> https://github.com/smarnach/pyexiftool
> 
> Tried it out and it worked great:
> ```
> with exiftool.ExifTool() as et:
>      et.execute(b'-all=', b'some.png')
> ```
> 
> On 12/12/2017 19:53, Hans-Christoph Steiner wrote:
>>
>> Ah, cool, I thought exiftool only worked with JPEGs.  It seems to work
>> with just about every image format.  Now the open question is how to
>> strip all PNG metadata with Python and Java.
>>
>> .hc
>>
>> Rick Valenzuela:
>>> does exiftool do what you need?
>>>
>>> `exiftool -all= <some.PNG>`
>>>
>>> On 11/12/2017 17:57, Hans-Christoph Steiner wrote:
>>>>
>>>> Anyone know any tools for sanitizing PNGs without touching the
>>>> compressed image data?  With JPEG it is easy to strip out EXIF with
>>>> python-pil or many other tools. I haven't found a simple, clean approach
>>>> in Python for PNGs.
>>>>
>>>> .hc
>>>>
>>>
>>
> 

-- 
Rick Valenzuela
Videojournalist
Shanghai, China