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modify image and save with exif data

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  modify image and save with exif data jwe.van.dijk@gmail.com - 2012-12-16 11:43 -0800
    Re: modify image and save with exif data Vincent Vande Vyvre <vincent.vandevyvre@swing.be> - 2012-12-17 07:39 +0100
    Re: modify image and save with exif data jwe.van.dijk@gmail.com - 2012-12-17 01:10 -0800

#34945 — modify image and save with exif data

I want to resize an image but retain the exif data
I now have:
import Image

img = Image.open('photo.jpg')
img.thumbnail((800, 800), Image.ANTIALIAS)
img.save('photo800.jpg', 'JPEG')

The saved image photo800.jpg has no exif info anymore.
I would so much like to have it retained in particular the exposure and gps data.

I use Python 2.7 with PIL 1.17 on Ubuntu 12.04
For exif reading/writing I use pyexiv2 0.3.2 but apparently you cannot add tags to an image that has none; only modifying existing ones seems to work.

Thanks for any helpful suggestions,
Janwillem

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#34957

Le 16/12/12 20:43, jwe.van.dijk@gmail.com a écrit :
> I want to resize an image but retain the exif data
> I now have:
> import Image
>
> img = Image.open('photo.jpg')
> img.thumbnail((800, 800), Image.ANTIALIAS)
> img.save('photo800.jpg', 'JPEG')
>
> The saved image photo800.jpg has no exif info anymore.
> I would so much like to have it retained in particular the exposure and gps data.
>
> I use Python 2.7 with PIL 1.17 on Ubuntu 12.04
> For exif reading/writing I use pyexiv2 0.3.2 but apparently you cannot add tags to an image that has none; only modifying existing ones seems to work.
>
> Thanks for any helpful suggestions,
> Janwillem
Hi,

If a tag is not already set you can create it with pyexiv2.

Example:
----------------------------------------------------------------------
self.data = pyexiv2.ImageMetadata(img.jpg)
self.data.read()

tag = "Exif.Image.ImageWidth"
try:
    self.data[tag].value = sizes[0]
except:
    self.data[tag] = pyexiv2.ExifTag(tag, sizes[0])
-----------------------------------------------------------------------

A more complete example:
http://bazaar.launchpad.net/~vincent-vandevyvre/oqapy/serie-1.0/view/head:/oqapy-1.0/metadata.py



-- 
Vincent V.V.
Oqapy <https://launchpad.net/oqapy> . Qarte
<https://launchpad.net/qarte> . PaQager <https://launchpad.net/paqager>

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#34964

On Sunday, 16 December 2012 20:43:12 UTC+1, jwe.va...@gmail.com  wrote:
> I want to resize an image but retain the exif data
> 
> I now have:
> 
> import Image
> 
> 
> 
> img = Image.open('photo.jpg')
> 
> img.thumbnail((800, 800), Image.ANTIALIAS)
> 
> img.save('photo800.jpg', 'JPEG')
> 
> 
> 
> The saved image photo800.jpg has no exif info anymore.
> 
> I would so much like to have it retained in particular the exposure and gps data.
> 
> 
> 
> I use Python 2.7 with PIL 1.17 on Ubuntu 12.04
> 
> For exif reading/writing I use pyexiv2 0.3.2 but apparently you cannot add tags to an image that has none; only modifying existing ones seems to work.
> 
> 
> 
> Thanks for any helpful suggestions,
> 
> Janwillem

Thanks Vincent,
I tried that but without try-except. I should have done and with also a try except in your except it works. It appears that the failure is in a few Nikon tags that apparently can be read but not set.

Setting Exif.Nikon3.0x002d failed, <class 'pyexiv2.utils.NotifyingList'>
Setting Exif.Nikon3.0x009d failed, <type 'int'>
Setting Exif.Nikon3.ExposureTuning failed, <type 'str'>
Setting Exif.Nikon3.Preview failed, <type 'long'>

Not important so I am happy with your tip.
Janwillem

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