New photos module read metadata

[AlainG]

Photos read metadata

I am looking at the new photos module. Is it possible to read metadata like description and tags from photos? That would be really cool as it is missing from iOS.

[AlainG]

Thanks for the quick reply and code ! Awesome! I will look at it a See you on the bitstream ! Alain further.

[Phuket2]

@AlainG , keep an eye on your post here. Someone might have a way to help you that I dont know about.

[zrzka]

If you need more properties, like more detailed metada, just check the code at the end of this response. It's for Pythonista 3.1.1 (311014, beta). Output of this code is:

Asset properties
 {
    ColorModel = RGB;
    Depth = 8;
    Orientation = 1;
    PixelHeight = 2048;
    PixelWidth = 2732;
    ProfileName = "Display P3";
    "{Exif}" =     {
        DateTimeOriginal = "2017:08:24 16:48:37";
        PixelXDimension = 2732;
        PixelYDimension = 2048;
        UserComment = Screenshot;
    };
    "{JFIF}" =     {
        DensityUnit = 0;
        JFIFVersion =         (
            1,
            0,
            1
        );
        XDensity = 72;
        YDensity = 72;
    };
    "{TIFF}" =     {
        Orientation = 1;
    };
}

#!python3

from objc_util import ObjCClass, ObjCBlock, ObjCInstance, retain_global
from ctypes import c_void_p
import photos

PHContentEditingInputRequestOptions = ObjCClass('PHContentEditingInputRequestOptions')
CIImage = ObjCClass('CIImage')


def get_last_screenshot():
    album = photos.get_screenshots_album()
    assets = album.assets
    if assets:
        return assets[0]  # PHAsset - https://developer.apple.com/documentation/photos/phasset?language=objc
    return None


def get_asset_properties(asset, handler):
    def _block(_cmd, editing_input, info):
        url = ObjCInstance(editing_input).fullSizeImageURL()
        if not url:
            handler(asset, None)
            return

        image = CIImage.imageWithContentsOfURL_(url)
        if image:
            handler(asset, image.properties())
        else:
            handler(asset, None)

    options = PHContentEditingInputRequestOptions.alloc().init()
    options.setNetworkAccessAllowed_(True)
    
    block = ObjCBlock(_block, argtypes=[c_void_p, c_void_p, c_void_p])
    retain_global(block)
    ObjCInstance(asset).requestContentEditingInputWithOptions_completionHandler_(options, block)


def main():
    screenshot = get_last_screenshot()
    if not screenshot:
        print('No screenshot')
        return

    def handler(asset, properties):
        print('Asset properties\n', properties)

    get_asset_properties(screenshot, handler)
    
    
if __name__ == '__main__':
    main()

[omz]

@zrzka I suspect that you could make this code significantly simpler by using photos.Asset.get_image_data().

I also suspect that getting the keywords/tags from the Mac Photos app may not actually be possible.

[zrzka]

@omz yup, here it is, ..., but not sure if it always contains original with all these EXIF datas, ... Long time I did use Photos.framework, AssetsLibrary.framework, ... Apple is constantly changing it.

#!python3

import photos
from objc_util import ObjCClass

CIImage = ObjCClass('CIImage')


def get_last_screenshot():
    album = photos.get_screenshots_album()
    assets = album.assets
    if assets:
        return assets[0]  # PHAsset - https://developer.apple.com/documentation/photos/phasset?language=objc
    return None


def get_asset_properties(asset):
    data = asset.get_image_data().read()
    image = CIImage.imageWithData_(data)
    return image.properties()


def main():
    screenshot = get_last_screenshot()
    if not screenshot:
        print('No screenshot')
        return

    properties = get_asset_properties(screenshot)
    print(properties)
    
    
if __name__ == '__main__':
    main()

[cvp]

I use piexif module from Github and I can read all exifs from a photo, even ones from Apple.

[omz]

@cvp Neat! Might make sense to bundle that with Pythonista.

[zrzka]

Just tried CIImage image properties on a photo with keywords, location, faces, ... and here's the output. Unable to find keywords only, everything else is there. Maybe worth adding as Asset.properties property?

[alexhamberg]

Hello, maybe you can try WidsMob Mac Photo Viewer to browse all pictures in EXIF mode. Thus, you can get all photo metadata by one click.