Loop through every photo in Photos - macos

Question

I want to clean up my Photos library and especially move all my iPhone screenshots to a new album, that way I can easily look through them and delete what I want.
Now for this I first wanted to make a smart album in Photos, but it seems that Photos can't filter on the dimensions of an image, so I started up the AppleScript Editor :).
I created the following script, which works on a "Test Album" I created:
tell application "Photos"
set source_album_name to "Test Album"
set target_album_name to "Screenshots"
set target_width to 640
set target_height to 1136
if not (exists container named target_album_name) then
make new album named target_album_name
end if
set target_album to container target_album_name
set source_album to container source_album_name
set imageList to {}
repeat with photo in media items in source_album
if width of photo = target_width and height of photo = target_height then
set the end of imageList to photo
end if
end repeat
add imageList to target_album
end tell
This script loops through an Album named Test Album and compares the height and width to the dimensions of an iPhone 5S. When they match, it adds the photo to the Screenshots library. No problems there.
Now I want to run this script on my entire photo collection, so I changed the line repeat with photo in media items in source_album to repeat with photo in every media item.
This generates an error once it is past the first item (Photos got an error: Can’t get item 2 of every media item. Invalid index).
After that I changed the code to:
set all_images to every media item
repeat with photo in all_images
but after loading for a while, the script exits with code -10000, probably because of the amount of photos in that library (27.000).
Is there some way to page through a set like this?
EDIT: Changing the set line to contain a better query has the same effect, resulting in an AppleEvent handler failed with error number -10000.
set all_images to every media item whose width = target_width and height = target_height

Answer 1

The -10000 error is due to a bug in Photos 1.0. I've filed this with Apple as radar 20626449 (on OpenRadar at http://openradar.appspot.com/radar?id=6090497735000064). The error is intermittent, but the more photos there are in the library, the more likely it is to occur on any given scripting command.
There is no totally reliable way around the error, but one thing that seems to help is if the "All Photos" album is selected in Photos before starting your script. Unfortunately the Photos AppleScript suite doesn't have the ability to select an album, so you'll need to do this manually before starting the script.

Answer 2

Not sure if you mind dropping into the shell in Terminal, or if you can make that work with iPhoto, but if that is ok, this may get you started on finding all files in your HOME directory and below, that are PNGs and that match your sizes...
#!/bin/bash
isIphone() {
# Get width using sips, don't bother getting height if not 640 wide
w=$(sips -g pixelWidth "$1" | awk 'END{print $2}')
[ "$w" != "640" ] && return
# Get height using sips, just return if not iPhone size
h=$(sips -g pixelHeight "$1" | awk 'END{print $2}')
[ $h != "1136" ] && return
# Output image size and name
echo $w,$h, $1
}
# Go through all PNG files in HOME directory listing iPhone-sized ones
find ~ -iname "*.png" -type f -print0 | while read -d $'\0' -r file ; do isIphone "$file"; done
Output
640,1136, ./iPhone/2013 09 iPhone/IMG_0269.PNG
640,1136, ./iPhone/2013 09 iPhone/IMG_0363.PNG
640,1136, ./iPhone/2013 09 iPhone/IMG_0376.PNG