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NationalGalleryOfArt / opendata

The National Gallery of Art Open Data Program
https://www.nga.gov/open-access-images/open-data.html
Creative Commons Zero v1.0 Universal
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Image download #16

Open conceptofmind opened 1 month ago

conceptofmind commented 1 month ago

Hi @beaudet ,

Thank you for all of your work.

I would like to confirm that we should be downloading the images from the imageurl column in the mediaitems.csv file.

And, is there a specific amount of time that we should wait between requests?

Thank you,

Enrico

beaudet commented 1 month ago

Thanks for your interest!

The images listed in the the media items are typically thumbnails or larger representative images of audio and video files. If you're looking for images of art, I'd recommend using the IIIF endpoint with images listed in the published images table tied to the objects table via the "depictstmsobjectid".

The open data has had a lapse in updates while we transition some systems, so some of the images, particularly the ones in the media items, might result in 404s currently.

Please just follow any crawling rules defined in the robots.txt files on the endpoints serving assets.

conceptofmind commented 1 month ago

Thanks for your interest!

The images listed in the the media items are typically thumbnails or larger representative images of audio and video files. If you're looking for images of art, I'd recommend using the IIIF endpoint with images listed in the published images table tied to the objects table via the "depictstmsobjectid".

The open data has had a lapse in updates while we transition some systems, so some of the images, particularly the ones in the media items, might result in 404s currently.

Please just follow any crawling rules defined in the robots.txt files on the endpoints serving assets.

Hi @beaudet ,

I appreciate the input.

I will use the IIIF endpoint to collect all of the images of art with depictstmsobjectid.

Is there an identifier to determine that each of the images is under CC0 and the open data program?

Thank you,

Enrico

beaudet commented 1 month ago

Great question. While the data itself is CCO and a large number of our collection images are as well, there are links in the published images data set to images with copyright restrictions. You'll find that only a small "fair use" version of images with restrictions is available. This is indicated by the "maxpixels" column in the published images table. Any image with a zero (0) listed for the maxpixels restriction means that image has no restrictions and falls under our open access image policy: https://www.nga.gov/open-access-images.html