Thumbnails require more than simply generating a small square section from an image. Ideally it is in some way representative of the image. The thumbnail command will choose a “good” region of the image to display as a thumbnail.
$ ml thumbnail azcv img.jpg img-thumbnail.jpg
Generating a thumbnail from a photo may sound like a pretty simple task. However, what should go into the thumbnail to give the most informative indication of the content of the full photo. This is the task addressed by the thumbnail service as part of the computer vision cognitive service.
As a command line tool an input image file is supplied and a thumbnail image file is created with the same name but with -thumbnail appended to the file name and saved locally.
$ ml thumbnail azcv https://images.pexels.com/photos/338515/pexels-photo-338515.jpeg pexels-photo-338515-thumbnail.jpeg
$ ml thumbnail azcv http://cdn1.thr.com/sites/default/files/2013/11/marina_bay_sands_singapore_a_l.jpg marina_bay_sands_singapore_a_l-thumbnail.jpg
$ ml thumbnail azcv https://access.togaware.com/landmark01.jpg landmark02-thumbnail.jpg
$ ml thumbnail azcv https://www.wayoutback.com.au/assets/Uploads/Uluru.jpg Uluru-thumbnail.jpg
Notice how the whole of Uluru is included in the thumbnail. This illustrates how the model can identify the best thumbnail tuned to the main object of the photo.
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