Analyzing the similarity between two images from different sources

Is there a way to determine if an image has been loaded on a webpage using Selenium IDE?

I tried generating a hash value of the image with javascript, but it wasn't possible. Then I discovered that you can base64 encode an image by loading it into a canvas and calling toDataURL(). However, this method doesn't work for images located on another domain.

My image server displays a standard "image not found" image. I want to confirm if a specific image was successfully loaded by comparing it to the failure image. Any suggestions on how to achieve this?

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