>>99711682early '70s actually
the reason it's used is because it was among the first handful of colour scans of images into a computer period, this means that every computer image-related study is able to be compared directly to historical studies by means of using the same source images, replacing them is not as simple as you think, as it defeats the purpose of using the same sources
>>99711686you should know the picture in op is the entire picture used for testing, the test image does not contain nudity