title: similarity search API of Watson Visual Recognition related to bulk volume of images
body: <p>We have a customer requirement to search similar images in a collection using Watson Visual Recognition. The documentation mentions that each collection can contain 1 million images. Thus, I have the following questions:</p>
  
  <p>a) What is the maximum size of the image?</p>
  
  <p>b) Each image upload takes up to 1 second and the standard plan has a limit of 25000 images per day. So, can only 25k images added to the collection/day? </p>
  
  <p>c) The customer has about 2 million images. How can we upload the images faster?</p>
  
  <p>d) Is there a separate plan available for bulk volumes?</p>