Download, Crop, and Resize 100 images.

I need 100 square texture images of 600x600 pixels each. The full-size rectangular images can be downloaded from the website: [login to view URL] The freelancer will download an image from the website, crop the longest side so that the image is square with the shortest side, and the reduce the image to a 600x600 pixel size. For example, if the downloaded image is 1500x1200px, the freelancer will crop the 1500px side to 1200px by cropping the top by 150px and the bottom by 150px to obtain a 1200x1200px picture. This picture will them be reduced in size to a 600x600 sized picture. It is important that the center of the original image remains in the center of the final image so that the initial cropping from a rectangle to a square must be done evenly on the top and bottom (or left and right). It is also important that the photograph not be reduced in size before cropping. The final product will be a zipped file containing all the pictures that I can easily download.