This panorama of Montreal’s cityscape for Heritage Montreal is made of 53 vertical pictures stitched together. The images were captured from atop the Tour de Lévis on Ile Sainte-Hélène. The original file is 71,243 pixels wide. Something to have your computers working!
The largest image size supported by a PSD file is 30,000 by 30,000 pixels. Then files are saved as PSB with image size up to 300,000 by 300,000 pixels.
Below is a smaller version of the panorama. Take a closer look!