PCD File Format
The Photo CD images are scanned at a very high resolution and thus the images are large (3072 by 2048 pixels for the normal Photo CD service, or 6144 by 4096 pixels for the Pro Photo CD service), with each image stored in a separate PCD file. Each PCD file also contains smaller, scaled down images of the large image.
I understand the PCD file format is compressed, possibly using patented methods.
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