An image is split into a plurality of blocks, a feature quantity is extracted from each of the blocks, data is embedded into each of the blocks based on a difference between feature quantities of that block and at least one adjacent block, and data embedded blocks are printed. A feed plate resiliently urges a bundle of checks in the receptacle towards an opposed surface. A silicon-containing gas, an oxygen-containing gas, and a fluent gas are flowed into the substrate processing chamber.