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1991 was also the year Kodak started development on the Photo CD, a system for digitizing and storing photo negatives or transparencies on a CD-ROM (comprising a Kodak scanner with a CD writer and Sun Sparc minicomputer). Launched in 1992, the Photo CD could hold 100 photos and gained some initial traction with professional photographers by offering a cheaper, high-quality alternative to pricey drum scans. Consumer adoption was also promising at first, but the proprietary file format of Photo CDs was eventually surpassed by the growing popularity of the industry-standard JPEG format, which allowed for smaller file sizes with similar image quality. Kodak eventually abandoned the format without publishing the technical specifications, leaving photographers who'd embraced Photo CDs in the lurch (though a third party was able to reverse engineer the format, enabling various open source decoders).