Adobe PostScript Level 2 represents a significant evolution in page description language technology, building upon the foundation of its predecessor while introducing critical features for modern printing workflows. Released in 1990, this iteration of the PostScript standard addressed key limitations of Level 1, particularly in areas of performance, font management, and image handling. For professionals in publishing, graphic design, and commercial printing, understanding Level 2 is essential for leveraging the capabilities of legacy systems and appreciating the evolution of digital prepress. This version became the industry workhorse, establishing the baseline for reliable cross-platform output.
The most immediate impact of Adobe PostScript Level 2 was a substantial performance increase, achieved through a more efficient interpreter architecture. This "Level 2" engine processed commands faster and required less memory, allowing complex documents to render more quickly on both RIPs (Raster Image Processors) and personal computers. This efficiency gain was not merely incremental; it enabled the practical handling of larger, more detailed publications that were previously constrained by hardware limitations. These performance improvements were critical for meeting the growing demands of high-volume commercial printing environments.
Enhanced Image Handling with LZW Compression
A cornerstone feature of PostScript Level 2 was the native support for LZW (Lempel-Ziv-Welch) compression. Level 1 required documents to be pre-compressed before insertion, adding a step to the production workflow. Level 2, however, allowed the interpreter to handle LZW-compressed images directly. This included TIFF and EPS image files, which could now be embedded and processed in their compressed state. The result was faster file transfer, reduced disk space usage, and streamlined workflows for designers working with high-resolution photographic content.
Improved Font Management and Compatibility
Font handling saw significant advancement with the introduction of several new features in Level 2. The standard mandated better font substitution and fallback mechanisms, ensuring that documents would print reliably even when a specific font was missing on the output device. Key innovations included support for font hinting at various sizes and the introduction of the "ident" mechanism, which allowed printers to verify the exact font being used. These improvements drastically reduced the "font wars" and unexpected output variations that plagued early PostScript workflows, leading to greater consistency across different devices.
Key Features of PostScript Level 2 Fonts
| Feature | Benefit |
|---|---|
| Multiple Master Fonts | Allowed for dynamic interpolation between font styles (e.g., weight, width) within a single font file. |
| Type 1 Fonts | Became the standard outline font format, offering high quality at any resolution. |
| Font Ident | Enabled printers to confirm the exact font identity, reducing substitution errors. |
The Rise of Halftone Screening and Device-Independent Workflows
Adobe PostScript Level 2 brought sophisticated halftone screening capabilities directly into the page description language. It introduced advanced screening techniques, such as stochastic screening (FM screening), which produces higher-quality images with smoother gradations and sharper detail. Furthermore, Level emphasized device-independent color through the continued use of PostScript Color Management, allowing for more predictable color translation from design to print. This move solidified the role of the RIP as a crucial device, rather than just an interpreter, ensuring color accuracy and image fidelity.
For the printing industry, Adobe PostScript Level 2 established a robust and stable foundation that remains relevant, even in the PDF-centric era. Its optimizations for speed, its intelligent handling of compressed data, and its rigorous approach to font and color management set a new standard for print production. Many of the reliability principles and workflows established in Level 2 continue to influence modern print servers and digital output systems, making it a vital chapter in the history of digital graphics.
The legacy of Adobe PostScript Level 2 is evident in how it solved the critical challenges of the early 1990s, paving the way for the high-speed, high-fidelity printing we take for granted today. By addressing performance bottlenecks, standardizing complex workflows, and improving output consistency, Level 2 solidified PostScript's role as the indispensable engine of professional printing. Understanding this version provides valuable context for navigating both historical documents and the foundational concepts that underpin today's advanced prepress technologies.
