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Chapter 3. Syntax > Functions

3.9. Functions

PDF is not a programming language, and a PDF file is not a program. However, PDF does provide several types of function objects (PDF 1.2) that represent parameterized classes of functions, including mathematical formulas and sampled representations with arbitrary resolution. Functions are used in various ways in PDF, including device-dependent rasterization information for high-quality printing (halftone spot functions and transfer functions), color transform functions for certain color spaces, and specification of colors as a function of position for smooth shadings.

Functions in PDF represent static, self-contained numerical transformations. A function to add two numbers has two input values and one output value:


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