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Guides
Read the JPEG Committee and ITU-T format references, plus the current export and color-management documentation for the software actually used.
Pair this master guide with the exact product template and the maker's current software and machine manuals. The JPEG Committee explains the format; Adobe or GIMP explains a specific export interface; neither overrides material and equipment instructions.
Different guides answer different questions. Use a JPEG standard reference to understand the coding family, an application manual to understand its export interface, and the exact machine and material documentation to understand production limits. A helpful cross-reference should say which claim it supports, because a general article about JPEG cannot authorize a press setting.