Oce CS120 Reference Manual page 98

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The Text/Photo Priority function enables you to adjust the text and photo
differentiation priority level so that copies are reproduced at a higher quality. Give
priority to Text when making copies of originals with fine and faint characters. When
making copies of originals with photos that you prefer to reproduce clearly, set the
Photo priority higher.
Adjusting the Copier (Adjustment/Cleaning)