Dot Etchers

Increase or reduce size of photographic dots by chemical or photomechanical methods to make color corrections on halftone negatives or positives to be used in preparation of lithographic printing plates.

Job Task

• Places masks over separation negatives or positives and exposes film for specified time, using contact frame and automatic film processor to reduce size of photographic dots to increase or reduce color.
• Prepares photographic masks to protect areas of film not needing correction, using contact frame and automatic film processor or by manually cutting masking material, to correct color by photomechanical method.
• Compares proof print of color separation negative or positive with customer's original copy and standard color chart to determine accuracy of reproduction.
• Examines film on light table to determine specified color and color balance, using magnifying glass or densitometer.
• Identifies and marks color discrepancies on print and film.
• Applies opaque to defective areas of film to block out blemishes and pinholes.
• Determines extent of correction and exposure length needed based on experience or predetermined exposure and color charts.
• Prepares dyes and other chemical solutions according to standard and applies solution to inaccurately colored areas of film to correct color by chemical method.
• Blocks out or modifies color shades of film, using template, brushes, and opaque.

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