GRA 323 Chapter Notes -Prepress, Laser Printing, Halftone
5 May 2013
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5 tonal ranges: highlights, one-quarter, mid, three-quarter, shadows (average tonal ranges) Measuring in values of cmyk; highlights one-quarter tones mid-tones three-quarter tones shadows. Most of the colour information in mid-tone range. Rgb values should not be -10 on average. If -10, shadow areas will fill and lose detail when printed. Ideally, an image should have good contrast between light and dark tonal ranges. Majority of colour is to the left high key image in one-quarter tones. Majority of colour is to the right low key image in three-quarter and shadow tones. Use eyedropper tool to tell if your image needs colour correcting. Setting black and white points corrects 80% Rgb values should be equal, if not colour cast. If +245, light areas will appear washed out/lack detail when printed. Allows you to decrease/increase w/in various tonal ranges. More flexible than using variations, which can ruin image if overused. Can use levels too, but curves is better.
