Master image processing ideas, methods and techniques

Picture processing is a complex work that combines technical and artistic skills. Not only does the technical aspect require the operator to be familiar with the entire printing process and to understand the relevant printability parameters, but the artistic aspect requires the operator to have a high artistic quality and aesthetic sense, only Only in this way can we accurately analyze and flexibly process all kinds of pictures and turn decay into magic! If there are errors in the basic color separation parameters of the image processing software, the image processing personnel's ideas and methods for color correction are unscientific, and the techniques for dealing with various picture types are not flexible, even if the post-plate making and printing links meet the required standards and specifications The quality will also be greatly reduced, so the picture processing link can be described as the top priority in newspaper printing, and its ideas, methods and skills need to be particularly emphasized. As follows:

(1) Image processing principle ◆ Both authenticity and artistry are considered ◆ “Color matching” and “Drawing” are parallel ◆ Must conform to human visual experience and psychological impression

(2) Preparation before image processing â—† Make necessary cropping choices according to the primary and secondary of the picture â—† Determine the size of the picture on the layout â—† Determine the picture resolution â—† Determine the picture color mode

(3) Image processing ideas â—† First analyze the characteristics of the picture, retain the advantages, and correct the shortcomings; (such as: tone level-normal, thin, thick, flat, brand-new; color-normal, partial color, special effect tones; In terms of clarity-clear and fuzzy)
â—† Adjust the ink first and then modify it locally; (for example, when using masks for local processing, you need to consider the surrounding environment characteristics to avoid distortion and inconsistency)

(4) Image processing methods and techniques â—† First of all: tone level and contrast adjustment? Black and white field calibration (level tool-Levels)
? Tone level adjustment (curve tool-Curves)
? Correcting insufficient contrast (brightness / contrast tool)
? Correct dark tone and level (shadow / highlight tool)
? Correct the middle tone thick stuffiness (exposure tool)
? Correct color cast (Color Balance Tool-Color Balance)
â—† Second: color adjustment? Correct hue and saturation (Hue / Saturation Tool-Hue / Saturature)
? Strengthen or weaken the color saturation (selective color correction tool-Slelective Color) certification? Local correction of light and dark (lightening, darkening and sponge tools)
â—† Again: Sharpness adjustment? Enhance sharpness (Sharpening Tool-Unsharp Mask)
? Reduced sharpness (blur tool-Gaussin blur)

Due to the poor whiteness and lack of luster of the newspaper, please pay attention to the picture processing:
(1) The overall contrast is sufficient (2) The medium tones are mainly used, and the dark tones are supplemented (3) The bright and bright colors are printed accessories, the basic color is saturated (4) The sharpening is appropriate, and the definition is sufficient

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