抄録
The basic printing process is classified into 3 such as letter press, offset printing and gravure printing. High Quality Printing process now gives us far better result in reproducing the colour which used to be quite hard to reproduce. The improvement of the reproduction has been realized mainly by the technique of increasing the graphic information (Improving the resolution) and improving the printing density.
When we interpret High Quality Printing in general sense, this can be classified into five methods ; (1) High Definition Printing, (2) FM Screen (Frequency Modulation), (3) High Density Printing, (4) Hifi Printing, (5) High Brightness Printing.
(1) High Definition Printing and (2) FM Screen are the printing methods to get higher quality by higher resolving power in continuous tone.
(3) High Density Printing gives us more solid and deeper effect in every colour like colour bromides by extending the limit of the colour density.
(4) Hifi Printing and (5) High Brightness Printing is effective in improving the saturation and the brightness by using the secondary coloured and fluorescent ink (red, green, blue-violet etc.) in addition to process colours (black, cyan, magenta and yellow) to extend the limit of colour reproduction.
The High Quality printing methods have currently ceased to be novel. However, they are still expected to be improved in both application and quality. It is necessary to establish especially the application and to prepare the hardware corresponding to recent development of digitalization in pre-press stage. It is also needed to develop the technique answering to the demand from the client for the quality.
