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There will come as exquisite techniques of the graphic arts in the future. The graphic will be used in many fields such as the artificial satellite, the cable TV, the interactive TV, the professional design systems, manufacturing the printing plate by desktop digital of the graphic information which makes possible to search from the world-wide museum, stocktaking, the new ways of marketing graphic media, and so on. Therefore the professional graphic designers must have the wide range of techniques and knowledge, and we have to be concerned about the ability, which is necessary to convey the information visually, and the visual arts. That includes the ability that analyzes, solves, and visualizes the problem: and the ability that can specify the graphic techniques of reappearance, printing techniques, and materials. Also, we have to think about the various media and many kinds of graphic reappearance which corresponds to them. Professional designers who edit the graphic images do not change the whole image at once in most cases. Accordingly we need have the methods of dividing the image areas, and there used the methods of making a stencil or a frisket for dividing the image areas. But inn general it takes a lot of time to make the stencil, and that is needed to be stored for later use. For these reasons, the stencil is stored by the type of grace scales, and we call it "mask". Therefore, in order to understand the needs of these activity, there should precede the understanding the masking activity used for a long time, in creating arts. The early mask starts as the voucher of contracts, by dividing bamboo (or jade, etc.) into twi pieces, and fitting the divided parts of those two pieces, and fitting the divided part of those two pieces each other. And the mask improved from the primitive ways had been changed to fitting the complicated imprint of a seal and engraving slide, and it has been developed into the techniques of compositing in the matte activity through the development of optical printing. And the 8-bit digital mask that has been developed is the gray-shadow-masking data to store in the art working images. It is two characters that there is discovered. One is available to store the selective objects. To Make the selective objects in the image application program, there is available to change the channel mask to use the store orders of the selective objects. The other is equal to the gray-shadow images in essence. To put it shortly, it is usable in the mask as well that there is usable to all kinds of the workable image controls in the gray-shadow images. Today, the understanding the positive and the negative of the developed mask, alpha channel, will make to possible to approach to various images easily, and will introduce us to the various techniques like image compositing, transition effects, image retouching, and so on.