What Is a Clickable Image?

Pictures refer to flat media composed of graphics, images, and so on. There are many picture formats, but they can be divided into two categories, bitmaps and vector graphics. Bitmaps are commonly used in BMP, JPG and other formats, while graphics in SWF, CDR, and AI formats are vector graphics.

[tú piàn]

Picture refers to

Dictionary explanation

Figure: Basic terminology in technical drawing, referring to points,

BMP format

Social life: pictures that reflect life

Social documentary: true reflection of people or events with real effect, disaster, war, poverty, etc.

Tourism folklore: some landscape pictures taken by people who love photography and tourism

Folk Customs: Pictures recording folk customs, habits, beliefs, celebrations, etc.

Old photos: photos created by photographers 30 years ago

Natural Scenery: Included

• In addition to the basic grayscale " red green blue " (foreign language abbreviation: rgb) or " cyan, magenta, yellow, black " (foreign language abbreviation: cmyk) and "lightness- ab " (foreign language abbreviation: lab) modes, Photoshop supports (Or process) other color modes, including bitmap mode, grayscale mode, duotone mode, indexed color mode, and multi-channel mode. And these color modes have their special uses. For example, an image in grayscale mode has only grayscale values and no color information. Although indexed color mode can use colors, compared to rgb mode and cmyk mode, there are very few colors that can be used. Here are some of these color modes.

  First, the bitmap (bitmap) mode

  Bitmap mode uses two colors (black and white) to represent pixels in an image. Images in bitmap mode are also called black and white images. Because its depth is 1, it is also called a one-bit image. Because bitmap mode only uses black and white to represent the pixels of an image, a lot of details are lost when the image is converted to bitmap mode, so Photoshop provides several algorithms to simulate the lost details in the image.

  When the width, height, and resolution are the same, the image size of the bitmap mode is the smallest, which is about 1/7 of the grayscale mode and 1/22 or less of the rgb mode.

  Second , grayscale mode

  Gray mode can use up to 256 levels of gray to represent the image, making the transition of the image smoother and more delicate. Each pixel of a grayscale image has a brightness value between 0 (black) and 255 (white). Gray values can also be expressed as a percentage of black ink coverage (0% equals white and 100% equals black). Images produced using blackfold or grayscale scanners are often displayed in grayscale.

  Three, duotone mode

  Two-tone mode uses 2-4 color inks to create an image composed of two-tone (two colors), three-tone (three colors), and four-tone (four colors) mixed in color gradation. In the process of converting a grayscale image to a dual tone mode, the tone can be edited to produce a special effect. The most important use of the two-tone mode is to use as few colors as possible to represent as many color levels as possible. This is important to reduce printing costs, because when printing, each additional color tone requires a larger cost.

  4. Indexed color mode

  Indexed color mode is a commonly used image mode on the Internet and in animation. When a color image is converted to an indexed color image, it contains nearly 256 colors. Indexed color images contain a color table. If the colors in the original image cannot be expressed in 256 colors, Photoshop will choose the closest colors from the available colors to simulate these colors, which can reduce the size of the image file. It is used to store the colors in the image and establish a color index for these colors. The color table can be defined during the conversion process or modified after claiming to index the image.

  Five, multichannel (multichannel) mode

  Multi-channel mode is useful for images with special printing requirements. For example, if only one or two or two or three colors are used in the image, using multi-channel mode can reduce printing costs and ensure the correct output of image colors.

  Six, 8-bit / 16-bit channel mode

  In the gray-scale " red green blue " (foreign language abbreviation: rgb) or " cyan, magenta, yellow, black " (foreign language abbreviation: cmyk) mode, a 16-bit channel can be used instead of the default 8-bit channel. By default, the 8-bit channel contains 256 color levels. If it is increased to 16 bits, the number of color levels of each channel is 65536, which can get more color details. Photoshop can recognize and input 16-bit channel images, but there are many restrictions on this type of image. All filters cannot be used. In addition, images in 16-bit channel mode cannot be printed.