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in PS, open a specific picture
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click "image" at the top of the interface and select "mode"
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in the expanded "mode" list, click to select RGB mode or cmky mode, etc< br />
layer by layer relationship, auxiliary filter, channel
can achieve a certain effect, master can restore through the region
1. Start PS software (assuming that the default mode of PS software is gray mode). First, take a look at the color of the original picture, as shown in the figure below
extended data
color mode
1, RGB mode
create color with red (R), green (g) and blue (b). The scanner captures information by measuring the amount of RGB trichromatic light reflected from the original image. Computer display also displays information by emitting RGB three kinds of color light to people's eyes
2. CMYK mode
uses cyan (c), magenta (m), yellow (y) and black (k) inks to print RGB colors. However, e to the purity of the ink, CMYK ink (also known as processing color) can not print out all the colors created with RGB light
Lab mode is a scientific method to describe color. It divides colors into three components: brightness (L), a and B. The brightness component describes the brightness of a color“ The "a" component describes the color range from red to green“ The "B" component describes the color range from blue to yellow. Lab color is a kind of color model used internally by Photoshop when converting different color models (for example, from RGB to CMYK)4, gray mode
gray mode uses different gray levels in the image, and each pixel in the gray image has a brightness value between 0 (black) and 255 (white). Gray value can also be measured by the percentage of black ink coverage (0% equals white, 100% equals black)
5. Bitmap mode
bitmap mode uses one of two color values (black or white) to represent the pixels in the image. An image in bitmap mode is called bit mapped 1-bit image because its bit depth is 1
6, two tone mode
this mode creates single tone, two tone (two colors), three tone (three colors) and four tone (four colors) gray images through one to four kinds of customized inks
7, index color mode
index color mode can generate up to 256 colors of 8-bit image files. When converted to index colors, Photoshop builds a color lookup table (CLUT) to store and index the colors in the image
8, multi-channel mode
multi channel mode image contains 256 gray scales in each channel, which is very useful for special printing. Multi channel mode images can be stored in Photoshop, PSB, Photoshop 2.0, Photoshop raw or Photoshop DCS 2.0 formats
This process splits the smooth color conversion into visible pure color levels. When it comes to gradients, it is also often called the cascade method or the strip method
10, variegated
a kind of dot pattern, similar to the snowflake dot on the screen when the TV can not receive the signal. This pattern is often used to blur the clear transition between two colors. It uses a variety of random edge shapes to replace the original straight transition edge
11, dithering
this method uses two solid color patterns to simulate a color (for example, adding a red dot pattern on the yellow area can create orange). The term also refers to adding a noise pattern to sharpen to make the edges less obvious
12, vector
images can be raster, vector, or a combination of the two. Raster images are composed of pixel grids, which make the images jagged when viewed close up, and make them blurred or jagged when magnified; On the contrary, the vector image is composed of smooth curves and straight lines (that is, paths), which can be scaled at any scale without recing the quality of the image. The most common program to create vector images is Adobe Illustrator
The unit of image resolution is PPI (pixels per inch), which is the number of pixels per inch. If the image resolution is 72 PPI, it contains 72 pixels per inch. The higher the resolution of the image, the more pixels per inch, the more details the image has, and the smoother the color filtering