How to set the color space in Photoshop

Photoshop occupies a pivotal position in the field of image processing. Many people who work in prepress work do color separation and image adjustment work within Photoshop software. In order to convey the color accurately, the color management work must be done well in Photoshop. The color management of Photoshop is directly related to the color space conversion result of the image and the color display on the display. Photoshop's color management capabilities are constantly evolving, and almost every version has different color management capabilities. The general trend is that color management is getting better and better, and the application area is becoming wider and wider.

RGB workspace settings
The RGB workspace settings are used to set various RGB color modes such as movies, TVs, monitors, and scanners. Select RGB color space for different applications, the color management system obtains different Profile files, and the colors observed on the display will be different. The RGB setting has a great influence on the color display of the image and should be carefully chosen. The options for RGB settings are color space options such as monitor RGB, sRGB IEC61966-2.1, Apple RGB, Apple RGB (1998), and Color Match RGB.

1. sRGB IEC61966-2.1: Standard RGB space, suitable for a variety of hardware and software, recognized and supported by all software and hardware manufacturers, is the default color space for most scanners. In addition, the sRGB workspace can also be used for network images, but if you are doing prepress image processing, it is recommended not to use this color space.

2. Apple RGB (1998): Color space for Mac computer monitors. The gamut of this RGB color space has a fairly large range of color gamut and is particularly suitable for images to be converted to CMYK color modes. Using this color space requires printing with a larger color gamut.

3. Apple RGB: This is also the color space for Mac computer monitors. The color space supports a variety of desktop publishing software, and you can also use this color space to edit images that you want to display on a Mac display.

4. Color Match RGB: This is a match to the inherent color space of Radius Pressview displays. This space provides Apple Apple RGB (1998) with a smaller alternative color gamut for printing production. RGB settings only work on images displayed under Photoshop. The selected color space is different and the color rendering effect will be different. For example, a color block of CMYK color mode is selected under Apple RGB: RGB value is R193G170B120, CMYK value is C24%M25%Y46%K50%; RGB value is R206G185B142 when sRGBIEC61966-21 is selected. In other words, an ink color of C24%M25%Y46%K50% is expressed as R193G170B120 in the Apple RGB color space, and as R206G185B142 in the sRGB IEC61966-21 color space.

The color blocks of the RGB color mode are selected under Apple RGB: the RGB value is R210G121B89, the CMYK value is C11%M50%Y52%K0%; the RGB value is still R210G121B89, and the CMYK value is C17%M58 if sRGB IEC61966-2.1 is selected. %Y61%K2%. In other words, the RGB value is the color of R210G121B89. If they are the Apple RGB color space and the sRGB IEC61966-2.1 color space respectively, the values ​​will be different after the conversion to the same CMYK color space. This shows that the same color as the R210G121B89, the visual colors in the Apple RGB color space and the sRGB IEC61966-2.1 color space are different.

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