In the photo properties, the color indicates "not calibrated". What's the reason?

40D, even 40D, shake hands! Color representation is usually SRGB and ADOBE RGB. The commonly used one is SRGB. ADOBE RGB is used in printing and other industries and is more professional. For ordinary images, SRGB can be used. However, there is still some debate on which one is better. . . . Yours is not displayed. You probably forgot to set it. 40D setting color space: ————————————————————————————The common situation is as follows, including The default configuration of Windows monitor properties, Photoshop, ACDsee, etc. is sRGB. Even the Canon digital SLR camera manual says: "If you are not very familiar with Adobe RGB and color management, it is recommended to use sRGB." But if we look closely, we will find that this working space is an RGB working space developed by Microsoft and HP in 1996 to describe the color gamut of a typical display. It is suitable for Web image processing and is only observed on a PC monitor. It is only used for displays and has a very narrow color gamut. The color continuity (transition) is very low and cannot be used for printing or color expansion. In particular, blue-green output has greater problems. If you use sRGB to process an image and then color expand or print it out, some colors will be discarded. Adobe RGB is a practical color space proposed by Adobe in 1998. From the above figure, we can see that compared with sRGB, especially in the range from blue to green, part of the color gamut space is increased. Adobe RGB has the largest color gamut among the four workspaces provided by Photoshop. It includes almost all colors in the most commonly used CMKY color gamut and is also suitable for RGB printers and other output devices. With the rapid development of digital technology, digital cameras and scanners that support the Adobe RGB color space are now on the market. EIZO has also launched the ColorEdge CG221 monitor that fully supports Adobe RGB. The official training textbook for Photoshop image processing "The Art of Image Processing—Photoshop CS Implementation" ([US] Barry Haynes et al.) says this: "If you are a photographer and do not want to work in a custom RGB space (such as the color space of film) , it is best to choose the Adobe RGB color space. If you are engaged in professional web design work, you may need to choose the sRGB space." And some other authoritative books on Photoshop image processing also agree. To sum up, we should undoubtedly set the RGB working space in Photoshop color settings to Adobe RGB. At the same time, we should immediately set the color space of the digital camera we are using to Adobe RGB.