Is it necessary to process JPG images in sRGB color space with AdobeRGB or Prophoto RGB color space?

When editing photos, you usually see that your output requirements have nothing to do with the color gamut of the display, unless your photos are finally displayed on a high color gamut display. At present, WINDOWS system does not support color management. Except for professional imaging software such as PS, most software defaults to SRGB. Display non-SRGB pictures under WINDOWS. If the software does not support color gamut management, it will generally be displayed according to SRGB, so it will be grayed out and opened with PS. If your display system is SRGB, PS will automatically map and display correctly.

If it is used for printing/developing, the color gamut must also be compressed to CYMK, because the color gamut of SRGB is larger than CYMK, so it will not affect printing or display.

Supplement:

The following figure shows the color gamut range of various devices defined by the International Commission on Lighting, taking CIE as the standard. ARGB and PRGB are larger than SRGB, but they do not represent the quality of image quality, but only the color display range, which means that the display with high color gamut is better and more eye-catching than the general display.

But you use a general monitor. It's the same whether you use ARGB or SRGB in PS, because your monitor is SRGB and you can't display the color of ARGB. In order to display the picture normally, PS will be compressed according to the color contrast and mapped to SRGB. Otherwise, the photos taken with ARGB are mapped to the color gamut of ARGB, and the display will be oversaturated, because the color gamut of ARGB is larger, and SRGB is like hitting a wall. On the other hand, a normal picture of SRGB will be grayed out on the ARGB display, because the range of SRGB is in the middle area of ARGB, the color values of the picture are all three channels, and the brightness of RGB is 0-255.

In other words, the same RGB: 255,0,0 full red pixels are different in red on devices with different color gamut, and the same display is the same no matter what color gamut you change for PS, because the color gamut of the device is fixed, unless you watch the demonstration (that is, the final output) in the future and use an ARGB display, that makes sense. You can then edit on the SRGB display with PS set to ARGB (the display used for editing actually uses the SRGB color gamut). When saving, the ICC configuration of ARGB, that is, the gamut mapping table, will be embedded. Then the display on the ARGB display will be normal.