3, the practice of color management
There are many options for color management in Photoshop. Below, the author lists some of the situations that often occur in production and the solutions for reference.
1) RGB scan image with profile
Most middle-to-high-end scanner software currently used in prepress companies can customize the output profile, which lays the foundation for the user to create an ideal color management model, such as: Heidelberg scanning software NewColor can be directly in the "Profilmanager" The RGB output profile is defined in the menu. Just set the output profile in the scanning software to be consistent with the "RGB Settings" menu in Photoshop, so that the image is similar to the screen display in NewColor in Photoshop, which is an ideal color management in production.
Note: ICC profiles on the PC must be stored in the "Windows → System → Color" folder; in the MAC machine is stored in the "System Folder → ColorSync profile" folder, so that you can set the color in different software The corresponding ICC profile is called in the drop-down menu.
2) RGB scan image file without profile
Many inexpensive scanners do not support the scanning of profiles, nor do they provide IT8 standard manuscripts for scan correction. However, scan profiles can also be created for these scanners because the profile creation software is completely independent of the input device! By scanning a color IT8 standard document, you can also create a scanner profile. The scanners that come with these scanners usually do not support feature files. In this case, you must use the features in Photoshop.
Open the image in Photoshop, using Profiles Overview (Photoshop 5.x) or Convert to Profiles (Photoshop 6.x) in the Mode menu (Figure 2).
Note: After the scan profile has been created, the settings in the scanner and scanning software (such as brightness, contrast, etc.) can no longer be changed, nor can the scan software's automatic function be used, as this conflicts with the profile! If you really need to change the relevant settings, you must also re-create a profile that reflects the actual condition of the scanner.
3) RGB image files with "error" profile
What should I do when I open an RGB image with a profile embedded in it and the embedded profile is not the same as the color currently set in Photoshop?
If you select “Do not convertâ€, the image data will not change, but the color of the image on the display may change significantly; if you select “Conversionâ€, the image data will change, but the color of the image display may not be much different from the previous one. . Selecting "Convert" normally has better results, so it is recommended to "Automatically convert" or "Ask at opening".
You can do it in Photoshop 6. X uses "keep the built-in profile" so that the image is still displayed according to the built-in profile, which is a convenient way for RGB images that are eventually converted to CMYK mode. Do not use this menu if the RGB image is still in RGB mode at the end.
Note: Due to the inconsistency between the image-embedded ICC profile and the settings in Photoshop, the feature file mismatch dialog box appears when the image is opened in Photoshop. Normally, the conversion is selected.
4) RGB image file without a profile
If an RGB image file is not embedded in the property file, under normal circumstances, you can select a feature file most frequently used by the operator in the "From" drop-down menu in the open file prompt box, and select the corresponding in the "To" menu. CMYK or RGB mode.
5) CMYK scan data with profile
If you get a batch of scanned images while the scanner operator tells you the color separation settings for the scan, or provide you with the appropriate ICC profile, you can do this in CMYK Settings or CMYK Work Color Space. Make settings.
Note: In the CMYK setup menu, you can select or set the profile that matches the scanner. This will give you a better screen display.
From this point, we can also extend it slightly. We can sweep the image into RGB mode when the scanner scans. With the help of the ICC profile, we can use the same separation on each computer, whether it is a PC or a MAC. Setting, because sometimes image correction with RGB images has advantages over CMYK, such as using all filters. The RGB image is converted into a CMYK image before the final output; the same unfamiliar RGB image can be separated using a common separation property file. Many are avoided due to the uncertainty created by using the Photoshop "Color Settings" menu!