In Gray Working Space, we should set according to the purpose of the corresponding grayscale image. For example, the grayscale image for printing can be set according to the Dot Gain of the printing process, such as the built-in DotGain20% or DotGain25%, and the user can also customize Custom Dot Gain. If the grayscale image is for display only, such as an online image, you can set it according to the gamma of the monitor you are using. For example, the Gamma value of a general Mac is 1.8. (See Figure 4)
Now Photoshop6 can also make Spot Color preview more accurate. We can select Dot Gain of Spot Color to make spot color display more accurate. But note that only one Dot Gain can be set here, so when the image has more than one spot color version, we can only make one of the spot color versions display accurately. (See Figure 5)
3. How to set up Color Management Policies
After setting up Working Spaces, you should understand Color Management Policies. Basically, we can keep the U..S. Prepress Defaults setting. The main meaning is to tell Photoshop what to do when the opened image has an ICC profile that is different from our Photoshop 6 settings. (See Figure 6)
For example, when a four-color image is archived, Embed has the ICC profile of the drafting company A, and we set the working space of the ICC profile of the drafting company B to CMYK in Photoshop6. Because the two are different, Photoshop The user will be asked to make a choice when opening the image:
1. Whether to use the Embed ICC Profile (Drafting Company A) in the image as the CMYK Working Space of this image (keep Lab and CMYK values ​​the same, but what you see is the color of the drafting company A).
2. Still change the color from the drafting company A to the current Working Space (that is, the drafting company B) (keep the Lab value the same, the CMYK value will change, what you see is the color of the drafting company B).
3. Or discard the Embed drafting company A's ICC profile without color management, but the displayed color is based on the current Working Space (printing company B). (See Figure 7)
Basically, we should make different choices according to different situations. If we want to see the direct output of this image and the effect of drafting in drafting company B, we should choose the third one. If you want to know the effect of direct output of this image in drafting company A, you should choose the first one. If we want this image to be drafted by drafting company B, but want to simulate the effect of drafting company A, we should choose the second one.
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