The Basic Way of Color Management in Photoshop (2)

In the Gray Working Space, we should set the use of the corresponding grayscale image. For example, the grayscale image for printing can be set according to DotGain of the printing process, for example, built-in DotGain20% or DotGain25%, and the user can also customize Custom Dot Gain. If the grayscale image is for display only, such as a web image, it can be set according to the gamma of the monitor being used. For example, the general Mac has a Gamma value of 1.8. (See Figure 4)

Now Photoshop 6 can also make Spot Color's preview more accurate. We can choose 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)

How to set up Color Management Policies

After setting up Working Spaces, you should understand Color Management Policies. Basically, we reserve the U..S. Prepress Defaults settings. The main idea is to tell Photoshop what to do when we open an image if the Emcaped ICC Profile is different from our Photoshop 6 setup. (See Figure 6)

For example, when a four-color image was archived, Embed wrote the light powder ICC Profile of the company A, and we set the light powder ICC Profile of the company B as the working space of the CMYK in Photoshop 6. Because of the difference between the two, Photoshop Ask the user to make a choice when opening the image:

1. Whether to use the ICC Profile (printing company A) Embed in the image as the CMYK Working Space of this image (keeping Lab and CMYK values ​​the same, but what you see is the color of the company A).

2. Convert the color from the copying company A to the current Working Space (namely, the copying company B) (The same holds the Lab value, the CMYK value will change, what you see is the color of the proofing company B).

3. We discarded the ICC profile of the company A of Embed, and did not perform 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, we must choose the third in the effect of the drafting company B. In order to know the direct output of this image, the first one should be selected for the effect of the company A. If we want this image to be written in the drafting company B, but want to simulate the effect of the copying company A, we should choose the second one.