Black & Cyan 2 color data

[misayanagawa]

Hello I am from Japan and my mother wants to ask this question. She does not understand English and basically I am her translator. Please forgive me if my explanation is as understanding as it could since I have a little knowlege of Photoshop software.

She is making black and cyan data.

1. Paste monochrome tiff data on black channel.

2. Copy the black channel (1) and paste other monochrome tiff data on copied black channel (1).

3. Change the copied black channel (1) to CMYK and color it cyan.

4. Save the file (.psd)

5. Place the saved file on indesign.

Saved file does not show copied black channel. How can she make it show with CMYK data?

Thank you in advance for your help.

[barbara_a]

From your explanation, I am not sure what your mother is trying to achieve. A picture would be helpful.

With a CMYK, there are 4 color channels. If you copy a channel, it becomes an alpha channel. An alpha channel is not a color channel; it is a saved selection and therefore it does not have any color information in it. That is why it doesn't show in InDesign.

If your mother wants only 2 colors, maybe she needs a duotone. To get a duotone in Photoshop, open or create a file. Convert the file to grayscale (Image > Mode > Grayscale). Then choose Image > Mode > Duotone. The duotone dialog will appear. Photoshop has many built-in duotone choices (you can also make your own). In the screen capture below, cyan bl 1 is chosen, which gives a combination of black and cyan. 

[c.pfaffenbichler · Accepted solution]

Could you please post a screenshot with the pertinent Panels (Toolbar, Layers, Channels, Options Bar, …) visible? 

Indesign would only process the four CMYK-Channels unless the additional Channel is a Spot Channel. 

One could also use Layers with only black content 

and Channel Mixer Adjustment Layers to transfer it to another CMYK-Channel. 

[misayanagawa]

Firstly, my mom and I appreciate very much for your prompt and detailed explanation.

She used the advises and was able to achieve what she intended to do.

Again, thank you so much for your knowledge!!

[c.pfaffenbichler]

You’re welcome. 

Asking you to transate may have been a good idea of your mother’s, because while the Forum has a translation function the translated results are not always very well understandable.