Photoshop & Indesign - changing a colour

Question

Hi All,

Not sure if i am in the right place, but bear with me.

I have kind of been taught this by a previous manager, but I dont recall the steps, hoping someone here knows what I am referring to.

I have a file in photoshop supplied, its like a honeycomb texture. I need to create a spot colour the same as this, that my printers will print as white ink.

From what I recall, I have created a layer the same as the honeycomb shape. I have made it black. I should then be able to place the file in indesign, and selecting that layer only, change it to a spot colour (with the necessary attributes) that the printer will pick up.

Can anyone help me? I havent found a tutorial for it, and chat gpt has told me its not possible - but i know it is.

Thanks in advance,

Ally.

Stephen Marsh · Accepted Answer

You will need to make a copy of the file and save it as a 1-bit TIFF in order to colour it in InDesign. First using Image > Mode > Grayscale, then Image > Mode > Bitmap, selecting 50% threshold. As this is now "lineart", what is the effective PPI resolution of the image when placed in InDesign at final print size?

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