Issue with both photoshop and Indesign

[Amado5FAB]

I have a PDF in Indesign consisting of black and white images in 300 dpi. I just needed to convert them to grayscale. So, last night, I converted most of the images to grayscale in photoshop and imported them to Indesign. I never finished since photoshop crashed and stopped saving images. Today, I updated both Indesign and photoshop. I find out afterwards that not only was photoshop still not saving my images. All my images in Indesign have reverted back to RGB and to add insult to injury, all my images were downsized to 72 dpi. Please help. I tried calling customer service for assistance ( on hold for at least an hour) and they hung up / disconnected without even a call back.

[D Fosse]

Did you relink in InDesign?

Aside from that - you may already know this; just for the benefit of others reading this - grayscale is a minefield. It's subject to standard color management just like RGB, but what few people know is that the default grayscale profile in Photoshop (dot gain 15 or 20%) is totally useless in any practical scenario.

That's fine inside Photoshop - but InDesign doesn't have grayscale color management at all. It treats all grayscale as black ink in whatever CMYK color space is used. That's a very different thing.

So you get tonal shifts, often quite severe.

What you have to do is set up Photoshop's working gray in the same way. Under working gray, click "Load Gray", and navigate to the CMYK profile in use. Now you can convert to that grayscale profile, and it will be handled correctly in InDesign. It will look like this: