P: Additional options needed when exporting

Awesome, good thing you did the experiment, we can learn from it.

I first learnt this issue when I did a job for a client, and after handover he called me to say, i should really apply more noise reduction in post to my higher ISO images, only to find out, that on a mac, when he previewed in the finder window, the preview shows a terrible, noisy copy of the image, but when you open the image in photoshop or even a basic photo app, the images looked perfect, like you had seen when editing.

You can just imagine how many people after seeing their preview went back into Lightroom and destroyed their images by increasing adjustments, not knowing it was actually just a terrible preview. 

Printing or viewing full res in a photo programme is always the true test for me.

You are totally correct.
Copied the image in Lightroom folder in photos on the Mac into iCloud folder, and viewed on the iPad.
The image looks worse from iCloud, but it’s the same image file.

And to think I was about to chuck my toys out my pram

Okay, I’m going to give that a go now.
That’s a point I didn’t think about that.

Interesting findings.

Just make sure of the following. Like what you find on a mac, when you preview a image, it looks terrible in the finder window, but when viewed on a application like photos, it looks way better.

What you may find is that files app is designed to preview the image at a certain quality. So when a low res image is previewed it looks way better, but a high res image looks bad, because of the way the files app renders the preview downgraded. The photos app may be suited to preview a high res file way better.

Non of the above really have anything to do with the actual quality of the original image, that either gets printed or ultimately used in a particular way, like a website.

The reason id suggest it doesn't make a difference is because Lightroom mobile first renders the file before you decide which folder to save to. Ive printed from both high res rendered to photos and files app, both are identical.

I am sure if you simply moved the images from the files app to photos, you should get the same results.

This is my guess.

Okay worked this out. This is all on the iPad Pro.

If from the iPad I export to camera roll at full res, it looks good.
Export to files and ask for full res, then not good.
Export at lower res to files, and even lower res looks good.

So I’m guessing when you export to camera roll, it’s exported for a iPad screen?
And export to files for print or other??

If this is the case, Adobe should of made this clear.

I only stumbled over this after exporting images last night, and thinking why do they look so compressed or lower res.
I’m guessing it’ll be fine for printing, but looking at them on the 12.9 iPad screen, they don’t look good. In Lightroom CC fine.
I thought I’d found a perfect setup, mac and iPad and having everything linked up.
If it’s not fixed, then I’m going to have to look elsewhere for a solution. Most of the time I’m looking at images on a screen not for print.

I just bought Lightroom CC and wish I had known ahead that there was no way to change the dpi settings. It's very frustrating not to have that since I do need to submit things to print as 300dpi. I can't afford Photoshop.

It would be very useful to be able to export photos in jpeg format with the desired icc profile applied, like in lightroom cassic, so you can export the photos to be printed.

That would be outrageous and hard to believe (not impossible). There is more to workflow than Photoshop. Just give your customer industry standard export options: original, lossy and lossless. 

Locking every down also ensures that their entire Classic user base will never switch over, which should be their goal since they are leaking customers to Serif, Skylum, On1, Capture One and many others right now judging on comments and forums. 

Let's see... here is hoping that we'll get this for Christmas in the December update.

My prediction: lossless sharing between Lighroom mobile and Photoshop mobile (yay), but severely limited export options in Photoshop. This way you’re locked into using Photoshop mobile instead of Affinity Photo or other competitor products. I’ll eat my hat if something else happens.

I’ll believe the “Adobe has no interest in preventing you from using other products” line when I see it.