Pictures in different resolutions next to each other

[Jonas30518788gdux]

I have a problem. I'm trying to display a door in 12MP and a door in 200MP next to each other. I don't want to scale up or down either of the images, but display them next to each other for a comparison. How do I do that? I cant copy and paste them into the same picture since either or both will scale. I have taken the same pictures in different resolutions, and with several phones and want them next to each other somehow for a comparison.

[Kenneth Kawamoto]

If you want them to appear in similar sizes you cannot avoid scaling at least one of the images as one is 16.6 times larger than the other.

[Conrad_C]

What is the goal of the comparison?

A. If the goal is to show the doors so that they all appear to be the same size, then you can’t avoid scaling at least one of them. The pixel density of at least some of the images must be scaled.

B. If the goal is to show the doors at consistent physical dimensions (equal scale relative to each other, so that a door that is larger in real life appears larger than others), then there must be something in all photos that can be used as a scale reference, like a ruler or another object of known dimensions.

If you want all photos to have the same ppi resolution (pixel density), then one solution is to set them all to the same real-world scale (which requires meeting goal B), and then resample them to the lowest common denominator. In this example, the 12MP image doesn’t need to be changed, but the 200MP image needs to be resampled to 12MP. Then the two photos, which are now both 12MP, can be placed into the same document and neither will need to be scaled.

[J E L]

@Jonas30518788gdux, this might not be want you want or need, but I had to do this for a client one time. I took screenshots of the image size panel at each size and pasted them into a new document for a side-by-side comparison. You could further crop out the size information to just show the image. Other than the suggestions from @Conrad_C and @Kenneth Kawamoto, I don't know how else to do it, either. What exactly is your end use goal in terms of publishing the results?

[D Fosse]

Quite frankly, 12 MP should be perfectly adequate for any practical purpose. Classic cameras like the Nikon D3 or D700 were 12 MP cameras. We used that for magazine spreads.

So I'm wondering where the 200 MP file came from, and how? That's an enormous file, bigger than you get from any commercially available camera today (including medium format) and again, way more than you need for any practical purpose.

If you scale (a copy of) the big one down and put them together, you have a 24 MP image. Is that not enough?

[J E L]

Yes, @D Fosse, I also wondered if @Jonas30518788gdux was really talking about comparing a 200MP phone camera. The Samsung Galaxy S23 Ultra comes with a massive 200 megapixel camera. So the comparison would be interesting to see.

[D Fosse]

200 megapixels, through a tiny plastic lens?? Are they serious?

[J E L]

Ha, sounds like a marketing gimmick to me. Samsung Notes went from 16MP down to 12MP in their new models a few years ago, and it was really disappointing. Talk about going from one extreme to another!

[D Fosse]

Maybe NASA will want one for the next space telescope. It can probably just send an MMS...

😄

[Nancy OShea]

I'm guessing it's a Drone cam comparison.

[NB, colourmanagement]

Not understanding, if you display them alongside each other at the same magnification then one will be tiny,

is that what you want?

What's the "door" you mention? might help us understand 

I hope this helps
neil barstow, colourmanagement net - adobe forum volunteer - co-author: 'getting colour right'
google me "neil barstow colourmanagement" for lots of free articles on colour management