Why are you Exporting them to open in Photoshop?
The size in inches or cm/mm is determined by the number of pixels horizontally and vertically and the Resolution you have set in the external editing tab.
If you have an image that is 6000 pixels by 4000 pixels, a 24MP sensor camera, at a resolution of 300 pixels per inch that image would be 20 inches by 13.33 inches. If I set the resolution to 240 it would be 25 inches by 16.66 inches. If I set the resolution to 72 then that same image would be 83.33 inches by 55.55 inches.
In Photoshop go to the Image menu item then Image Size. That will show you what resolution your images are coming into Photoshop with. In Lightroom go to the Edit menu item and then Preferences then the External editing tab and see what resolution that is set to.
For your images to be 1.5 meters by 1 meter at the equivalent cm resolution of 300 pixels per inch, 118.11 pixels per cm, you would need 17716.5 pixels on the long side and 11811 on the short side which mean you would need a 209MP sensor camera.
Please help me?
I am editing a photo shoot and will need to print some photos on canvas. My original images are large and high in quality, around 1,5m x 1m if I open them on photoshop and check Image Size.
The problem is: I am editing the photos in Lightroom, and no matter what I do, every time I export my photos once they are edited Lightroom changes the size for max 45cmx30cm. Why is this happening if I am not resizing the file, or setting this up when importing/exporting. Could someone please help me?
It's happening because the numbers shown in meters or centimeters are meaningless. You are being confused by meaningless numbers.
Instead of the meters or centimeters, you should be looking at the number of pixels. The number of pixels in the image you send to photoshop is the same as the number of pixels in Lightroom.
Furthermore, if you have, for example 4500x3000 pixels in your image, this photo could be printed 1.5mx1m or 45cmx30cm and many sized in between, using the exact same photo, regardless of whether or not the software says the photos is 45cmx30cm or something else. One photo can be printed at many sizes.
So please, the important number is pixels. Please ignore the 1.5m x 1m and ignore the 45cmx30cm.
I'm having the same issue. I imported RAW filed to work on. Lightroom says this is the size of the image. Yes, I cropped it so it should only export as a little smaller:
And all of the export settings are correct, nothing is set to change the size of the file. But when I look at the exported file size, it shows this:
So I'm not really sure why that is. Any ideas?
Please post a screen shot of the Export dialog, showing the relevant settings.
There's nothing wrong with your settings as far as I can tell.
But I'm curious about the Image dimensions screenshot in your previous post. What application is it from?
And can you see pixel dimensions in the Finder? (I'm not familiar with Macs)
Try opening the exported image in Photoshop, or import it back into Lightroom, and check the pixel dimensions.
Can you go back to Lightroom and double-check that the original really is 2394 x 3591?
May be you accidentally looked a different image that had a different crop applied to it?
Does the problem happen only with this file? If so, try checking Resize to fit and enter pixel dimensions. The file could be corrupted in some way.
If it happens to all files, try resetting the preferences - Resetting the lightroom preferences file - updated - Lightroom Forums
If that doesn't work, uninstall and reinstall.
Does the Mac Preview show you the size on the screen, or the actual size of the file?
If you import this exported photo back into Lightroom, what size does Lightroom say it is?