Exporting an image changes the dimensions?

DxO PhotoLab
1

I’m new to Photolab (still in the 30-day trial) and am loving it so far. Today I ran into a strange problem that I couldn’t figure out.

I’m preparing for a photo exhibition and need to print 4 images in 30x40cm. I cropped the 4 photos in 4x3 aspect ratio. I then used one of my export-to-disk presets. Output is set to 300ppi, no resizing. The resulting jpg is 34x45cm. If I open the jpeg in Photoshop it shows the image size as 34x45cm @300ppi. If I use the crop tool set to 30x40 it covers the entire image. I don’t understand how both can be correct. Am I doing something wrong, or do I have the wrong understanding of what is happening?

2

Welcome aboard!
I’ve just made a test: everything works fine (PL9 / W10).
I’ve made a crop from 3:2 to 4:3 in a file from my R6 mark II (6,000*4,000).
Here are the parameters for the export and then what can be seen in Photo Shop Elements: 40x30 cm

30x40 PL9
30x40 PL9816×703 64.4 KB

30x40 PL9 in PSE
30x40 PL9 in PSE1211×559 72.4 KB

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3

Hi and welcome here.

As @rsp showed, you need to set the output size!
Otherwise you always end up with something else.

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4

Output is set to 300ppi, no resizing.

I think: No resizing → cm calculated from width in pixel.

Example:
Photo aspect 4:3 - Export No resize

image
image414×231 4.16 KB

Photo aspect 4:3 - Export Resize - Longest side: 40cm

image
image414×231 4.19 KB

Note: You also can set ppi or ppm in export

image
image815×568 26.8 KB

Note: PPcm = PPI / 2.54 (300ppi approx 118,11 ppcm)

Note: If you print to yourself from PL, in the dialogue you setup the cell size, something like this

image
image1068×974 71.3 KB

Note: if you use some other app to print, like Epson Print layout, you also can setup cell size:

image
image1790×1030 102 KB

5

Thanks everyone. The answer seem so obvious now. I wasn’t used to doing that in Lightroom so it never came to me. Thanks again for the help.

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