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3 Messages

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90 Points

Fri, Dec 27, 2019 6:53 PM

Solved

Lightroom Classic 9.1: Export jpg to jpg; cannot change resolution (Windows 10)

I scanned jpg images in full res of the scanner (4800 ppi), worked on the images and exported with the setting to max resolution 1920 pix per longer side. No matter what I tried, all exports were done with the original resolution. Is this a bug or am I missing something in the settings?

Responses

1.5K Messages

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19.1K Points

9 months ago

Original resolution isn't the same as original number of pixels. Did you get 1920 pixels as requested?

Author “Color Management for Photographers"

Champion

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5K Messages

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91.8K Points

9 months ago

Please post a screenshot of you Export settings window.

3 Messages

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90 Points

9 months ago

Apologies for being inconsistent with the terms, resolution / dpi, they are interconnected anyways. Originals were standard 24x36mm slides, scanned with max resolution, resulting in roughly 6400x4300 pix files. As output I wanted to have images with max 1920 pix per longer edge. Here are the settings of the part of the export dialog that handles resolution/dpi. 

799 Messages

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11.5K Points

9 months ago

What I remember hearing in a photo podcast is that the resolution setting in the image sizing section is completely useless, changing those numbers does nothing, means nothing.

Champion

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744 Messages

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13.3K Points

I would quit listening to that podcast as it is a false statement that the resolution does and means nothing. 
A couple reasons:

1) The resolution setting gets written into the export file metadata and this info is used in other programs such as Photoshop for automatic sizing purposes.

2) Resolution in the Lr export dialog is used when you use the "INCH" and "CM" criteria so Lr can automatically calculate the pixel dimensions of the export.

799 Messages

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11.5K Points

Well Robert, I just tried exporting the same photo with different resolution settings and, guess what? The exported jpg size is EXACTLY THE SAME regardless of what resolution settings you use, whether 1 PPI or 4800 PPI! Go ahead, try it!

This proves what the podcast said, the field isn't used, LR decides the best PPI for itself. Go Podcasters!

Champion

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744 Messages

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13.3K Points

Try this.   Guess what, the file sizes are different DEPENDING on the Resolution Setting.   Your Podcasters are misleading you.

Export #1 dialog settings with resolution 300

File info




Export #2 dialog settings with resolution 100

file info

1.5K Messages

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19.1K Points

You might wish to try this again. When I export a document with a FIXED pixel dimension but with 240 vs. 2 PPI in LR, the export is IDENTICAL except for the resolution tag (240vs2). As I expected, the value for pixels IS honored in LR's export, both exported images have identical number of pixels, they are the same size, the only difference is the resolution tag. As I expect, this tag has absolutely no bearing on the data other than this tag. An export at 1000 pixels at 240PPI is identical as an export at 1000 pixels at 2PPI. And as you can clearly see, the screen captures above show a different pixel dimension so yes, those two documents are radically different as expected.

Author “Color Management for Photographers"

Champion

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744 Messages

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13.3K Points

I agree 100% in your scenario Andrew but if you would have read closer I was exporting with "Resize" using "Inches" and "Long Edge" in the "Image Sizing" section and in that scenario the "Resolution" serves a useful purpose and is NOT useless a Carlos suggests.

The "Resolution" setting is also, as in your scenario, stored in the exported file and is useful when using the file in other programs such as Photoshop that honor this resolution when importing and can be automatically resized the the canvas psi settings.

I find the "Resolution" setting in Lightroom to be useful in special occasions and so do many others.

170 Messages

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4.4K Points

9 months ago

What is the correct way to export a photo to a smaller size?

Champion

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5K Messages

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91.8K Points

9 months ago

I just tested exporting with Resize To Fit: Long Edge, 1920 pixels, and it worked correctly in my LR 9.1 / Windows 10.  

Try resetting LR's preferences: https://www.lightroomqueen.com/articles-page/how-do-i-reset-lightrooms-preferences/

LR not infrequently soils its preferences file, and resetting it can fix all sorts of wonky behavior, including Long Edge not working:
https://feedback.photoshop.com/photoshop_family/topics/-broken-lightroom-export-resize-to-fit-long-edge

3 Messages

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90 Points

9 months ago

Thank you for the advice! Resetting LR settings was the solution. Also another issue was solved where importing images with "copy as DNG" didn't convert files into DNG. And as additional information, at least I didn't have to re-apply any deeper settings in the LR, only something like turning the solo-mode on. 

Champion

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5K Messages

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91.8K Points

9 months ago

Glad you got it resolved.