Lightroom image sizing

Forum|Forum|5 years ago
March 2, 2021
3 replies
347 views

When checking my images (from Nikon Z6) Windows Explorer indicates a size of 6064x4040 pixels whilst LR Classic v10 and PS v22.2 both indicate a size of 6048x4024 pixels - a loss of 16 pixels on width and height. If I transfer an image to DXo Photolab4 and apply lens sharpness and/or Prime noise reduction adjustments the image returned to LR has more detail around the edge of the frame than the original which seems to indiacte that the 16 lost pixels have been restored. Anyone else have this issue?

Problem or error

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TheDigitalDog

Inspiring

As Johan has correctly stated, not all sensor pixels are used for the image (some are used to collect white balance info).

Nothing to worry about here.

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

JohanElzenga

Community Expert

To elaborate on that: if Lightroom or Camera Raw has applied a lens profile, the image can become pin-cushion distorted ever so slightly as a result of that correction. To avoid seeing empty spaces in the middle of the image edges because of that distortion, it is cropped a bit.

-- Johan W. Elzenga

Bob Somrak

Legend

Sensor specs directly from Nikon site. LrC is reading what Nikon shows

M4 Pro Mac Mini. 48GB

JohanElzenga

Community Expert

The true sensor size is often slightly more. The reason for this is that demosaicing edge pixels may give artefacts, because you can only interpolate from one side. That is why Nikon and Lightroom cut these off, while another raw editor may not. Long ago I got into a discussion with a stock agent, who accused me of using interpolation to make my images bigger. I tried to explain to him (in vain) that I did not interpolate, but that my software (Apple Aperture at that time) also did not cut off the edge pixels. Because he continued to say that I did something wrong, I decided to slightly crop my pictures so they got the 'correct' size, just to make him happy.

-- Johan W. Elzenga

DdeGannes

Community Expert

If you are working with a .nef raw file check in the develop module and see under lens correction if there is an indication of “Built-in Lens Profile applied”.

This indicates that the camera you are using has placed that in the raw data file.

Regards, Denis: iMac 27” mid-2015, macOS 11.7.10 Big Sur; 2TB SSD, 24 GB Ram, GPU 2 GB; LrC 12.5,; Lr 6.5, PS 24.7,; ACR 15.5,; (also Laptop Win 11, ver 24H2, LrC 15.0.1, PS 27.0; ) Camera Oly OM-D E-M1.

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