Robg

I've started shooting in raw format and have noticed a few anomalies that I'm trying to understand. My camera is a Panasonic DMC-FZ300 with a 25-600mm (35mm equivalent) zoom.

When I look at the raw images in Google Photos there are clearly more pixels in the image than LrC is showing. It is as if LrC is cropping all four edges.

Another aspect that mystifies me is that when the lens is not zoomed, i.e., at its widest angle setting, the raw image displayed in Google Photos shows shadows (the lens hood?) at the corners, but when looked at in LrC those corners are cropped.

Below are four screen shots. The first two compare an unzoomed (25mm) image. The second two compare a fully zoomed (600mm) image. Although there are no obvious cropped corners in the latter pair, close examination shows that LrC has cropped the image, e.g., the rocks in the middle of the snow in the upper right corner.

One other difference to notice. LrC says the image is 4000x3000. Google says it is 4016x3016.

Can anyone shed any light on what is going on? Cropping the shaded corners in the unzoomed images is desirable. Does LrC "know" that my Lumix camera's raw images include pixels along the edge that should be cropped?

Although the cropping would generally be desirable on unzoomed images, is there any way to prevent LrC from doing the cropping in those cases where I would like to retain the pixels that have been removed?

FYI, these images are from Rocky Mountain National Park, near the Alpine Visitors Center at roughly 11,000 feet elevation.

Unzoomed image as displayed in LrC

(Download)

Unzoomed image as displayed in Google Photos


Zoomed image as displayed in LrC


Zoomed image as displayed in Google Photos

R.G. Loc: Scotland

It looks like LrC is applying lens corrections that Google Photos isn't.

Longshadow Loc: Audubon, PA, United States

Or a difference in the processing algorithms between the two programs.

lamiaceae Loc: San Luis Obispo County, CA

Google Photos? LrC? RAW? You talking about processing and viewing your images on a SmartPhone? Did you mean LrC or LrCC (on a computer)? They may based on appearance differ by more than 256 pixels.

Personally I shoot RAW and use only Ps & ACR, and the files and images are always sized as expected.

Hopefully someone else knows what you are asking and can help you out.

lamiaceae Loc: San Luis Obispo County, CA

That is a good idea. Like a "kilobyte" is actually 1024 bytes and a "megabyte" is 1,048,576 bytes.

Longshadow Loc: Audubon, PA, United States

Yup.

In ye olden days few people realized that 64K (a full blown machine) was actually 65,536 bits.

Rongnongno Loc: FL

Pay attention as to where the crop is taking place.

You have a greater issue at hand... What kind of weird lens do you have that does not cover the sensor?

LR is cropping according to the circle of diffusion... Created by the lens. This is not even an optic correction.

Linda From Maine Loc: Yakima, Washington

I believe you are correct. This happened to me with Picasa vs. PS Elements and the Canon SX50.

Re another of the OP's issues, with a wide angle lens on a Rebel dslr, I would get slight vignetting in the corners. ACR in PS Elements fixed it, though I don't recall if pixels were lost.

"Camera lenses can exhibit different types of defects at certain focal lengths, f-stops, and focus distances. You can correct for these apparent distortions and aberrations using the Lens Corrections tab of the Camera Raw dialog box.

Vignetting causes the edges, especially the corners, of an image to be darker than the center. Use controls in the Lens Vignetting section of the Lens Corrections tab to compensate for vignetting.

Barrel distortion causes straight lines to appear to bow outward.

Pincushion distortion causes straight lines to appear to bend inward.

The options in the nested Profile tab of the Lens Corrections tab of the Camera Raw dialog box correct distortions in common camera lenses. The profiles are based on Exif metadata that identifies the camera and lens that captured the photo, and the profiles compensate accordingly."

https://helpx.adobe.com/camera-raw/using/correct-lens-distortions-camera-raw.html

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Linda From Maine Loc: Yakima, Washington

The lens is not removable. This is a bridge camera or whatever the term is these days; I had a similar issue with the super-zoom Canon sx50.

CHG_CANON Loc: the Windy City

The Panasonic DMC-FZ300 user manual is available in the internet. Page 122 gives the pixel resolution of the image files. With the native 4:3 aspect, the camera's manual states it will deliver 4000x3000 sized images, in pixels (12MP). If you desire the trash around the RAW image edges beyond the 4000x3000 crop, well, don't use LR classic to process your RAW images.

User ID

Theres no difference between 3016x4016 and 3000x4000. That bit can be ignored.

JimH123 Loc: Morgan Hill, CA

Robin Whalley, Landscape Photographer in the United Kingdom, did a YouTube on this very problem. He showed how Lightroom was cropping some of the edges of a photo after lens correction. And he compared this to DxO Photolab, that was not showing this same problem even though it also was applying lens correction.

I would have to do some Googling to find it again, but his conclusion was convincing.

He also had another one that compared the corner sharpness between Lightroom and DxO Photolab and this was another area that Lightroom (actually ACR which processes the RAW and does the demosaicing and lens correction) was coming up short.

But he also mentioned that this problem was worse with earlier revisions of Lightroom and has gotten a little better with newer releases which tells me Adobe is aware of the problem.

Alphabravo2020

Is it not intuitive that a lens correction requires a crop? Any circular operation applied to a rectangular image will cause the image to be non-rectangular requiring a crop.

robertjerl Loc: Corona, California

Are the camera and the app set to the same aspect ratio and size for the image?

JD750 Loc: SoCal

Lots of interesting info about LR lens corrections resulting in cropping. Can you turn off lens corrections to see if that's it?

One other thought, do you have view - fit selected in the navigator panel on left side of lightroom?