Adobe Camera RAW Lens Correction

Adobe Camera RAW is part of Photoshop.

RAW is a proprietary format with which the camera records the information that comes in to the sensor when you take a photo. Unless you have a reader for that format, you can’t see the image.

Contrast that with, for example, JPEGs and TIFFs, which every camera and every computer can read.

Every camera manufacturer has its own RAW format. Nikon cameras record in a format named .NEF. Fuji cameras record in a format named .RAF, Olympus cameras record in a format named .ORF, and so on.

Photoshop can read all these different formats, but unless you have the latest version of Photoshop it may not be able to read the format for a recent model of a particular camera even if it can read the format for that brand of camera – that’s how specific the readability of RAW formats is.

If you open a RAW file in Photoshop it will open in Adobe Camera RAW. It will read the information and give you the option of tweaking it and then opening it in Photoshop ‘proper’ and tweaking it some more.

You then have the option of saving it in a number of different formats. There is PSD, which is Photoshop’s own format, and there are JPEGs and TIFFs and PNGs and… etc.

And now to the point of this article which is about lens correction and how versatile Photoshop is.

You may not know how much lens correction is possible in Adobe Camera RAW.

This is one of the screens you see in Adobe Camera RAW and on the right you can see ‘Lens Corrections’ and a set of sliders. (Click the image to see it larger)

I took the photo you can see at the top of this article, and I moved it around in Adobe Camera RAW using these sliders.

Then I opened it as a PSD in Photoshop ‘proper’ and used the Transform/Skew and Transform/Scale tools to tweak the image a bit more. And then I cropped it to end with the part of the image I wanted.

Here is the uncorrected ‘out of the camera’ version again, and then the corrected and cropped version. As you can see, with Adobe Camera RAW you can ‘swing’ the perspective around and see a completely different aspect of the photo.

Photoshop CS6 Crashing? It Might Be The Crop Tool

Photoshop CS6 has been crashing on me. The reason, as you will see when you read this, is a specific situation but one that has affected me and might be the rea

I have had Photoshop CS6 for a couple of years. I use it daily on a Mac running El Capitan. About three weeks ago Photoshop started crashing – particularly when I clicked OK after using the colour picker. But it can also run OK for several colour picker ‘clicks’ and then crash. Just now it crashed without me even touching the colour picker. Following advice from Pete Green of Adobe. at the weekend I uninstalled and used the cleanup tool and reinstalled – and it is still doing it. Pete suggested I attach a crash report, which I am pasting in here.

Chris Cox (Senior Computer Scientist at Adobe):
That’s an obscure issue that took a long time to figure out (cause and effect were very far apart), and was fixed in Photoshop CC 2014. Bottom line: caused by the crop tool, but doesn’t show up until you change a color.

I do not understand how the issue can only show itself now when I have been using CS6 – including the crop tool – for a long time without issue.

Is there a patch?

Chris Cox:
This bug was in Photoshop for a while, but it was very difficult to diagnose because the cause and effect were very far apart, and the specific cause far from obvious. We know that it was caused by using the crop tool, then later changing the colors.

Again, this is fixed in Photoshop CC 2014.

I still don’t understand how a bug can surface after two years of using the product and not before. I use CS6 daily and this issue only started happening a few weeks ago. To me that suggests that the issue has been introduced by some other factor, such as an update to Camera Raw or something. I don’t want to bang on about this and alienate those who can help me, but I like having the product on my machine rather than a subscription model – and in so far as it is possible to resolve the issue, I want help to do so.

Chris Cox:
No, Photoshop CS6 (13.x) is several versions behind the current version of Photoshop (CC 2015 – aka 16.1.2).

Er, even the subscription has the product on your machine. All that changes is the license.

Basically the bug requires very specific steps, which not everyone hits all the time.
No, we know the exact cause of this bug. To avoid this, don’t change the image zoom while using the crop tool.

Hoho – that’s it? Don’t use the zoom tool while using the crop tool? I can live with that.

Pushing Photoshop Sliders


I used the Nik Vivenza plugin and then Filter > Noise > Reduce Noise with the noise slider pushed all the way across to the max and the details slider at its minimum. After several passes, the images starts to take on a life of its own.

Click the image for a much larger version.

And here’s a closeup showing what I mean about the effect of using the noise reduction tool several times.