News and Views from Dave Wilson

Tag: Adobe

Fotoshop by Adobé

by on Jan.10, 2012, under Photography

This is very nicely done and scarily true from what I read of the fashion press these days.

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Lightroom Tip – Using Colour Labels

by on Aug.14, 2011, under Photography

I had a discussion on Twitter last week with a professional photographer who was bemoaning the drudgery of editing large numbers of pictures. During the exchange, we talked about how we go about marking photos that we’ve downloaded but not yet got round to editing. His solution was to import everything into a single folder and, when he had edited them, move them to their final destination. I told him about the method I use which he has since adopted so I reckoned this may be a worthwhile tip to pass on. This is really part of a larger post I need to write on my overall digital workflow but, for now, here’s how I keep track of pictures in various stages of uneditedness in Lightroom.

The “Library” module in Lightroom offers you a great array of ways to mark photos – collections, star ratings, pick flags and colour labels. How you use these is entirely up to you but it’s a good idea to figure out some convention and stick to it so that you can use these markings to make your overall image management strategy a lot easier. Of these methods, I use three extensively – colour labels, star ratings and smart collections – and this post concentrates on my convention for the colour labels.

The first thing to note about the colour labels in Lightroom is that you can actually edit the labels to say anything you want. The default labels names “Red”, “Blue”, “Green”, “Yellow” and so on, are extremely obvious but entirely unhelpful. The first thing I would suggest doing is changing these to indicate what you are using the labels to signify. In my case, I’ve redefined 4 of the labels to allow me to define the following categories of picture:

“Review Required”
Images I’ve imported but not yet had a chance to do my usual post-import editing on (adding keywords, culling duds, selecting picks).
“Rework Required”
An image that I am partway through working on. This may be a tonemapped HDR that requires some Photoshop work or a Photoshop file that still needs some masking or layering operation completed.
“Unprocessed Panorama”
Images that are part of a set taken for a panoramic image but which I have yet to stitch.
“Unprocessed HDR”
Images that are part of a bracketed set for an HDR that I have not yet processed.

So how do you edit the label names? I had to go to the Lightroom help to answer this the first time but you can do this from the Metadata menu where you will find “Color Label Set” and, under this, an “Edit…” option. Just type the names you want and press OK. Now, whenever you right click on an image in the Library and select the “Color Label….” option, the list you see will contain your own label strings rather than the basic colour names.
The Metadata drop down menu in Adobe Lightroom 3
The colour label editing box in Adobe Lightroom 3
The Lightroom 3 context menu shows your colour label names after editing

Using these categories along with smart collections, I can easily see all the images in my library that fall into each of these categories. With one click, I can show all my unprocessed HDR brackets and pick one to work on, for example. To create a smart collection that allows you to view everything in one of these categories, click on the “+” next to “Collections” in the left-side panel while in “Library” mode then pick “Create Smart Collection…”. You will be shown a dialog box that lets you enter various conditions used to pick the images that will appear when you view the collection. My “Unprocessed HDRs” smart collection is defined as follows:
The dialog box in Adobe Lightroom 3 used to set up a smart collection

Note that I set up two conditions so that a picture is selected if EITHER the label color is green OR the label text is “Unprocessed HDRs”. This may seem like overkill but it’s a good idea since, if you happen to accidentally (or intentionally) edit the label names or reset them to defaults, the smart collection will still show the expected images.

That’s all there is to it. I now have four smart collections that give me single click access to all the images that need work of one kind or another done. After I do basic editing on the “Review Required” shots, I reassign the colour labels as needed, either setting them to one of the other categories or clearing them entirely. This allows me to move the images between states without having to worry about copying files on my disk. Lightroom handles all the searching for me.

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HDR Tip #4 – Dealing with Colour Fringes

by on Mar.03, 2011, under Photography

Senate Chamber, Texas State Capitol

Another of my golden rules for processing HDRs is to do as little as possible to the brackets in Lightroom before I export them to Photomatix for merging. The main reason for this is that I want to ensure that I don’t disturb the pixels in each of the bracketed exposures differently and run the risk of messing up Photomatix ability to merge the picture but it’s also because I think of Photomatix as the first step in the process. There are, however, two operations that I typically do before merging the brackets, one of which is cosmetic and the other of which is, in my opinion, absolutely vital.

The cosmetic operation is to correct the image white balance if I didn’t nail it in the camera. The important thing here is to make sure you apply exactly the same change to every one of the pictures in the bracket. Typically, I will correct the center exposure then use the Develop Setting copy/paste operation in Lightroom to apply the same setting to the other images. I do most of my colour correction or tweaking after Photomatix is done with the image but it’s always easier to start with images that are close to where you want to end up.

The more critical operation for me, however, is correcting chromatic aberration. This is a “feature” of lenses (typically cheaper ones, to be honest) caused by the fact that they focus different colour of light at slightly different distances and, hence, give slightly different magnifications to the red and blue channels in the image. This results in colour fringing along high contrast edges near the sides of the image. If you don’t correct this prior to merging, you will find that (a) you end up with an HDR that is less sharp than it could be and (b) the fringing effect will be magnified an enormous amount by Photomatix.

If you are lucky enough to be using very high quality professional lenses, you may never see this (I really only have to deal with it on my Sigma 15mm fisheye since the Nikon pro lenses I have are amazingly clear of CA problems) but most of the time it will be apparent if you zoom your image to 100% and take a look at the corners. If you are using Lightroom, correcting the problem is very simple. In the Develop module, look under “Lens Corrections”. If Lightroom knows about your particular lens (and it knows about a lot of lenses), you can click “Profile” then select “Enable Profile Corrections” and your CA problems will disappear immediately. Note that this also allows you to correct lens distortion and vignetting but I typically leave these set to 0 since I like the fisheye distortion and the vignette doesn’t worry me.

If Lightroom doesn’t know about your particular lens, click on “Manual” and fiddle with the sliders under “Chromatic Aberration” until the fringes you see in the image disappear (or get as small as you can make them). In both the manual and profile cases, make sure you apply exactly the same setting to all the images in your bracket then go ahead and export them to Photomatix.

I’ve added an example of before and after here so that you can see what I am talking about. The top image shows a 200% view of the top right corner of one of my brackets before CA correction and the bottom one shows the same section after automatic CA correction in Lightroom.

Before Chromatic Aberration Correction

After Chromatic Aberration Correction

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