Well, not exactly but perhaps a mini HDR; but a very useful one at that. There are numerous articles, Web tutorials, books written about the high dynamic range image processing, and for a good reason. The process yields remarkable results with detailed highlights and detailed shadows. Images obtained from HDR processing encompass a range of tonalities that would not be possible to capture on film or in digital sensors. After all, who does not want to have a film or a digital sensor that doubles or triples the EV range, maybe even more?
I have used this technique with excellent results, the opening image is one example and it is also a 7-photograph stitched panorama (click to enlarge.) But, I want to talk about using the same tool I use to process my HDR images, Photomatix, for a different purpose that does not require advanced planning. This use that I will present here has been generally ignored in most of the articles, perhaps because it is not “real HDR” but who cares. It produces really good results for difficult images.
My intention is not to present a full tutorial on how to use Photomatix for HDR, I will present you with the initial screen with the default settings, then show you the completed version with groups of settings following that. If you carefully review the small gallery of images at the end you will get an idea of how the process works.
Can Do Work In Photoshop, But …
Adobe Photoshop handles processing HDR images, even saves them in an HDR file in radiance format. Optionally, it can tone map the image to a low dynamic range so that we can display and print it. However, the tools it provides are not as easily usable as the tool of my choice, Photomatix from HDR Soft.
Typically, one would select 3-5 photographs exposed 2EV’s apart, ranging from -4 to +4 in RAW format. Then Photomatix opens these RAW format files and processes them to generate one HDR file that cannot be directly displayed on a normal monitor because of the great range. This file can be saved in one of the available formats in 32-bit, which is not a bad idea at all.
Photomatix Is Easier
Then, using the second component built into Photomatix, one creates a tone-mapped version that has a dynamic range that is suitable for displaying and printing, with or without further adjustments. Tone mapping is a required step until we can all afford an HDR monitor, not very likely at $20K; or the price of that beast comes down. Essentially, without tone mapping, this process is not of much use.
One of the capabilities of Photomatix is to create a pseudo-HDR file from a single RAW image file. It does not do this by some form of trickery, but by converting the full range of RAW format to an HDR file.
With today’s digital cameras with their 14-bit image capture, there is quite a bit of information that can be used if properly processed. It is a matter of choosing the portion of the dynamic range in processing and tone mapping that portion to the usable spectrum of luminosities.
When we develop a RAW file in a program like Lightroom, or Photoshop Adobe Camera RAW, we are doing exactly that. So, why bother using Photomatix for this purpose? First, we can see the full dynamic range, albeit in small sections at a time in a small viewport. Second, the tone mapping in Photomatix works well with problem images. Take a look at the following images (click to enlarge):
They are, the original RAW file, Lightroom processed, Photomatix processed. You may think that I purposely did a lousy job in Lightroom, but trust me, I tried to retain a similar dynamic range as I saw in the Photomatix processed image and some tonality in the sky. My attempts to add a more pleasing brightness to the whole image resulted in the sky being washed out, at least partially on the right side of the image. I know, I could have used the gradient fill available in Lightroom 2, selectively brighten certain parts, etc. But I wanted to keep the adjustments to a set of global adjustments, affecting the entire image in both programs.
Steps in Photomatix
The process is quite straightforward if you have Photomatix. If you don’t, you can download a trial version that is functional for 30 days I believe. So, here is how I do it in general and my settings for this image.
- Start Photomatix, you will see its spartan interface. Don’t let that fool you, more powerful parts are a few menu clicks away
- From the menu, follow “File/Open” and point to the RAW file you wish to process
Photomatix will load the file and process it according to the parameters set in the settings. At the load time, there are no more selections, it’s simple. After it is done, it will present the pseudo-HDR file and the small HDR viewer. The second image in the small gallery below shows the screen capture at this stage. Note that the HDR viewer is displaying the area pointed by the arrow in the middle of the image. At this stage, if you like you can save your image as an HDR file in Radiance format. Photoshop can open this 32-bit image file if you like and you can process it in Photoshop. I prefer to tone map in Photomatix because the controls are more powerful and also much easier to use. Whether you save it at this point or not, click on the “Tone Map” button on the toolbar.
The tone mapping interface has many controls. I will only present you with the initial screen with the default settings, then show you the completed version with groups of settings following that. If you carefully review the small gallery of images below, you will get an idea of how tone-mapping works.
When you like what you see, click on the “Process” button to tone map the image and save it as a TIFF file. The bit depth and the color space are determined by the preferences. This image is not finished to reflect my vision for it. But I will start in Photoshop with an image that will have the full range of information in the shadows and the highlights as well as mid-tones. From there, I will take it to where I want this photograph to go.
Take a look at the gallery now, it will give you a general idea of what is possible in a non-standard RAW processing engine. So, next time you have a difficult image, consider giving Photomatix a try. It may save the day.
Image list: 1. Photomatix screen, 2. RAW image opened and processed, 3. Tone mapping with default settings, 4. Tone mapping as I applied it, 5. HDR settings, 6. Tone settings, 7. Color settings, 8. Smoothing settings