photoblogography - Just some stuff about photography

Infrared photography with the E-1

in Olympus E-System , Thursday, November 18, 2004
Ok, I haven't written anything in this so-called blog for ages, but actually I've got a few things in the queue. The first is a brief write-up on using the E-1 for infra-red (IR) photography. Why IR ? Well it certainly gives a different perspective on things. Infrared photography uses either IR sensitive film, or an IR-sensitive digital sensor, to record an image at light frequencies lower than the human eye can detect, and to present a rendition of the scene which we can see. I have the distinct impression that whilst IR film is specifically designed to do this, digital camera sensors more or less do it despite the design. Most, if not all, digital cameras include an IR filter, I believe to reduce noise. This means that some are totally insensitive to IR, and those that are not require long exposure times, essentially to allow the light to leak past the filter. However, when IR photography does work with a digital camera, it has several advantages over film. First, IR film is very grainy (although some would not see that as a disadvantage). But the second is significant - you can check the exposure immediately after capture. This is significant, because exposure of IR film is largely guesswork and experience. There are no IR-sensitive lightmeters that I know of. A third advantage is the fact that you don't have all the problems associated with loading and developing IR film. wisteria1.jpg This image is a photo taken with Kodak High Speed Infra Red film, using a Hasselblad Xpan. The standard characteristics of IR photography can be seen - the bright vegetation, the other-world effect, and in the case of film, the very coarse grain. Note that this photo was taken handheld, probably at around 1/60th second at f8 or thereabouts. The same photo with the E-1 would take somewhat longer. A number of different IR filters are available on the market. Some allow a small amount of visible light through, giving a deep, dark red effect. But "real" IR filters are blocking filters, so called because they let no visible light through at all. They appear black to the human eye. I tried two IR filters on the E-1, a B&W 093, and a Hoya R72. The B&W was too dark, but the Hoya works well provided long exposures are used. It goes without saying that IR photography with the E-1 requires a tripod, for two reasons - one the long exposure, and two, you have to frame the shot first with the filter off. Some digicams, such as the Nikon Coolpix 950 (still highly regarded by the IR community), allow you to preview the image on the screen. After a bit of trial and error, I discovered that on a reasonably sunny day - and you need sunlight for IR photography - using the Hoya filter requires exposures of between 45 and 60 seconds, at apertures between f4.5 and f11. I also quickly discovered that at such exposures the E-1's sensor shows a lot of thermal noise. Fortunately, switching on Noise Reduction fixes this, although at the cost of doubling the exposure time, which really taxes the battery. ir_compare_1.jpg The two images above are 100% detail from a scene shot without noise reduction (left) and with (right). The image you get, after all this, is very red. Since the effect we're after here is to duplicate black & white IR film (colour IR film is another story altogether), we need to convert this to black and white. First of although you need to convert it from RAW (I don't recommend shooting JPG here). Don't use C1 for IR shots - obviously its well document difficulties with reds have a field day here. Use Photoshop ACR or Viewer/Studio, and ideally just go at default settings. If you use Photoshop ACR, you might see that the red channel is way overblown. Don't worry, but pull it back a bit using Exposure. Next, converting to black & white: Photoshop has several tools for converting to black and white, the most obvious being Desaturate. Don't use this. Use the Channel Mixer, preferably as an adjustment layer. The actual values you dial in to the Channel Mixer are a matter of taste, but generally most useful information is in the Red and Green channels - Blue is pretty noisy and dark. channelmixer.jpg The image below was taken with the E-1 is bright afternoon sunlight, with an exposure of 60 seconds at f/11. In this case arguably it was slightly over-exposed. It was processed using the Channel Mixer settings shown here. Arosio_041117-000096.jpg So, in conclusion, IR photography with the E-1 works and is good fun. Long exposure times mean that you will need a still day, or will accept (or welcome) wind motion blur effects. It is different to film IR, but well worth exploring it its own right.
Posted in Olympus E-System on Thursday, November 18, 2004 at 07:28 PM • PermalinkComments ()

Andy Rouse. Me, jealous ?

in Book Reviews , Friday, September 03, 2004
I've just finished readding Andy Rouse's wonderful book, Life in the Wild: A Photographer's Year. This has to be one of the best nature photography books around. Andy writes almost as well as he photographs, and his style makes it far from the usual ponderous "a photographer writes" stuff but does not fall into the trap of trying to be funny at the expense of being interesting. Andy is pretty prolific - he also contributes regularly to Nature Photographers Online Magazine", writes reviews for UK online retailer Warehouse Express, writes for Practical Photographer, wins lots of prizes, runs tours, and generally seems to pretty much on the ball. I thoroughly recommend "Life in the Wild" - it takes you from Andy's back garden (almost), to the Arctic, to Africa, to India and back. A wonderful journey from which he brought back some stunning photographs. I'm sure almost any "outdoor" photographer would enjoy it.
Posted in Book Reviews on Friday, September 03, 2004 at 06:55 PM • PermalinkComments ()

Calibrating Adobe Camera RAW

Following the less than perfect support for the E-1 in PhaseOne CaptureOne, I decided to go back to ACR, and, armed with Bruce Fraser's Real World Adobe Camera Raw, and his earlier Creative Pro article, I tried recalibration ACR for my E-1. I photographed a 24 patch Macbeth Color Checker in ambient light, downloaded the ProPhoto reference file from Bruce's website, and got going. The basic results were as shown here: acrcal.jpg If you can't read the image, the numbers are: Green Hue +8 Green Saturation +6 Blue Hue +20 Blue Saturation -15 Red Hue -20 Red Saturation +31 Be aware that you must first use the Adjust tab settings as Bruce describes to reach a neutral white balance. I'm not sure how "portable" these results are - I'd be interested to hear. Generally speaking the results are not bad at all - far better than my first attempts. I reached them after 3 iterations, and was in the ballpark from the 1st. The biggest problem is that the E-1 reds are very hot - this I believe is typical of all DSLRs, but the E-1's sensor definitely has a different kind of response to others. Not worse, not better, just different. We know it is different in design to, say, the Sony CCD used by Nikon and others, so no big surprise there. You have to basically try to achieve a good relative balance between the complementary colours on each main R/G/B patch - in other words, sort out the R/B balance for G, R/G for B, etc. I think you have to live with high R everywhere - bringing R down to the "correct" value badly distorts the overall balance. but letting it ride high doesn't seem to matter too much. Getting a good balance is the main thing - global corrections can be made, as ever, on an image by image basis in the Adjust tab. Two things are worth emphasising: first, before starting, play around with the calibration sliders to understand what they do. The thing to get in mind is that each colour slider affects the other two colours, not itself - hence Red Saturation affects Blue & Green together (increase Red and the other two go down) and Red Hue affects the balance of Blue & Green. As Bruce says, start off with getting Green Saturation right using the Adjust Saturation slider, then balance the Red & Blue in the Green patch using the Green H/S sliders, then move on to Blue, and finally Red. It works, once you get used to it. The other thing is that Bruce Fraser needs a technical editor. The two versions of his instructions (see above) are not totally consistent. It isn't so much that they are contradictory, more that they both tell 80% of the story. Together they make up the whole. A few other things let him down, for example he advises that there should be no specular highlights in the frame when you shoot the checker, for example a metal clip. Good advice, but what do we see in fig 3-25 ? Yep. a metal support with a specular highlight. I think that the book has been artificially extended to make it "long enough". There is far too much repetition. But there is also a lot of value, especially on the file browser. Possibly this is repeated in Real World Photoshop CS, I don't know, I haven't read it. But it should be.... Personally I would have preferred to see a more in depth (and far better laid out) section on calibration - for example a cut'n'paste from Creative Pro (!) and a bit less fluff. Maybe this would not have satisfied his editors - technical publishers seem to rate value by weight these days. In that case maybe a self-published, downloadable PDF would have been better (in the style of Digital Outback's guides). So what is the bottom line on RAW converters ? Adobe ACR - very deep potential, advanced highlight recovery, direct access to "gurus" (and the guy who wrote it) on Adobe forums, workflow advantages if you're using Photoshop CS anyway, free if you're using Photoshop anyway.... but a Macbeth color check is vital and is not cheap. And time is money, and it takes time to get it right. Nevertheless, you learn a lot of useful information going through the calibration process, which can be applied elsewhere. The Photoshop file browser is highly configurable, and basically is as good as (or better than) anything else apart from the lack of a histogram display. I'd expect it to improve... Capture One - very nice software, very good workflow, very good browser, a few quirks to get used to, but the pre-conversion crop & rotate, and the background processing are killer features. If you don't mind some issues with reds in extreme cases, have faith that they will fix these in the long run, don't mind being outside the Photoshop workflow, don't mind somewhat uneven technical support, and can tolerate the price, then this the winner at present. Olympus Studio - some nice concepts, excellent browsing and selection options, good downloader, camera control, "intelligent" lens distortion correction, but horrible, badly documented and limited RAW converter interface, and abysmal performance. On the other hand many people (including me) believe it gives the best absolute results. And only Olympus know exactly how their sensor works. It is also very prone to crashing on my system. I'm not sure about Olympus Viewer, but anyway who need that (at least) for firmware upgrades. In the long run we'll have to see what Olympus and Phase One come up with. But if they wait too long, ACR has a very good chance become the defacto standard.
Posted in Olympus E-System on Friday, September 03, 2004 at 09:14 AM • PermalinkComments ()

getting back into things

{categories limit="1"}in {category_name} {/categories}, Thursday, August 12, 2004

I really should write more here. I have a lot of thoughts, ideas, impressions that somehow are just too disorganised to write down. Showing my age, when I was a student (and after) I read a lot of Michael Morcock's Jerry Cornelius stories, which frequently revolved around entropy and general disintegration.

Seems familiar now.

ANYWAY, back to photography. I probably shouldn't write what I'm going to, because it isn't terribly constructive, and some people might take it the wrong way. But whatever, since nobody actually reads this stuff it doesn't matter.

Back in June / July, I participated in a photography workshop with a fairly well known leader. It was my first taste of "organised group photography" and probably my last. It was actually great fun from a social perspective - I got well away from the everyday slog, and met some great people, and enjoyed myself. But from a photography point of view it was a disaster. I'm not quite sure why, but basically almost all of my photos are not only dull but also technically flawed - frequently seriously so. I thought that it was because I'm still not as familiar with my Olympus E-1 as I thought I was, but then I looked back at previous stuff and found that, whilst still arguably dull, it was technically ok. So what went wrong ? Well partly I think photography is not a social/group activity. It's an individual thing. A workshop can be good if it focusses on tuition and discussion, but this one basically focussed on travel - a lot of travel. So the net effect was of 16 photographers hurtling around the landscape and stopping off every now and then to line up and take identical photos. Because I was so obsessed with trying to get an original take on things, I lost track of the basics, like making sure the tripod is correctly locked up, and I'm using the appropriate settings.

All in all in has given my self-confidence a big kick (not that it was so high to start with) and has actually ended up with me feeling really fed up with photography - which is a problem because it has been my only creative outlet for some time.

Probably I was just naive to think that working with a "name" photographer would be rewarding: in fact, and inevitably, it just amplifies and highlights one's own failings.

Posted in on Thursday, August 12, 2004 at 03:34 PM • PermalinkComments ()

Capture One

{categories limit="1"}in {category_name} {/categories}, Wednesday, August 04, 2004
Well it's finally here: PhaseOne's Capture One SE with Olympus E-1 support (or C1SE for short). I've been watching PhaseOne's web site like a hawk, waiting for this release, which feels long overdue. C1SE is reputed to be the best raw developer on the market, and with the shortcomings of Olympus Studio and of Adobe Camera Raw, I was hoping it would solve the raw workflow problem. I've been using it extensively over the last week - here are my first impressions. c1se.jpg First of all, C1SE is more than a raw developer. It claims to be a full "workflow" tool, and it pretty much lives up to this. When you open a folder of E-1 raw files in C1SE (or more accurately, create a session folder and dump files into the Capture sub-folder), it immediately starts to generate thumbnails, and does so at a velocity which should embarass both Olympus and Adobe. Once it has done this, double-clicking on a thumbnail opens up the file preview in the main part of the application window. From here, you proceed through 4 steps - white balance / colour balance adjustment, image adjustment, focus check and process. All adjustments work in real time and are highly responsive. In C1SE you work on a preview - as in Adobe Camera RAW, but not, I suspect, in Olympus Studio. Two tools that deserve special mention are the arbitrary rotate - which is brilliantly implemented - and the crop tool. Applying these as part of the raw conversion is a real plus. The Process tool allows you to set scaling and image size (a bit confusing at first), as well as output format. You then add the image to the Process queue - and here is the real tour-de-force - C1SE processes the output in the background, leaving you to move on to the next photo. The RAW conversion is much slower than in either of the other two products, but it doesn't matter, because it happens in the background. In C1SE you can queue up to 100 files for processing. There are many other nice features, but the bottom line is of course the results. Well, in general they're very good. C1SE produces nice, slighly warm output at default settings, without any of the lurid colour shifts that plague Camera RAW. But it does have a problem with bright reds, sometimes producing the same weird mosaic effect that Camera RAW did prior to v2.2. This can be alleviated with the slightly mysterious "noise" slider in the Focus Tool. So, apart from this, what are the downsides ? Well first the folder structure that C1SE imposes is a bit annoying. I would rather that it let me decide how to organise my work. In the short term it is ok, but in the longer term the lack of a standard interface to the operating system file browser could become cumbersome. Second, the documentation is a little eccentric, and user support appears, from browsing the support forums, to be rather poor. Third, the support for out-of-camera EXIF data is patchy (but at least it doesn't get thrown away, like it does in Olympus Studio 16bit TIFF). But weigh that against the ease of use, remarkable responsiveness, 100% reliability and excellent tools... C1SE is a little expensive at $299. There is the cheaper C1LE at $99, but that misses some of the unique features in SE. I just received my copy of Bruce Fraser's "Real World Camera Raw with Adobe Photoshop", and I'll be reading that in depth to see if I can tame ACR before I decided to buy C1SE. You can download a 15 day fully functional trial from phaseone's]http://www.c1dslr.com">phaseone's[/url] web site
Posted in Olympus E-System on Wednesday, August 04, 2004 at 04:09 PM • PermalinkComments ()
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