photoblogography - Just some stuff about photography

Pixel mapping

in Olympus E-System , Monday, February 07, 2005
So, about 1 year on from buying my E-1, I suddenly noticed...... ARGHH! a STUCK RED PIXEL!!! Rabadan_050206_23_001.jpg
the stuck pixel The world is ending! I need a new camera! I have to search the web for horror stories about hot pixels!!! And then, I remembered: a quick trip to the camera settings menu, select "Pixel Mapping", press ok, et voila, no more red pixel. Apparently Nikon & Canon owners, and quite possibly Pentax too (but maybe not Minolta) have to send their cameras to be serviced to accomplish this task. :-p
Posted in Olympus E-System on Monday, February 07, 2005 at 06:11 AM • PermalinkComments ()

Silverfast DC-Pro for E-1 RAW

Lasersoft Imaging is a company with an impressive pedigree in digital imaging. For years, their Silverfast software has been the gold standard in scanning software, supporting a huge range of scanners with a sometimes bewildering variety of options and configurations. From low end consumer devices to high end drum scanners, Silverfast has it covered. Many hardware providers have given up on their software, and either bundle just Silverfast or provide alongside a token face-saving effort of their own. Silverfast is extremely powerful and with some experience can be used to extract the best from scanners, especially film scanners. However, it isn't exactly a usability paragon (although it is better than its only serious rival, the cranky and bug-ridden Vuescan). Since Silverfast is basically a generic image enhancement application layered on top of a device driver, it didn't take a huge leap of imagination to work out that the device driver could be a RAW decoder. And hence a new range of Siverfast variants, the DC range aimed at digital cameras. As a long-time Silverfast Ai user, since Lasersoft claim to support the E-1, I've been tempted to try it for some time. There are 4 variants to Silverfast DC - DC-SE, DC-VLT, DC Pro, and DC Pro Studio. DC SE is the basic version, bundled with some cameras (e.g Leica Digilux); DC-VLT includes the VLT (Virtual Light Table), a RAW engine limited to 24 bit output, and the full, sometimes overwhelming set of image adjustment utilities. DC Pro is the same (also includes VLT) but supports 48 bit output. DC Pro Studio adds some extra features to DC Pro, for example the clone tool, which is I think unique in RAW converters, allowing dust and hot pixels to be removed at the conversion stage. Confused ? Well we've hardly started on Lasersoft's Byzantine product segmentation! Anyway, the main thing to remember is that we have effectively two loosely coupled applications. VLT is essentially for selecting, organising and managing digital images, DC is for processing them, although the boundaries are a bit blurred. The functionality of the VLT depends to some extent on the version. You switch between the two but you cannot have both on screen at the same time. The reason for this is, I suspect, a legacy issue, as the DC series are really a bolt-on to the Ai scanner series. However, the VLT isn't bad at all, once you get used to it. It is fast and responsive, highly customisable, and in my opinion better than Photoshop's File Browser. You can use VLT to select photos from the file system and sort them into any number virtual albums, you can queue images for background processing, and a host of other things, but it must be said that certain features, such as batch processing, are as clear as mud. In many ways VLT combines the best of Olympus, PhaseOne and Adobe's features, but one thing missing is the ability to compare several previews at once. It does avoid imposing its own idea of the world, unlike C1 with its annoying sessions concept. The only drawback is, as I said before, the fact that you have to switch to another application to apply corrections. VLT has also a very complete EXIF browser, one of the best I've seen. vlt.jpg
Silverfast's Virtual Light Table Unfortunately it is when you switch to the (confusingly named) "Silverfast" application that the early promise starts to fade. The initial images presented look quite strange, apparently because Silverfast doesn't use the in-camera white balance. Bringing up the same image simultaneously in Olympus Studio 1.2, C1 SE v3.6 and Silverfast gives almost identical results in the first two, and a completely different rendition in Silverfast. Silverfast does seem to bring out better shadow detail than the other two, but at the expense of a bizarre colour balance which is all but irretrievable, even with the fast power of the image correction tools on offer. DC-Pro, unlike DC-VLT, appears to use the Olympus RAW internal thumbnails (with DC-VLT, thumbnails are generated by VLT, like in C1). Ironically, when you first open an image in Silverfast DC Pro, a very nice looking preview - generated from the thumbnail, I assume - flashes up, only to be overwritten by the above-mentioned oddity. dcpro.jpg
The Silverfast image adjustment application A core feature of the generic Silverfast range is color managed workflow. Silverfast allows you to - indeed encourages you to - calibrate your scanner against a supplied target. DC-Pro also includes camera calibration features, and a supplied target. This really would be a winning feature, except for the fact that even Lasersoft themselves point out that camera calibration is so dependent on external factors that it is of little use except in controlled shooting conditions. It is an interesting feature to have, but it may be at the root of the problem which Silverfast has with the E-1: the interpretation of the RAW data is based on camera profiling, and it appears that with the E-1 at least, Lasersoft have got this seriously wrong. The adjustment tools do allow a reasonable rescue operation to be mounted, but this requires first going to another application to read the in-camera white balance, and to generate a reference image to try to match. All a bit pointless really. For those unfamiliar with the scanner versions, Silverfast also includes some strange-seeming options, such as a Descreen filter. Very useful for scanning printed paper, but not much called for in RAW processing. In the same menu as this unlikely option are the sharpening (USM) tools, and another hangover from film scanning, the GANE grain reduction tool (which can't be applied at the same time as USM!). This, at least, can be used for noise reduction - except that there is a noise reduction slider in the Picture Settings widget (which only comes with DC Pro Studio, as far as I know - even more confused ?). All this needs a serious tidying up operation. DC-Pro Studio adds yet more mayhem, with a more flexible sharpening tool, the above mentioned clone tool (which actually includes a texture matching option putting it on a par with Photoshop's healing brush), and the AACO Auto Adaptive Contrast Optimisation tool, "for the correction of dark, high-contrast areas of the image while preserving the details in the highlights". AACO is a newcomer to Silverfast's vast acronym collection. It seems quite useful, but the early version in Ai Studio was buggy. A final point is that it isn't quite so clear where in the processing these tools are applied. Mac and PC trial versions of all DC Pro variants are available from Lasersoft. The trial is fully functional but imposes a watermark on final output. It does allow one very positive point to be seen - apparently Lasersoft have managed to avoid the dreaded "tetris effect" in bright reds which plagued earlier versions of C1 and others. dcpro2.jpg
300% zoom in Photoshop of Silverfast converted RAW - no Tetris! Silverfast is especially interesting because it offers the promise of a one-stop, integrated solution for both digital and film-sourced raw image processing. It is competitively priced compared to alternatives such as C1, and unlike any other rival it matches and sometimes goes beyond Olympus Studio's organising features. The Silverfast correction tools are really all-encompassing, and in some areas, for example the ability to simultaneously adjust individual RGB or CMY channels, way ahead of Photoshop. A free rotate tool similar to C1's would really complete the package. However the transition from scan correction to RAW adjustment software has been handled clumsily, and needs a serios rethink. There are far too many ambiguous, redundant or plain irrelevant featires. But for Olympus E-1 owners, at present colour fidelity is a showstopper. Lasersoft have stated on the Silverfast forum that fixing the GUI is a priority. If they can fix a few other things, improve E-1 profiling, and try to separate out specific film scanning features from specific digital RAW adjustment features, then they may still be well worth watching.
Posted in Olympus E-System on Monday, February 07, 2005 at 05:37 AM • PermalinkComments (1)

Coot of the day

{categories limit="1"}in {category_name} {/categories}, Monday, January 17, 2005
Another day, another batch of lake bird photos. Again I used the 50-200mm lens, again with the teleconverter. This time I had little trouble with AF in C-Mode. Today's photo is a close-up of a coot. Trying to optimise the exposure, I used center weighted averaging centered on the head. I also tried using spot metering with AE Lock, which also gave usable results. LagoLugano_050117_59_001.jpg
Posted in Olympus E-System on Monday, January 17, 2005 at 07:57 PM • PermalinkComments ()

Not so boring ?

{categories limit="1"}in {category_name} {/categories}, Saturday, January 15, 2005
Today's "boring bird" is a greater crested grebe, caught in unusual light. This time I used the 1.4 teleconverter, and found that auto focus was much worse. In some circumstances, for example standing on a floating, but almost still, pontoon, trying to focus on a also floating, but practically stationary bird, in C-mode the AF was a complete failure. In S (single) mode it was better, but clearly the reduced light resulting from adding the teleconverter seriously degrades AF performance. grebe2.jpg NOTE - due to the activities of the antisocial, amoral morons who flood blogs with comment spam, I've finally got fed up and been forced to deny unregistered comments. You can still comment here, but first you need to register, once only, with Typekey. I hope to make this more transparent when I have time.
Posted in Olympus E-System on Saturday, January 15, 2005 at 01:23 PM • PermalinkComments ()

Making the mundane interesting

{categories limit="1"}in {category_name} {/categories}, Thursday, January 13, 2005
In the last couple of days I've shot around 280 photos of common (mallard) ducks and associated waterbirds. These are not what you'd call challenging wildlife, simply pretty placid birds on a tranquil lake - say one step up from a park, but not a very big step. However, it occurred to me that perhaps it would actually be a challenge to see if I could take some interesting photos of ducks, and at the same time practice and hopefully improve my wildlife photography skills. The lake is Lake Lugano, and recently I have had about 30 minutes to spare on the lakeside every day between 1pm and 1:30. So the sun is up, and bright, which adds to the fun. Apart from ducks, which are actually show very interesting behaviour if you watch them for a while, there are coots - VERY challenging photographically, being coal black and snow white, and what I think are Great Crested Grebes, which are attractive and fun to watch, although a bit more skittish and elusive than the others. There are also lots of swans and gulls, neither of which interest me much at the moment. I've been using the 50-200mm lens. Initially I used it without the extended grip, but now I've added that, and taken off the collar to save weight - all this is handheld. Having time to take time to work with it, I've been much happier with the auto focus, particularly in C-mode. I'd still like wider focus points, but I'm getting on much better with it. Here is a photo of a Coot - in bright sunlight, it is impossible to capture detail in both the bird's beak and all the body. Exposure is a bit of a guessing game. After some experimenting, I settled on using centre-weighted metering, with a few 1/3 steps of negative compensation, metering on the head (including some of the white area). This seems to work ok - although I'm sure there are other approaches. ESP metering doesn't really work in such a case - the highlights are totally blown. LagoLugano_050114_52_001.jpg Next time out I'll add the 1.4x converter. But what I'm really after is, as I said at the beginning, some really different photos of a common subject - ducks.
Posted in Olympus E-System on Thursday, January 13, 2005 at 07:25 PM • PermalinkComments ()
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