9/5/2023 0 Comments Rawdigger reviewThis is the visible spectrum image, obtained from the Raw file shot with my Canon 40D camera, so no IR light has reached the sensors. Let's have a look at the first Test Case file. That is, there are twice as many green sensors as there are red or blue ones. Just to complicate matters, although this turns out to be important for IR work, there are two green channels associated with Canon camera sensors, so that they are referred to as RGBG or RGBG2. With colour images, the three primary colours are red (R), green (G) and blue (B), and these all have their own data in the Raw file, and so are often displayed as three different histograms, and referred to as the colour channels. Histograms are an essential tool in serious photography as they provide, inter alia, information about exposure (including clipping), distribution of brightness across the image, and colour balance. A histogram displays how many pixels have each value of brightness the value of the brightness being along the X-axis, and the corresponding number of pixels being displayed as bars along the Y-axis. What is a histogram? The photographic data comprises lots of points (pixels) that have different brightness (lightness, luminosity) values - some black, some dark, some mid-tone, some highlights and so on. Second, in order to study these data we need to make use of histograms. Raw files allow much greater creative control and flexibility for processing than the other common image presentation file, the JPG or JPEG file. We are concerned with that original Raw data. That information is stored as a file that contains the data itself, along with any other processing information that may or may not be used at a later stage. A Raw file is the photographic information captured by the sensors in the camera when exposure takes place. First, what is a Raw file? Most serious photographers nowadays work in Raw Mode, that is they capture their images as Raw files that, subsequently, are processed by the camera's own firmware and/or on a computer using the equipment manufacturer's software (eg DPP) and/or third party software such as Lightroom. If the reader is new to this sort of thing two preliminary matters need addressed. (There is a 30 day free and fully functional trial.) Nevertheless, some very interesting information comes out of the application. RawDigger is a microscope of sorts that lets you drill down into raw data both on Mac OS X and Windows." I have to say that this is not the simplest of systems to use, and my understanding is still rudimentary. " RawDigger is a tool allowing (you) to view, study, and analyze pure raw data as recorded by digital photo and certain video cameras. The one application with which many may not be acquainted is RawDigger => As the home page to the site says: Most people will be familiar with Lightroom and Photoshop Elements those using Canon cameras will be conversant with Canon's DPP software those using other camera makes will have their own manufacturer's software which they will know and use. In addition, I have re-examined several of my previous IR photographs and RAW files to see if the results from these Test Cases are replicated. I have analysed the images and RAW files using, principally, Lightroom, and RawDigger. To study this, I have made some Test Case RAW files and photographs of the same subject using my Full Spectrum (FS) converted Canon 40D camera. Andrew Lugal mentioned how he felt that contrast was a bit of a problem in his IR work my own delvings into what I call the Okavanga Effect have unearthed oddities about exposures in IR photography and general perusal of how IR photographs are rendered by different software such as Adobe's Lightroom (LR), Photoshop Elements (PE), Canon's Digital Photo Professional (DPP) and RawDigger - software designed to study RAW files directly - has shown how variable the interpretation of RAW files can be. However, writing such Journals summarises for me what I have been doing, helps clarify in my mind some issues, and may provide other like-minded photographers with details that may have escaped their attention.Ī number of recent matters have caused me to look into the nature of RAW files in photography, and how their makeup influences infrared (IR) photography. This is, primarily, a technical monograph, and may not be of interest to the general reader.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |