| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Camera RAW & JPEG 2000 Review by: Gary Coyne Provides: Ability to open and correct images in
the RAW format within Photoshop 7.0.1, JPEG 2000 provides
excellent lossy compression and very good lossless
compression. With this new plugin by Adobe, users of Photoshop and Photoshop Elements now have access to the original digital data from their camera. This one plugin is likely to sell more new digital cameras to those who already own digital cameras than any marketing dream could possibly hope. Imagine the limitations if you were trying to get high quality copies of your wedding photos and the only images you had to work with were those that came from the one hour photo in the shopping mall down the street. That's not intended to be a slap at any given one-hour camera store; I'm sure they do wonderful work. But realistically, copies from these images can not compare to any print made from the original negatives. If you consider that all the JPEG images you get from your digital camera have been "worked over" by the software in the camera, the analogy of the one-hour photo store starts to make more sense. What do I mean worked over? If you save your image as a JPEG, your camera adjusts for white balance, does some sharpening, does JPEG compression, perhaps a few other adjustments, and then the image is saved on the memory card. Most of these adjustments you have limited, or no control over. While the TIFF image format is not lossy (like the JPEG format), it still has had the same processing of white balance, sharpening, and whatever other corrections have been made "in the camera." [Piece of trivia: Did you know that one of the manufacturer's deciding factors in how large a memory card to place in the camera is the minimum size necessary to save one TIFF file at the largest resolution?] RAW files are, by definition, just the raw data, and are considerably smaller than TIFF files (but much larger than JPEGs). Probably the biggest bugger with them is not only is the format unique to each camera company, but sometimes to different models of cameras from the same manufacturer. Leave it to someone like Thomas Knoll to figure this out. After all, he's the guy who originally authored Photoshop. Sadly, at this point, not all Cameras' RAW data can be read by Adobe's Camera Raw, but if you find your camera listed below, ready on. Otherwise, read on with envy.
Because of the proprietary nature of the RAW formats, some manufacturers supply software for free to read the format, others provide software at some cost. However, as most people who are wanting to use the RAW format are likely to want to do some work in Photoshop, the extra software only added cumbersome steps to the correction process. Now, with the new Photoshop plugin, users can do everything within Photoshop.
One can open a RAW photo via either the File -> Open (Command-o) or the File Browser where the image shows up alongside other images. Regrettably, you can only open one RAW image at a time. An image that is rotated in the File Browser will remain rotated in the RAW work area. Alternatively you can rotate images by clicking on the rotation buttons seen below the lower right corner of the image region. Probably the most powerful option with Camera RAW is its white balance control. In your camera, you probably have a WB setting for neon, tungsten, sun, cloudy, and auto. What this does is "flavor" the image with a color cast to compensate for the colors (or lack thereof) contained in your light source. As you know, light is composed of the full spectrum of colors and the light from a neon light provides a different range of colors than a tungsten light or sunlight. That's why you might put on some clothes in the bedroom, go outside and wonder why you thought you were wearing a good color combination. The white balance algorithms in Camera RAW are not only better than those in your camera, but you can fine-tune them to your hearts content. As seen in the upper right corner, once a RAW picture is open, there is a collection of preset options to select from. Starting from the default "As Shot," one can also select "Auto," "Daylight," "Cloudy," "Shade," "Tungsten," "Fluorescent," "Flash," and "Custom." Once you select an appropriate option, you can fine-tune the image to your satisfaction. By sliding the Temperature slider, one can make the image more blue (colder) (to the left) or more red (hotter) (to the right). [The correction was exaggerated here for display purposes.]
Aside from sliding the temperature or selecting one of the pre-set color balance options, one can also set the temperature by manually typing in any desired temperature (if known), or by using the eyedropper (upper left corner) and clicking on a neutral part of the image. Also note the histogram in the image above. This can be turned on or off by checking a check box and can be easily moved around the image region by mouse-dragging. The histogram provides a live update of the separate RGB channels. Thus, one can easily see balance points in the image and can use the main image and the histogram for double-confirmation of any setting. If any further color correction is desired, one can adjust the Tint slider to provide more green (left) or magenta (right) to the image. Once you have your colors set, you have four sliders for correcting how light or dark your image needs to be. These are "Exposure" (settings are in f-stops), Shadows, Brightness, and Contrast. To complete the Hue/Saturation/Lightness set of options, the Saturation slider is provided. Lastly you have (1) the Sharpness slider which is probably irrelevant if you plan to do any sharpening later in Photoshop as you are better off to do this with "Unsharp Mask..." and (2) the Smoothness slider to remove digital camera noise and provide the type of control that you can't get when this is done "in the camera." That is, you can apply just as much as necessary and no more. The Moiré Filter does an excellent job of removing the Moiré patterns seen when taking (for example) close-ups of fabrics on an angle. And lastly-lastly, one can save the image into Photoshop as either an 8-bit or 16-bit image; save it in one of four color spaces (Adobe RGB, ColorMatchRGB, PorPhoto RGB, and sRGB); and the resolution (from the default 240 to whatever you want). You can also change the size of the image, but I don't fully understand the dynamics of this feature. I had one image that was originally 2272 x 1704. I was given two options: sample down to 1365 x 1024 or sample up to 3072 x 2304. On another image that was 2560 x 1920, I had two sample down options (2048 x 1536 and 1365 x 1024) and one sample up option (3072 x 2304). The algorithm Camera RAW uses to sample up seems good, but admittedly, I saw essentially no differences between a photo sampled up within Camera RAW (on the left) and on the right I sampled up (to the same resolution) within Photoshop (on the right). The image is magnified 400%.
Once you have completed any corrections to the image in Camera RAW, clicking the OK button brings the image into Photoshop. Now, here's the extra good news: If you select "Save" at this point you can only do a "Save as..." Your original photo cannot be changed--even by accident. Also included with Camera RAW is JPEG2000, a long-time emerging new image format intended to eventually replace JPEG.
Adobe's JPEG 2000 actually has two different options for saving an image, the stated JPEG 2000 (jp2) and an extended JPEG 2000 (jpf) which has more options available. Unfortunately one cannot access JPEG 2000 from the "Save for Web..." option, it can only be accessed via the "Save as..." selection in the File menu as seen in the small image above. Once selected, one has a special window to manipulate the image for saving.
What you don't have in this window is the ability to easily compare the end result of one saving option to another. As such one is limited to simply trying a variety of options and then later comparing them to see what happened. There are three main sections to saving a JPEG 2000 image. The most important one is the region on the top right called JPF Settings. There, one can either set a file size and after setting the various options such as Lossless or not and whether to include MetaData, Color Settings, Transparency, and JP2 compatibility you find out what the quality will be or you can set the Quality (and then set the settings, and find out what the file size will be.) The compression can be greater than standard JPEG but without the JPEG artifacts and as such, the image quality is much better. Below on the left you see part of an image (600 x 797 pixels) at 10% quality (54k) and on the right is 90% quality (451k). In use, setting up your save is like a teeter-totter--go for size of image and see what the quality is or visa versa. As seen below, that 10% image is pretty good. If you select the lossless option, the size balloons up to 648k (with Lossless format there is no option for varying the quality). The same image saved in Photoshop format was 1.3 MB.
Sadly, I was unable to place an image in a page in Adobe GoLive and I was unable to open an image in either MSIE or Safari. Adobe does let you know that you do need a special plugin for a JPEG 2000 image to be seen on the web but Adobe failed to include such a web plugin and an extended search on the web failed to find any such plugin. As such, it seems that JPEG 2000 is a great technology that is waiting to happen, and is likely to wait a bit longer. Adobe's JPEG 2000 plugin seems like one of the better plugins available. Despite my inability to find plugins for browsers, I did find a variety of other plugins for Photoshop to create the JPEG format and none of them seem as nice as this one. But it seems that the only thing you can do with it is to send a JPEG 2000 image to someone else with a JPEG 20000 plugin for Photoshop. There is one annoying workflow aspect of this plugin: after you select the JPEG 2000 option from the "Save as..." (File) menu, you first provide the name and where it's going to be saved, and THEN deal with the saving options. This backwards approach is not common and there's a good reason for that. My last word is that despite JPEG 2000, Camera RAW is a wonderful plugin for professional photographers or those who want to do professional level work. If you do not have one of the cameras listed above, and are looking for a new camera, you should consider one of the above because they provide the RAW format. Because of this new plugin, camera manufacturers are much more likely to produce new cameras with the RAW format. But keep in mind that Camera RAW is essentially assured to be part of Photoshop 8 which will probably be released in 12-18 months. (Please note, I'm guessing on that release, so don't hold me to that.) Whether you purchase Camera RAW now or wait to obtain it as part of a Photoshop upgrade is your call. If you have a camera that produces the RAW format now, it's an easier call to make. ![]()
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||