![]() By processing with 16-bit files, you maintain all the information necessary to ensure quality in all portions of the histogram. The more you adjust, the greater the risk of having gaps in your tonal range that become visible. Whenever you make any tonal adjustments you stretch or compress different parts of the histogram. If all you do is prepare images for the Web then 8-bits is plenty of information but you’ll want to process in 16-bits for just about any other scenario. If you convert the file to an 8-bit file, you’re throwing away a lot of that data. You shoot RAW to take advantage of all the additional data collected by camera. If my lab prints my images using 8-bit printers, why mess with 16-bit files? That’s a good question and not one that is intuitively obvious. These are converted to 16-bit files by programs like Lightroom, Adobe Camera Raw or the proprietary RAW file converters. The digital processor inside a DSLR will generate RAW file data in either 10-bit, 12-bits or 14-bits. If you instead shoot RAW files, the image data is saved in a format greater than 8-bits, although they are not all true 16-bit files. The JPG file format does not support 16-bit. If you shoot JPG images, they will be saved as 8-bit files. Any less than that and we would notice bands of different tones, a phenomenon called posterization. With 256 tones from black, to white, we perceive continuous tones. ![]() (You knew that math from school would come in handy.) The range of tonal values in an 8-bit image begin at black with all bits being “0”, all the way to white with all bits being “1” - 256 different shades from end to end. The total number of unique combinations for 8-bits is 256. ![]() Remember that each bit is either + or -, represented by either “0” or “1”. 8-bits of data are used to define the tone of each pixel in an image. Let’s take a black and white image first. For photographs we need to remember that images are made up from a collection of pixels. To produce the letter “A”, for example, the computer uses 8-bits of data. Deep inside your computer or camera that bit is really just a positive or negative electrical charge.įor normal data files, 8-bits are used to represent a single letter, number or symbol. And image files are simply data files that contain all the information necessary for your computer to generate an image. Yes, you have optics to focus the images but in it’s core your trusty Digital SLR is a powerful, albeit small, computer system. "5/6/5 has always been how Windows has handled 16-bit video modes (at least, in my memory) so I'd be inclined to grab a Photoshop filter that dithers to 5/6/5 format and tweak from there.Your camera is a very powerful computer. I cross-posted this question on Server Fault and got the following information: I'd rather use GIMP since it's free but I can borrow a computer with Photoshop in it if I have to. Is there any way to downsample the image to a 16-bit color palette and use dithering to reduce the color banding in the image? The problem is that the RDP session is limited to 16-bit color, and it creates a visible and annoying vignette pattern in the image which looks unprofessional. ![]() I am setting up a terminal server farm where the desktop shows our corporate branded background image. That being said, I thought this would be the best forum to ask this question: NOTE: I'm a systems administrator, not a graphic designer, so I'm a total n00b when it comes to image manipulation. ![]()
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