![]() ![]() I found values of 0.8 to 1.2 are good for contrast if you want lighten or darken specific areas. Remove the space and surround the argument by quotes. If you want to go negative, I found that specifying the option like -c"-1" will give you minus 1. ![]() Negative numbers for contrast invert the image. Simply and quickly add labels to share the details of who you saw, what you ate, where you went. HISTORY: In the early 1980s, while developing the graphics technology for the first Macintosh, Bill. The visual effect produced by this technique creates rich, velvety tones, and is higher-quality than the Diffusion Dither method offered by Photoshop. ![]() Add pointers, labels, descriptions, and commentary to your photos. HyperDither uses an elegant color reduction (dithering) routine to turn color or grayscale images into black and white or grayscales. You Have to Be Able to See the Screen: Buying Prescription Specs Online Charles W Moore, Book Value, Low End Mac - 2008.07. In fact, it only does one thing it dithers images. Numbers larger than 1 increase sharpness/contrast, numbers below 1 reduce it. HyperDither BEST OF ABOUT Tell the whole story. HyperDither falls in the second category, and compared to image editing powerhouses like Photoshop and even Photoshop Elements, its feature-set is incredibly sparse. If image is scaled from the resized pre-dither image if the -r option was specified.įor contrast and sharpness, 1 is default and does not need to be specified. Makes output image twice as large as the pre-dither image. -2: double post-dither image using nearest neighbors.Makes the image smaller only, pre-dithering. HyperDither uses an elegant color reduction (dithering) routine to turn color or grayscale images into black and white or grayscales. -r: resize pre-dither image on longest dimension.-s: boost sharpness by specified amount (in terms of pillow's ImageEnhancers factor: 1 is no change).-c: boost contrast by specified amount (in terms of pillow's ImageEnhancers factor: 1 is no change).-b: start at bottom left instead of top left with the dithering.Must be accepted by PILLOW or it will throw an exception. Otherwise the output is encoded as an RGB file. HyperScan, and hence the most-excellent Atkinson dithering routine, has been unavailable for many, many years - but not forgotten! I was able to email Bill Atkinson in January, 2003 and inquire about the details of the algorithm he was kind enough to respond with a brief write up of the routine - 15 minutes later I had it up and running. The dither matrix was implemented as an option in Apple's long-lost HyperScan software (A HyperCard stack with some XCMDs/XFCNs) that would connect an early Mac to a flatbed scanner. The dithering produced by this routine was much higher quality than the now-a-days ubiquitous Floyd-Steinberg or "Error-diffusion" filter (used by QuickTime, PhotoShop). Years ago, during the development of the first Mac, Bill Atkinson (of HyperCard, QuickDraw, MacPaint & now nature photography fame) discovered a very elegant dithering filter to convert greyscale image data to the 1 bit black & white Mac video display. Specifically, HyperDither implements the ?Atkinson? dithering filter. HyperDither is an OS X image processing utility that converts color or grayscale images to 1 bit black & white using a sophisticated dithering routine. HyperDither is a nice, free program only available for Mac, being part of the category Design & Photography with subcategory Image Retouching & Optimization. ![]()
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