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One common application of dithering is to more accurately display graphics containing a greater range of colors than the display hardware is capable of showing. For example, dithering might be used in order to display a photographic image containing [[24-bit color|millions of colors]] on video hardware that is only capable of showing 256 colors at a time. The 256 available colors would be used to generate a dithered approximation of the original image. Without dithering, the colors in the original image would be quantized to the closest available color, resulting in a displayed image that is a poor representation of the original. |
One common application of dithering is to more accurately display graphics containing a greater range of colors than the display hardware is capable of showing. For example, dithering might be used in order to display a photographic image containing [[24-bit color|millions of colors]] on video hardware that is only capable of showing 256 colors at a time. The 256 available colors would be used to generate a dithered approximation of the original image. Without dithering, the colors in the original image would be quantized to the closest available color, resulting in a displayed image that is a poor representation of the original. |
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The very earliest uses were to reduce images to 1-bit black and white. This may have been done for printing even earlier than for bit-mapped video graphics. It was common for making images to display on 1-bit video displays for X and Apollo and similar Unix workstations. The dithering was usually pre-computed and only the dithered image was stored; computation and memory were far too limited to compute it |
The very earliest uses were to reduce images to 1-bit black and white. This may have been done for printing even earlier than for bit-mapped video graphics. It was common for making images to display on 1-bit video displays for X and Apollo and similar Unix workstations. The dithering was usually pre-computed and only the dithered image was stored; computation and memory were far too limited to compute it "live". |
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An example home computer users may have seen was emulation of lower resolution [[Color Graphics Adapter|CGA]] 4 color graphics on higher resolution monochrome [[Hercules Graphics Card|Hercules graphics cards]], with the colors being translated to ordered dither patterns.<ref>{{Cite web |title=ibm pc - How do CGA emulators for Hercules graphics work? |url=https://retrocomputing.stackexchange.com/questions/6963/how-do-cga-emulators-for-hercules-graphics-work |access-date=2021-02-07 |website=Retrocomputing Stack Exchange}}</ref><ref>{{Cite web |title=DOS Days - CGA Simulators for Hercules Cards |url=https://www.dosdays.co.uk/topics/cga_simulators_for_hercules.php |access-date=2022-12-03 |website=www.dosdays.co.uk}}</ref><ref>{{Cite web |title=The Programmer's Corner » SIMCGA41.ZIP » Display Utilities |url=https://www.pcorner.com/list/GRAPHUTI/SIMCGA41.ZIP/INFO/ |access-date=2022-12-03 |website=www.pcorner.com}}</ref> |
An example home computer users may have seen was emulation of lower resolution [[Color Graphics Adapter|CGA]] 4 color graphics on higher resolution monochrome [[Hercules Graphics Card|Hercules graphics cards]], with the colors being translated to ordered dither patterns.<ref>{{Cite web |title=ibm pc - How do CGA emulators for Hercules graphics work? |url=https://retrocomputing.stackexchange.com/questions/6963/how-do-cga-emulators-for-hercules-graphics-work |access-date=2021-02-07 |website=Retrocomputing Stack Exchange}}</ref><ref>{{Cite web |title=DOS Days - CGA Simulators for Hercules Cards |url=https://www.dosdays.co.uk/topics/cga_simulators_for_hercules.php |access-date=2022-12-03 |website=www.dosdays.co.uk}}</ref><ref>{{Cite web |title=The Programmer's Corner » SIMCGA41.ZIP » Display Utilities |url=https://www.pcorner.com/list/GRAPHUTI/SIMCGA41.ZIP/INFO/ |access-date=2022-12-03 |website=www.pcorner.com}}</ref> |
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|archive-date = 27 September 2007 |
|archive-date = 27 September 2007 |
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|url-status = dead |
|url-status = dead |
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}} ''Note: this article contains a minor mistake: |
}} ''Note: this article contains a minor mistake: “(To fully reproduce our 256-level image, we would need to use an'' |
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'''8x8''' ''pattern.) |
'''8x8''' ''pattern.)” The bold part should read "16x16".''</ref> |
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Dithering methods include: |
Dithering methods include: |
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