Timeline for Pseudo high-bit grayscale - does this idea already exist?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 4, 2020 at 15:46 | comment | added | Tetsujin | Sheesh… that was a runaround ;) I can see it when I know where to look, but I have to expand it to actually be able to read it. I can't read it at the size in the answer, only a vague hint of where it is. At least I know my monitor calibration is at least that good :) | |
| Jan 4, 2020 at 15:02 | comment | added | xenoid | @alephzero Displays have changed quite a bit since. I remember seeing top of range displays (around $400K) in the mid eighties and they would do 1024x1024 with 32K colors. No speaking of a polemic a few years ago because some Apple screens would only do 10-bit display. | |
| Jan 4, 2020 at 14:52 | comment | added | alephzero | @xenoid I did some experiments a long time ago (probably in the 1980s) and concluded that 128 levels of intensity showed clearly visible Mach bands, but 256 did not - at least for typical displays and "untrained" observers at that time. | |
| Jan 4, 2020 at 13:20 | comment | added | Edgar Bonet | The digital representation is also non linear. Typically sRGB, with a gamma close to 2.2. Maybe not as good as a logarithm, but it does help prevent banding in the dark regions. | |
| Jan 3, 2020 at 22:13 | comment | added | LightBender | @xenoid true, I probably oversimplified, human vision is logarithmic, while digital representations are linear, so the lower the brightness value, the easier we can tell the difference because it's being displayed as absolute brightness. This is one of the main reasons printed gradients look so smooth as half-toning is also non-linear. Very large neighboring dark regions do indeed produce noticeable banding, but simple dithering near the transition is the go-to method, hence why the banding is more noticeable when the image is scaled. | |
| Jan 3, 2020 at 21:26 | comment | added | xenoid | In fact you can perceive the difference in the right conditions, like for instance a very slow gradient (which would cause visible banding with just 8 bits). | |
| Jan 3, 2020 at 20:18 | history | answered | LightBender | CC BY-SA 4.0 |