|
|
Atari demoscene BBS
| Re: Multi Palette File format |
|---|
|
Posted by: Cyg
|
Oct,12.2012-13:12
|
I just watch the screen which pretends to display 2 million colors in the "True is a lie" demo.
They are using 2 switching screens and a pixel dithering.
The estimated 2M colors is made of 127 level of colors :
- 16 levels from the STE palette
- x2 by switching to screen (27971 colors)
- x4 by using different dithering horizontal vectors
Their dithering matrix is 4 pixel large, it works fine on large horizontal color transition, but I am not sure it would do the trick on a real picture because it would make changes too far from the original pixel.
After testing various way of doing a dithering, I believe that a good dithering is a pre-dithering on the original picture, not on the final result, except when you have large and smooth color transition, then a floyd steinberg dithering is appreciable.
Moreover, using pre-dither pictures can improve the stability of the 2 swaping pictures technique for a 29791 color feeling :
In the 1st picture, put the floor integer value of the (32 theoric level)/2 on the (x+y) odd pixels, and the ceil integer value on the (x+y) even pixels
2nd picture, the opposite
The best "mathematical" result for swapping 2 pictures is obtained by using a 2nd picture which includes the opposite of the gaps of 1st optimized picture result but it makes a noisy 2nd pictures more difficult to optimize and less stable if you look closer to your screen. To illustrate, you can make a new grey by switching between black and white but the more stable result is by mixing a strong grey and a light grey.
Cyg
|
[All messages in this thread] [Start new thread]
|
Topic
|
Posted by
|
Date
|
|
Multi Palette File format
|
zerkman
|
Oct,09.2012-00:58
|
|
Re: Multi Palette File format
|
Jace
|
Oct,09.2012-06:15
|
|
Re: Multi Palette File format
|
ggn
|
Oct,09.2012-19:54
|
|
Re: Multi Palette File format
|
evil
|
Oct,10.2012-16:55
|
|
Re: Multi Palette File format
|
zerkman
|
Oct,10.2012-21:53
|
|
Re: Multi Palette File format
|
baah
|
Oct,10.2012-23:07
|
|
Re: Multi Palette File format
|
Jace
|
Oct,11.2012-08:58
|
|
Re: Multi Palette File format
|
nativ
|
Oct,11.2012-20:33
|
|
Re: Multi Palette File format
|
Cyg
|
Oct,12.2012-13:12
|
|
Re: Multi Palette File format
|
nativ
|
Oct,12.2012-15:08
|
|
Re: Multi Palette File format
|
zerkman
|
Oct,13.2012-09:00
|
|
Re: Multi Palette File format
|
evil
|
Oct,11.2012-15:29
|
|
Re: Multi Palette File format
|
zerkman
|
Oct,11.2012-16:57
|
|
Re: Multi Palette File format
|
evil
|
Oct,11.2012-18:41
|
|
Re: Multi Palette File format
|
s_t_s
|
Oct,14.2012-15:58
|
|
Re: Multi Palette File format
|
Petari
|
Dec,07.2012-15:40
|
What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
|
