Harvey_Taylor@mindlink.UUCP (Harvey Taylor) (03/10/91)
[Thank you Alex M. & Peter K. for previous answers in this discussion]
Background: I want to display some large 256 level greyscale
video samples. The standard Amiga will output only 16 levels.
So, I am trying to figure out the best way to increase the number of
greyscale levels viewable on the (my) Amiga. So far the candidates are:
1) Dithering
2) GreyScale to HAM [SHAM, SHAMM, Dynamic whatever]
3) A colour board
Are there any other options?
Has anybody written an n-bit sample to dithered bitmap routine?
Will HAM (and dynamic brethren) be any use?
What greyscales do the popular 24 bit boards put out?
(ie. DCTV, ColorBurst, HAM-E, A2140, Firecracker 24)
-het
"The ghost of electricity howls through the bones of her face"
- Visions of Johanna
Harvey Taylor Meta Media Productions
uunet!van-bc!rsoft!mindlink!Harvey_Taylor
a186@mindlink.UUCPoliphant@telepro.UUCP (Mike Oliphant) (03/12/91)
In article <5082@mindlink.UUCP> Harvey_Taylor@mindlink.UUCP (Harvey Taylor) writes: > >[Thank you Alex M. & Peter K. for previous answers in this discussion] > > Background: I want to display some large 256 level greyscale > video samples. The standard Amiga will output only 16 levels. > > So, I am trying to figure out the best way to increase the number of > greyscale levels viewable on the (my) Amiga. So far the candidates are: > > 1) Dithering > 2) GreyScale to HAM [SHAM, SHAMM, Dynamic whatever] > 3) A colour board > > Are there any other options? I've achieved some rather nice results by usings shades of purple to emulate 32 shades of grey. Here are the colors I use: UWORD colortable[32]={0x000,0x102,0x111,0x213,0x222,0x324,0x333,0x435,0x444, 0x546,0x555,0x657,0x666,0x768,0x777,0x879, 0x888,0x98a,0x999,0xa9b,0xaaa,0xbac,0xbbb,0xcbd,0xccc, 0xdce,0xddd,0xedf,0xeee,0xfef,0xfff,0xfff}; -- Mike Oliphant herald!telepro!oliphant or telepro!oliphant@herald.usask.ca FidoNet: (1:140/91) - ZMH only * * Call TelePro, the development system for DLG Professional * * Phone: +1 306 249 2352 2400/9600/14400 bps HST - FidoNet: (1:140/90) * +1 306 652 2084 300/1200/2400 bps *
peterk@cbmger.UUCP (Peter Kittel GERMANY) (03/15/91)
In article <5082@mindlink.UUCP> Harvey_Taylor@mindlink.UUCP (Harvey Taylor) writes: > > Background: I want to display some large 256 level greyscale > video samples. The standard Amiga will output only 16 levels. > > So, I am trying to figure out the best way to increase the number of > greyscale levels viewable on the (my) Amiga. So far the candidates are: > > 1) Dithering Should work. Remember, you can take a HiRes screen, so your resolution is still at least LoRes. (Don't know from heart how many grey scales you can get from this, sure not 256 :-) > 2) GreyScale to HAM [SHAM, SHAMM, Dynamic whatever] If you don't have extra hardware connected: NO solution. > 3) A colour board If it's 24 bits, then yes. > > Will HAM (and dynamic brethren) be any use? NO, sorry. > What greyscales do the popular 24 bit boards put out? > (ie. DCTV, ColorBurst, HAM-E, A2140, Firecracker 24) Those which really provide 8 bits per color component RGB, give you exactly 256 grey shades. -- Best regards, Dr. Peter Kittel // E-Mail to \\ Only my personal opinions... Commodore Frankfurt, Germany \X/ {uunet|pyramid|rutgers}!cbmvax!cbmger!peterk
steve@wildcat.UUCP (Steve Holland) (03/17/91)
>In article <961@cbmger.UUCP> peterk@cbmger.UUCP (Peter Kittel GERMANY) writes: >In article <5082@mindlink.UUCP> Harvey_Taylor@mindlink.UUCP (Harvey Taylor) writes: >> >> Background: I want to display some large 256 level greyscale >> video samples. The standard Amiga will output only 16 levels. Assuming you have an A500/A2000(/3000?), you can use the little "mono" jack at the back to get 4096 grey scales in HAM mode. You can also use EHB mode for 64 colors+dithering. -- ----------->Steve Holland<----------- Internet: wildcat!steve@alfalfa.com | "I never let my schooling get in the USENET: ...!alphalpha!wildcat!steve | way of my education" -Mark Twain <if alfalfa doesn't work, try alphalpha>