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-
- akJFIFPrefs.doc
-
- ⌐ 1996 by Andreas R. Kleinert.
- FREEWARE. All rights reserved.
-
- Version : 43.5
- Release Date : 20.10.1996
-
- Description
- ~~~~~~~~~~~
- akJFIFPrefs is the Preferences Program for akJFIF.datatype.
- GUI has been created with Designer 1.54 by Ian O'Connor.
- Icon by Detlef Winkler (same as SVPrefs.info)
-
- You can do the following, settings, which will be written
- to ENV: and/or ENVARC: into a settings file called
- "Datatypes/akJFIF.prefs":
-
- 1) DECODE_METHOD=(FAST_INTEGER|SLOW_INTEGER|FLOATING_POINT)
- 2) DITHERMODE=(NO_DITHERING|DITHER_FLOYD-STEINBERG|DITHER_ORDERED|
- HAM_OUTPUT)
- 3) V43MODE=(256|24BIT)
- 4) HAM_MODE=(HAM6|HAM8)
- 5) COLOR_QUANTIZING=(SLOW|FAST)
- 6) UPSAMPLING=(ON|OFF)
- 7) PROGRESSBAR=(ON|OFF)
-
- That's mostly self-explaining, but as an example,
- here are the default settings and a short explanation:
-
- DECODE_METHOD=FAST_INTEGER
- DITHERMODE=DITHER_ORDERED
- V43_MODE=24BIT
- HAM_MODE=HAM6
- COLOR_QUANTIZING=FAST
- UPSAMPLING=OFF
- PROGRESSBAR=ON
-
- Please note, that it does not suffice to simply specify the prefered
- options. Some also do react as switches. Here are some examples how
- to manage specific configurations:
-
- HAM Output (V40/V43): DECODE_METHOD=FAST_INTEGER *
- DITHERMODE=HAM_OUTPUT
- V43_MODE=256
- HAM_MODE=HAM8 *
- UPSAMPLING=OFF *
-
- Dithered Output (V40/V43): DECODE_METHOD=FAST_INTEGER *
- DITHERMODE=DITHER_ORDERED *1
- V43_MODE=256
- COLOR_QUANTIZING=FAST *
- UPSAMPLING=OFF *
-
- 256 Colors (V40/V43): DECODE_METHOD=FAST_INTEGER *
- DITHERMODE=NO_DITHERING
- V43_MODE=256
- COLOR_QUANTIZING=FAST *
- UPSAMPLING=OFF *
-
- 24 Bit (V43): DECODE_METHOD=FAST_INTEGER *
- DITHERMODE=NO_DITHERING
- V43_MODE=24BIT
- UPSAMPLING=OFF *
-
- * may be changed
- *1 maybe changed to: DITHER_FLOYD-STEINBERG
-
-
- General Explanation of Options
- ==============================
-
- 1) DECODE_METHOD
- ----------------
- SLOW_INTEGER: slot, but accurate integer algorithm
- FAST_INTEGER: faster, but less accurate integer algorithm
- FLOATING_POINT: floting point algorithm
-
- 2) DITHERMODE
- -------------
- NO_DITHERING: no dithering, best pen selection
- DITHER_FLOYD-STEINBERG: slow, hight quality, floyd-steinberg dithering
- DITHER_ORDERED: ordered dithering on fixed palette
- HAM_OUTPUT: generate HM output from 24 Bit data
-
- 3) V43_MODE (only with "NO_DITHERING")
- -----------
- 256: enables dithered 256 color output for V43 picture.datatype
- 24BIT: does raw 24 Bit output with V43 picture.datatype
-
- 4) HAM_MODE (only with "HAM_OUTPUT")
- -----------
- HAM6: generates HAM6 output
- HAM8: generates HAM8 output
-
- 5) COLOR_QUANTIZING (not with "DITHER_ORDERED", "HAM_OUTPUT" or 24 Bit)
- -------------------
- FAST: high speed color quantization
- SLOW: high quality color quantization
-
- 6) UPSAMPLING
- -------------
- ON: do careful upsampling of chroma components
- OFF: do faster, but sloppier upsampling of chrom components
- (often very small visual impact)
-
- 7) PROGRESSBAR
- --------------
- ON: pop up percentage display
- OFF: do not pop up percentage display
-
-