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mfd_hlp
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\ApAssist
\: - This is the Quick Help for the file i/o set dither type panel -
\: ---------------------------------------------------------------------
\: Written by David E. Patterson
\: ---------------------------------------------------------------------
\font topaz.font 8
\tc 1
\wr
\lj
\dd "imh_descriptor"
\index "hlp_index/index"
\toc "hlp_toc/toc"
\help "aa_help/help
\node "mfd_nodith"
\title "No Dither"
\next "mfd_2pntedd"
\prev ""
This selection will specify that no dither is to be used in the rendered
output. Instead, the nearest color in the palette will be used.
\endnode
\node "mfd_2pntedd"
\title "Two Point EDD"
\next "mfd_fs"
\prev "mfd_nodith"
This dither has the most color accuracy, but produces rough images due to
heavy dithering.
\endnode
\node "mfd_fs"
\title "Floyd-Steinberg"
\next "mfd_jjn"
\prev "mfd_2pntedd"
This is the best compromise for dither types. It has a good color selection,
and is not \{ \ts i too \} rough.
\endnode
\node "mfd_jjn"
\title "Jarvis, Judice, Ninke"
\next "mfd_stucki"
\prev "mfd_fs"
This dithering type is a little too smooth, and has a tendency to show Mach
Bands.
\endnode
\node "mfd_stucki"
\title "Stucki"
\next "mfd_ranfs"
\prev "mfd_jjn"
This dithering type is extremely smooth and shows a good deal of contouring.
\endnode
\node "mfd_ranfs"
\title "Random F-S"
\next "mfd_dualranfs"
\prev "mfd_stucki"
This dithering type is best for hiding errors. It has a good color selection
and is fairly rough.
\endnode
\node "mfd_dualranfs"
\title "Dual Random F-S"
\next "mfd_Ai"
\prev "mfd_ranfs"
This is similar to the \{ \ts i \tc 10 Random F-S \} , but with out as much
clumpping. It also has good color selection, and is not as rough as the \{
\ts i \tc 10 Random F-S \} .
\endnode
\node "mfd_Ai"
\title "Ai Mode"
\next "mfd_checkov"
\prev "mfd_dualranfs"
This selection should generally be used for all rendering. It, in most
cases, will produce a \{ \ts i better \} dithering effect.
\endnode
\node "mfd_checkov"
\title "Checkov Forcing"
\next "mfd_entropy"
\prev "mfd_Ai"
This will dither using color selections based on the brighter colors in the
image.
\endnode
\node "mfd_entropy"
\title "Entropy Enhance"
\next "mfd_turnexcursionlim"
\prev "mfd_checkov"
This selection will reduce the overall effect of the dithering.
\endnode
\node "mfd_turnexcursionlim"
\title "Turn off Excursion Limit"
\next ""
\prev "mfd_entropy"
This operation works with dithering to provide a larger color space. When
this button is selected the dithering operations can reach more colors in the
color space. This may produce a \{ \ts i rougher \} image, but in most cases
produces a better image. Try it both ways to decide which is best for your
image.
\endnode