diff --git a/MagickCore/quantize.c b/MagickCore/quantize.c
index 81f8724..a4c3d7b 100644
--- a/MagickCore/quantize.c
+++ b/MagickCore/quantize.c
@@ -380,7 +380,8 @@
const char
*option;
- quantize_info->dither=image_info->dither;
+ quantize_info->dither_method=image_info->dither == MagickFalse ?
+ NoDitherMethod : RiemersmaDitherMethod;
option=GetImageOption(image_info,"dither");
if (option != (const char *) NULL)
quantize_info->dither_method=(DitherMethod) ParseCommandOption(
@@ -528,7 +529,7 @@
/*
Create a reduced color image.
*/
- if ((cube_info->quantize_info->dither != MagickFalse) &&
+ if ((cube_info->quantize_info->dither_method != NoDitherMethod) &&
(cube_info->quantize_info->dither_method != NoDitherMethod))
(void) DitherImage(image,cube_info,exception);
else
@@ -1042,7 +1043,6 @@
return(clone_info);
clone_info->number_colors=quantize_info->number_colors;
clone_info->tree_depth=quantize_info->tree_depth;
- clone_info->dither=quantize_info->dither;
clone_info->dither_method=quantize_info->dither_method;
clone_info->colorspace=quantize_info->colorspace;
clone_info->measure_error=quantize_info->measure_error;
@@ -2040,7 +2040,7 @@
return((CubeInfo *) NULL);
cube_info->root->parent=cube_info->root;
cube_info->quantize_info=CloneQuantizeInfo(quantize_info);
- if (cube_info->quantize_info->dither == MagickFalse)
+ if (cube_info->quantize_info->dither_method == NoDitherMethod)
return(cube_info);
/*
Initialize dither resources.
@@ -2298,7 +2298,6 @@
assert(quantize_info != (QuantizeInfo *) NULL);
(void) ResetMagickMemory(quantize_info,0,sizeof(*quantize_info));
quantize_info->number_colors=256;
- quantize_info->dither=MagickTrue;
quantize_info->dither_method=RiemersmaDitherMethod;
quantize_info->colorspace=UndefinedColorspace;
quantize_info->measure_error=MagickFalse;
@@ -2322,7 +2321,7 @@
% The format of the PosterizeImage method is:
%
% MagickBooleanType PosterizeImage(Image *image,const size_t levels,
-% const MagickBooleanType dither,ExceptionInfo *exception)
+% const DitherMethod dither_method,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
@@ -2331,8 +2330,8 @@
% o levels: Number of color levels allowed in each channel. Very low values
% (2, 3, or 4) have the most visible effect.
%
-% o dither: Set this integer value to something other than zero to dither
-% the mapped image.
+% o dither_method: choose from UndefinedDitherMethod, NoDitherMethod,
+% RiemersmaDitherMethod, FloydSteinbergDitherMethod.
%
% o exception: return any errors or warnings in this structure.
%
@@ -2349,7 +2348,7 @@
}
MagickExport MagickBooleanType PosterizeImage(Image *image,const size_t levels,
- const MagickBooleanType dither,ExceptionInfo *exception)
+ const DitherMethod dither_method,ExceptionInfo *exception)
{
#define PosterizeImageTag "Posterize/Image"
#define PosterizePixel(pixel) (Quantum) (QuantumRange*(MagickRound( \
@@ -2462,7 +2461,7 @@
quantize_info=AcquireQuantizeInfo((ImageInfo *) NULL);
quantize_info->number_colors=(size_t) MagickMin((ssize_t) levels*levels*
levels,MaxColormapSize+1);
- quantize_info->dither=dither;
+ quantize_info->dither_method=dither_method;
quantize_info->tree_depth=MaxTreeDepth;
status=QuantizeImage(quantize_info,image,exception);
quantize_info=DestroyQuantizeInfo(quantize_info);
@@ -2761,7 +2760,7 @@
colors=maximum_colors;
for (depth=1; colors != 0; depth++)
colors>>=2;
- if ((quantize_info->dither != MagickFalse) && (depth > 2))
+ if ((quantize_info->dither_method != NoDitherMethod) && (depth > 2))
depth--;
if ((image->matte != MagickFalse) && (depth > 5))
depth--;
@@ -2872,7 +2871,7 @@
colors=maximum_colors;
for (depth=1; colors != 0; depth++)
colors>>=2;
- if (quantize_info->dither != MagickFalse)
+ if (quantize_info->dither_method != NoDitherMethod)
depth--;
}
/*
