#include "HxImageRep.h"
#include "HxColorSpace.h"
#include "HxColor.h"
Go to the source code of this file.
Functions | |
| HxImageRep L_HXIMAGEREP | HxGetColorChannel (HxImageRep im, HxColorModel fromColorSpace, HxColorModel toColorSpace, int channel, int do_normalize) |
| GetColorChannel. More... | |
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GetColorChannel. The function converts an image to a different color model, extracts a channel and optionally normalizes it. Implementation specifics : The function is a sequence of other global functions.
00020 {
00021 HxString fname("HxGetColorChannel");
00022
00023 if (im.isNull())
00024 {
00025 HxGlobalError::instance()->reportError(fname, im.name(), "null image", HxGlobalError::HX_GE_INVALID);
00026 return HxImageRep();
00027 }
00028 if (im.signature().pixelDimensionality() != 3)
00029 {
00030 HxGlobalError::instance()->reportError(fname, "ColorSpace conversions are only valid for Vec3 images", HxGlobalError::HX_GE_INVALID);
00031 return HxImageRep();
00032 }
00033 if ((channel < 1) || (channel > 3))
00034 {
00035 HxGlobalError::instance()->reportError(fname, "Channel must be between 1 and 3", HxGlobalError::HX_GE_INVALID);
00036 return HxImageRep();
00037 }
00038
00039 HxTagList tags;
00040 HxAddTag<HxColorModel>(tags, "fromColorSpace", fromColorSpace);
00041 HxAddTag<HxColorModel>(tags, "toColorSpace", toColorSpace);
00042 im = HxImageAsVec3Double(im);
00043 HxImageRep im_conv = im.unaryPixOp("colorSpace", tags);
00044 if (!do_normalize)
00045 {
00046 return HxProjectRange(im_conv, channel);
00047 }
00048 return HxDiv(HxProjectRange(im_conv, channel), HxNorm1(im_conv));
00049 } |
1.2.12 written by Dimitri van Heesch,
© 1997-2001