Method of processing pixel of image
1.
Include file:
#include <wx/rawbmp.h>
Pre defination:
typedef wxPixelData<wxBitmap, wxNativePixelFormat> PixelData;
Code example:
unsigned char grey = 0;
wxBitmap* m_pbmp = new wxBitmap(wxT("name.bmp"), wxBITMAP_TYPE_BMP);
PixelData data(*m_pbmp);
PixelData::Iterator p(data);
p.Offset(data, 0, 0);
for ( int y = 0; y < data.GetHeight(); y++ )
{
PixelData::Iterator rowStart = p;
for ( int x = 0; x < data.GetWidth(); x++, p++ )
{
grey = (unsigned char)(0.212671*p.Red() + 0.715160*p.Green() + 0.072169*p.Blue());
p.Red() = (unsigned char)grey;
p.Green() = (unsigned char)grey;
p.Blue() = (unsigned char)grey;
}
p = rowStart;
p.OffsetY(data, 1);
}
2.
Include file: None. Pre defination: None. Code example:
wxImage temp_wxImage;
unsigned char* manipulator = NULL;
manipulator = temp_wxImage.GetData();
int width = temp_wxImage.GetWidth();
int height = temp_wxImage.GetHeight();
int grey = 0;
for(int j = 0; j < height; j++)
for(int i = j*3*width; i < (j+1)*3*width; i+=3)
{
grey = (unsigned char)(0.212671*manipulator[i] +
0.715160*manipulator[i+1] + 0.072169*manipulator[i+2]);
manipulator[i] = grey;
manipulator[i+1] = grey;
manipulator[i+2] = grey;
}
or
wxImage temp_wxImage;
unsigned char* manipulator = NULL;
manipulator = temp_wxImage.GetData();
int width = temp_wxImage.GetWidth();
int height = temp_wxImage.GetHeight();
int grey = 0;
for(int j = 0; j < height; j++)
for(int i = 0; i < width; i++)
{
grey = (unsigned char)(0.212671*manipulator[(i+j*width)*3] +
0.715160*manipulator[(i+j*width)*3+1] +
0.072169*manipulator[(i+j*width)*3+2]);
manipulator[(i+j*width)*3] = grey;
manipulator[(i+j*width)*3+1] = grey;
manipulator[(i+j*width)*3+2] = grey;
}
