PixelSetColor Method (GdPictureImaging)
In This Topic
Sets the color of a specified pixel in a GdPicture image.
Syntax
'Declaration
Public Function PixelSetColor( _
ByVal As Integer, _
ByVal As Integer, _
ByVal As Integer, _
ByVal As GdPictureColor _
) As GdPictureStatus
public GdPictureStatus PixelSetColor(
int ,
int ,
int ,
GdPictureColor
)
public function PixelSetColor(
: Integer;
: Integer;
: Integer;
: GdPictureColor
): GdPictureStatus;
public function PixelSetColor(
: int,
: int,
: int,
: GdPictureColor
) : GdPictureStatus;
public: GdPictureStatus PixelSetColor(
int ,
int ,
int ,
GdPictureColor
)
public:
GdPictureStatus PixelSetColor(
int ,
int ,
int ,
GdPictureColor
)
Parameters
- ImageID
- GdPicture image identifier.
- DstLeft
- Value that specifies the x-coordinate (column) of the pixel.
- DstTop
- Value that specifies the y-coordinate (row) of the pixel.
- PixelColor
- The color to apply, as Color object. A suitable color value can be obtained by using the ARGB() method.
Return Value
A member of the GdPictureStatus enumeration.
Example
Getting the red channel histogram of a jpeg image and creating an image representing this histogram.
using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.jpg", false);
// Get the red channel histogram and the image dimensions.
int[] histo = new int[256];
gdpictureImaging.HistogramGetRed(imageID, ref histo);
int count = gdpictureImaging.GetWidth(imageID) * gdpictureImaging.GetHeight(imageID);
gdpictureImaging.ReleaseGdPictureImage(imageID);
// Create an image representing the histogram.
// The image has the same width as the histogram and its height is 1000.
int histogramID = gdpictureImaging.CreateNewGdPictureImage(256, 1000, 24, Color.White);
for (int i = 0; i < 256; i++)
{
int value = histo[i] * 1000 / count;
for (int j = 0; j < value; j++)
{
gdpictureImaging.PixelSetColor(histogramID, i, j, Color.Red);
}
}
gdpictureImaging.SaveAsPNG(histogramID, "histo.png");
gdpictureImaging.ReleaseGdPictureImage(histogramID);
}
Example
Getting the red channel histogram of a jpeg image and creating an image representing this histogram.
using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.jpg", false);
// Get the red channel histogram and the image dimensions.
int[] histo = new int[256];
gdpictureImaging.HistogramGetRed(imageID, ref histo);
int count = gdpictureImaging.GetWidth(imageID) * gdpictureImaging.GetHeight(imageID);
gdpictureImaging.ReleaseGdPictureImage(imageID);
// Create an image representing the histogram.
// The image has the same width as the histogram and its height is 1000.
int histogramID = gdpictureImaging.CreateNewGdPictureImage(256, 1000, 24, Color.White);
for (int i = 0; i < 256; i++)
{
int value = histo[i] * 1000 / count;
for (int j = 0; j < value; j++)
{
gdpictureImaging.PixelSetColor(histogramID, i, j, Color.Red);
}
}
gdpictureImaging.SaveAsPNG(histogramID, "histo.png");
gdpictureImaging.ReleaseGdPictureImage(histogramID);
}
See Also