GdPictureImaging.GetPixelArrayByte8bpp Method

Stores into an array of bytes the pixel indexes of an area of a paletized 8bpp GdPicture image.

public GdPictureStatus GetPixelArrayByte8bpp(
    int ImageID, 
    ref Byte arPixels, 
    int SrcLeft, 
    int SrcTop, 
    int Width, 
    int Height
);

Visual Basic

Public Function GetPixelArrayByte8bpp(
    ByVal ImageID As Integer, 
    ByRef arPixels() As Byte, 
    ByVal SrcLeft As Integer, 
    ByVal SrcTop As Integer, 
    ByVal Width As Integer, 
    ByVal Height As Integer
) As GdPictureStatus

Parameters

Parameters	Description
ImageID	GdPicture Image Identifier.
arPixels	Output parameter. Array of pixel indexes. each entry of the array is a reference to a palette index [0 - 255].
SrcLeft	The left source pixel of the area.
SrcTop	The top source pixel of the area.
Width	The width of the area in pixel.
Height	The height of the area in pixel.

Returns

A member of the GdPictureStatus enumeration.

Remarks

This function works only with 8bpp image.

Related Topics

SetPixelArrayByte8bpp

Example

usage of GetPixelArrayByte8bpp() and SetPixelArrayByte8bpp() functions to apply negative effect on a 8bpp grayscale GdPicture image.

Copy Code

Dim oGdPictureImaging As New GdPictureImaging
Dim arPixel() As Byte
Dim X As Integer
Dim Y As Integer
Dim ImageID As Integer
Dim ImageHeight As Integer
Dim ImageWidth As Integer
 
oGdPictureImaging.SetLicenseNumber("XXX") 'Replace XXX by a demo or commercial license key
ImageID = oGdPictureImaging.CreateGdPictureImageFromFile("8bppimage.tif")
ImageHeight = oGdPictureImaging.GetHeight(ImageID)
ImageWidth = oGdPictureImaging.GetWidth(ImageID)
 
ReDim arPixel(ImageWidth * ImageHeight)
oGdPictureImaging.GetPixelArrayByte8bpp(ImageID, arPixel, 0, 0, ImageWidth, ImageHeight)
 
For X = 0 To ImageWidth - 1
   For Y = 0 To ImageHeight - 1
      arPixel((Y * ImageWidth) + X) = Not arPixel((Y * ImageWidth) + X)
   Next Y
Next X
oGdPictureImaging.SetPixelArrayByte8bpp(ImageID, arPixel, 0, 0, ImageWidth, ImageHeight)
oGdPictureImaging.SaveAsTIFF(ImageID, "8bppimageneg.tif", TiffCompression.TiffCompressionAUTO)
oGdPictureImaging.ReleaseGdPictureImage(ImageID)