When the color image is converted into black and white images, it is necessary to calculate the effective brightness value of each pixel in the image, by matching pixels.
The brightness value can be easily converted to black and white images.
Calculate the pixel effective brightness value can use the following formula:
Y = 0.3red 0.59Green 0.11Blue
Then use the color.fromargb (y, y, y) to convert the calculated value.
Conversion code can be implemented using the following method:
[C #]
public
Bitmap ConvertTograscale (Bitmap Source)
{Bitmap BM = New Bitmap (Source.width, Source.Height); for (int y = 0; y [Vb] Public Function ConvertTograscale () Function ConvertTogramyScale (Byval Source As Bitmap) AS Bitmap Dim BM As New Bitmap (Source.width, Source.Height) Dim x Dim y for y = 0 to bm.height for x = 0 To bm.width Dim C as color = Source .Getpixel (x, y) DIM LUMA AS INTEGER = CINT (CR * 0.3 CG * 0.59 CB * 0.1) BM.Setpixel (x, y, color.fromargb (luma, luma, luma) Next Next Return Bmend Function Of course, this is a good way. If you need more simple color conversion, you can use the ColorMatrix class, the next article will introduce [to be continued...]
