Mythma
Color chart is converted to grayscale formula very simple:
Y = 0.3red 0.59green 0.11
Blue
The way to use GDI is used in two: 1. Modify the pixel point directly with the above formula 2. Use ColorMatrix. Below is an example of implementing the ColorMatrix:
Using
Namespace
GDIPLUS; Image IMG (WSZFileName); Graphics Graphics (Getdc ()
->
GetsafeHDC ()); ColorMatrix CM
=
{0.3F, 0.3F, 0.3F, 0, 0, 0.59F, 0.59F, 0.59F, 0, 0, 0.11F, 0.11F, 0.11F, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1}
ImageAttributes IA; IA.SETColorMatrix
&
cm);
Float
x
=
(
Float
) img.getwidth ();
Float
y
=
(
Float
) img.getheight (); graphics.drawimage
&
IMG, Rectf
0.0F
,
0.0F
, x, y,
0.0F
,
0.0F
, X, Y, Unitpixel,
&
IA);
