conveting colour image to blank n white

To convert color image in to black n white it first convert in to gray scale
by using formula

the formula that converts a color to gray shade is
R/G/B = (red * 0.30) + (green * 0.59) + (blue * 0.11)

and i write code in visual c++ 2008 express edition as

int grayval
for(int i=0;i<=bitmapsize;i++)
{
grayval=(pixel(i).red*0.30+pixel(i).green*0.59+pixel(i).blue*0.11);
}


now what is the next step to convert this gray image to black and white image
sir plz help me
i m very thankful to u
aansa

Comments

  • use this bro

    [code]
    // i thought pixel. is struct-array
    int grayval[bitmapsize+1];//i put +1 just to be sure you dont leak mem
    for(int i=0;i<=bitmapsize;i++)
    {
    grayval[i]=(pixel[i].red*0.30+pixel[i].green*0.59+pixel[i].blue*0.11);
    }

    //if pixel. is a struct fuction, then
    for(int i=0;i<=bitmapsize;i++)
    {
    grayval[i]=(pixel(i).red*0.30+pixel(i).green*0.59+pixel(i).blue*0.11);
    }
    [/code]
    have fun bro
    ----------
    gwbasic 10 CLS
    qbasic A$=INKEY$
    fortran printf("hello word");
    labview |_|--->|_|-|-|_|----->o
    c if(A=='q') {
    cobol MOVE "hello world" TO A
    c++ }
    algol END
    pascal .
  • if you did get theimage with getimage()
    read each pixel and use putpixel(x,y,color)
    ----------
    gwbasic 10 CLS
    qbasic A$=INKEY$
    fortran printf("hello word");
    labview |_|--->|_|-|-|_|----->o
    c if(A=='q') {
    cobol MOVE "hello world" TO A
    c++ }
    algol END
    pascal .
  • do you know how getimage() saves a pixel in memory? 3 bytes for 1pixel?
    if so, delete each 3 bytes per pixel and write equal numbers of R G B for example: 0R,0G,0B is black, 255R,255G,255B is white, you want grey right, you have your formula greyval=.... get it and put it 3 times per pixel for each basic-color(r,g,b). or you can crash your OS :D
    ----------
    gwbasic 10 CLS
    qbasic A$=INKEY$
    fortran printf("hello word");
    labview |_|--->|_|-|-|_|----->o
    c if(A=='q') {
    cobol MOVE "hello world" TO A
    c++ }
    algol END
    pascal .
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Categories

In this Discussion