I have loaded graphic in picturebox and extracted the nos. of pixels throgh the GetPixel API. However, the sum of individual pixel value do not match the total pixel value.
e.g. The total pixel count for a Black & White Picture say is z. Suppose, x & y are pixel counts for VBBlack and VBWhite respectively.  x & Y do not add upto z. x+y<>z.

Pls. throw some light.  

Can you please describe a little clearly what you wanna do actually.Its something very hard to understand what you wanna say...

Regards,
ASim siddiqui.

Actually I want to make microstructure analyaer. As a first step I loaded the micrograph (consisting entirely of black and white components) in the pictire box. Through the GetPixel API I found out the total pixelcount as well as the black pixel as well as the white pixels.

dim scanx, scany, pixcount as long
dim pixb,pixw as long

for scanx=0 to picture1.scalewidth-1
for scany=0 to picture1.scaleheight-1
   pixcount=pixcount+1
   if (getpixel(picture1.hdc,scanx,scany)=vbblack) then
   pixb=pixb+1
  end if
  
if (getpixel(picture1.hdc,scanx,scany)=vbwhite) then
   pixw=pixw+1
  end if
  
  next scany
next scanx

since the micrograph fitted exactly in the picbox,
pixcount should be equal to pixb+pixw

pixcount=pixb+pixw

But actually it is not so. Why? Kindly throw some light.

Hi there,
Change this code a little bit.Use the following one:

dim scanx, scany, pixcount as long
dim pixb,pixw as long

pixcount=picture1.scalewidth*picture1.scaleheight
for scanx=0 to picture1.scalewidth
for scany=0 to picture1.scaleheight
   if GetPixel(picture1.hdc,scanx,scany) then
      pixw=pixw+1
  end if
  next scany
next scanx
pixb = pixcount-pixw

Regards,
Asim Siddiqui...