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Modifying bitmap data

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Modifying bitmap data

Subject: Modifying bitmap data
From: Joel Reymont <email@hidden>
Date: Mon, 8 Aug 2005 01:02:37 +0200

Folks,

I'm trying to modify the bits of the image and the changes don't seem to take effect once the image is displayed. Any tips?

NSBitmapImageRep *imageRep = [[NSBitmapImageRep alloc] initWithData: [image TIFFRepresentation]];

    int w = [imageRep pixelsWide];
    int h = [imageRep pixelsHigh];

    unsigned char *data = [imageRep bitmapData];

    int x, y;

   for ( y = 0; y < h; y++ ) {
    for ( x = 0; x < w; x++ ) {
          *(data + w * y + x) = 0;
    }
  }

  Thanks, Joel

--
http://wagerlabs.com/uptick

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