/// <summary>
/// Determines whether a pixel
/// instance is a yellow-dot
/// </summary>
private static bool IsYellowDot(ImGearDIB igDIB, int x_position, int y_position)
{
const int redChannel = 0;
const int greenChannel = 1;
const int blueChannel = 2;
int red, green, blue;
/////////////////////////////////////////////////////////////////////////////////////////////////////////
// This remainder of this function will be left for contestants to implement
//
// Hint:
// Gets a pixel from the ImGearDIB instance.
// https://help.accusoft.com/ImageGear-Net/v24.11/Windows/HTML/webframe.html#topic3854.html
// Sets variables red, green, and blue with their appropriate values from ImGearPixel instance.
// https://help.accusoft.com/ImageGear-Net/v24.11/Windows/HTML/webframe.html#topic4189.html
//
// contestant implementation ------------------------------------------------------------------------------
ImGearPixel p = igDIB.GetPixelCopy(x_position, y_position);
red = p[0];
green = p[1];
blue = p[2];
// end contestant implementation --------------------------------------------------------------------------
/////////////////////////////////////////////////////////////////////////////////////////////////////////
CMYKColor cmyk = new CMYKColor(red, green, blue);
return(YellowThreshold(cmyk.yellow));
}
static void WriteColumn(ImGearRasterPage outPage, int xCoordinate, int value)
{
var pixel = new ImGearPixel(3, 8);
pixel[0] = pixel[1] = pixel[2] = value;
// Write a pixel value to each y-coordinate, given an x-coordinate (ie. write a full column of the same pixel)
// <code here>
}
//This function should return an ImGearPage that contains the extracted hidden image
public static ImGearPage ExtractHiddenImage(ImGearPage mergedImage)
{
int bitNum = 1;
int bitShift = mergedImage.DIB.BitsPerChannel - bitNum;
int bitMask = 0xFF >> bitShift;
int imageWidth = mergedImage.DIB.Width;
int imageHeight = mergedImage.DIB.Height;
// initialize blank ImGearRasterPage
ImGearPage hidden = new ImGearRasterPage(imageWidth, imageHeight, new ImGearColorSpace(ImGearColorSpaceIDs.RGBA), new int[] { 8, 8, 8, 8 }, true);
// For Each Pixel
for (int x = 0; x < imageWidth; ++x)
{
for (int y = 0; y < imageHeight; ++y)
{
// Copy Pixel
ImGearPixel s = mergedImage.DIB.GetPixelCopy(x, y);
ImGearPixel p = new ImGearPixel(4, 8);
//For Each Channel
for (int c = 0; c < 3; ++c)
{
// Get Low bit
bool bit = (s[c] & (1 << 0)) != 0;
// Set to Either 1 or 0 Followed by 7 0s
if (bit)
{
p[c] = 128; //10000000
}
else
{
p[c] = 0; //0000000
}
}
// Keep Alpha Channel Intact
p[3] = 255;
// Set the Pixel
hidden.DIB.UpdatePixelFrom(x, y, p);
}
}
// Return Extracted Image
return(hidden);
}
