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[rocotilos]

I ditched the colorize filter.

I found a contrast filter instead.

thevalue range must be between 0 and 4.

for(int index=0;index<length;index+=4){
			double amountRed;
			double amountGreen;
			double amountBlue;
			
			
			amountRed = (double)data[index+1]/255;
			amountRed -= 0.5;
			amountRed *= thevalue;
			amountRed += 0.5;
			amountRed *= 255;
			if (amountRed <0 ) amountRed = 0;
			if (amountRed>255) amountRed = 255;
			
			
			amountGreen = (double)data[index+2]/255;
			amountGreen -= 0.5;
			amountGreen *= thevalue;
			amountGreen += 0.5;
			amountGreen *= 255;
			if (amountGreen <0 ) amountGreen = 0;
			if (amountGreen>255) amountGreen = 255;
			
			amountBlue = (double)data[index+3]/255;
			amountBlue -= 0.5;
			amountBlue *= thevalue;
			amountBlue += 0.5;
			amountBlue *= 255;
			if (amountBlue <0 ) amountBlue = 0;
			if (amountBlue>255) amountBlue = 255;
			
			
			data[index+1] = (Byte)amountRed;
			data[index+2] = (Byte)amountGreen;
			data[index+3] = (Byte)amountBlue;
		}

While playing around with manipulating pixels, I also found Artistic Pen Sketch filter!!!