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[rocotilos]

Just made this. The above also works but, seems too many calculation in the loop making the process lag a bit.

This one, is better for adjusting contrast:

contrast is a UISlider with value 0-200, default 100.

int aRed = data[index+1];
			 int aGreen = data[index+2];
			 int aBlue = data[index+3];
			 
			 aRed = (((aRed-128)*contrast.value )/100) + 128;
			 if (aRed < 0) aRed = 0; if (aRed>255) aRed=255;
			 data[index+1] = aRed;
			 
			 aGreen = (((aGreen-128)*contrast.value )/100) + 128;
			 if (aGreen < 0) aGreen = 0; if (aGreen>255) aGreen=255;
			 data[index+2] = aGreen;
			 
			 aBlue = (((aBlue-128)*contrast.value )/100) + 128;
			 if (aBlue < 0) aBlue = 0; if (aBlue>255) aBlue=255;
			 data[index+3] = aBlue;