SFImages are written to file as three integers nxpixel nypixel numcomponents=1..4
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representing the width, height and number of components in the image, followed by nxpixel*nypixel hexadecimal values representing the pixels in the image, separated by whitespace.
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A one-component image will have one-byte hexadecimal values representing the intensity of the image.
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For example, 0xFF is full intensity, 0x00 is no intensity.
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A two-component image puts the intensity in the first (high) byte and the transparency in the second (low) byte.
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Pixels in a three-component image have the red component in the first (high) byte, followed by the green and blue components (so 0xFF0000 is red).
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Four-component images put the transparency byte after red/green/blue (so 0x0000FF80 is semi-transparent blue).
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A value of 1.0 is completely transparent, 0.0 is completely opaque.
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