Passport photo editing

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au passport     3.75 x 4.75 cm  3.5-4.0 x 4.5 - 5.0cm
head                3.4 cm(3.2 - 3.6)

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chinese passport 
head 28-33mm length 21mm-24mm width
2x2 inches

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original photo:

head 73.75cm
resolution: 28.346  pixels/cm

28.346*73.75/3.4 = 614.858 pixels/cm

head 69.74
resolution: 28.346 pixels/cm
28.346*69.74/3.4 = 581.426 pixesl/cm

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New Element size:
614.858 pixels/cm      3.75 x 4.75 cm

New Element size:
581.426 pixels/cm      3.75 x 4.75 cm


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AU Passport 6 elemetes size:
581.426 pixels/cm      4 x 6 inches