For best result, you should be able to differentiate 10 shades in the above scale.
If not, adjust brightness / contrast / gamma. (100% - 90% in particular)

通告: 在iPhone上有一個app可以看到我的作品,請在iPhone App Store免費download HKFaces 就可以了。多謝支持^^

在「數碼攝影 DC Photo」第101期, 有本相簿的介紹。多謝支持^^

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多謝收看!!!^^