半肾
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战斗力 鹅
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注册时间 2009-11-20
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回 60楼(olipen) 的帖子
还要继续么……来,全文
Unlike the two previous scenarios in which light is either generous (studio) or stability is assured (landscape), photojournalists and action photographers often struggle with low available light and high motion. Achieving usable image quality is often difficult when pushing ISO.
When shooting a moving scene such as a sports event, action photographers’ primary objective is to freeze the motion, giving priority to short exposure time. To compensate for the lack of exposure, they have to increase the ISO setting, which means the SNR will decrease. How far can they go while keeping decent quality? Our low-light ISO metric will tell them.
The SNR indicates how much noise is present in an image compared to the actual information (signal). The higher the SNR value, the better the image looks, because details aren't drowned by noise. SNR strength is given in dB, which is a logarithmic scale: an increase of 6 dB corresponds to doubling the SNR, which equates to half the noise for the same signal.
An SNR value of 30dB means excellent image quality. Thus low-light ISO is the highest ISO setting for a camera that allows it to achieve an SNR of 30dB while keeping a good dynamic range of 9 EVs and a color depth of 18bits.
A difference in low-light ISO of 25% represents 1/3 EV and is only slightly noticeable.
As cameras improve, low-light ISO will continuously increase, making this scale open.
既然看了全文,你依然觉得那个分数只是单纯在说高iso的信噪比表现?
我拿这个分数衡量高感表现?我都告诉你具体性能不看分数看测试图表了,你要不翻翻楼?
我说RX100高感差一截,因为我正在用,我也对比了其它机器,你呢?

来,RX100的信噪比测试。
最终结果?来再给你一次。

是不是符合你嘴里“5N比7好”?

和你嘴里的“5D2和D800高感表现相近”相符么?
“不科学的缩图”也好,信噪比也好,自己打脸都打成这样了,还要继续“毫无说服力”么。 |
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