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原帖由 @18000rpm  于 2023-3-15 09:26 AM 发表
胶片何来噪点，不都是银盐颗粒吗

类似于高iso下的noise，实际是grain，二者的关系：


The size of the grains in the film varies depending on the film sensitivity. The more sensitive the film, the larger the grains. Digital noise is always the size of a pixel, regardless of the ISO setting.

Film grain is color neutral, as it consist mostly of luminance differences. Digital noise consists of both luminance and color differences, and is most visible in the blue color channel.

In the more recent digital cameras the digital noise is quite even. In earlier models the noise had more banding and patterns. The film grain doesn't have any banding or patterns, so it's seen as pure noise. If the digital noise has any banding or pattern, the brain can easily pick that up, and that is more disturbing than pure noise.

Neither grain nor noise eats detail. It's noise reduction that eats detail, as it can't tell the difference between small details and noise. Noise reduction is used on digital noise, but it can also be used to reduce film grain.

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原帖由 @kkchance  于 2023-3-16 08:07 AM 发表
呵呵，胶片如果保存得当，分辨率比后期所谓数字拍摄高多了

当然，如果模拟规格足够，模拟就是最高级的保存形式，最贴近真实世界的保存形式，因为真实世界本身就是模拟的，参考开盘机

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原帖由 @forwardland  于 2023-3-16 09:46 AM 发表
对 真双层杜比视界，秒杀流媒体那些假货。

那是肯定的，我宁可看高码率的1080p，也不愿意看低码率的4k，前者细节丰富太多了，而且有质感，特别是老片子

本帖最后由 scanlines 于 2023-3-16 10:07 通过手机版编辑