Orquid "Phoenix"

Orquid "Phoenix"

by ceinmart

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20

The size of the grains in the film varies depending on the film sensetivity. The more sensetive 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 ...


8

Scanners are effectively digital cameras so they do introduce noise but not very much, what you're seeing is the film grain. ISO400 film is very grainy when compared to ISO400 on a modern DSLR. This often gets forgotten when comparing film to digital (resolution or otherwise). Grain aside (which as already stated isn't always objectionable) the photolab ...


6

ISO 400 film is almost always going to have grain that's at least somewhat visible. I can't really tell if you underexposed the picture or not, but underexposure will generally make the grain much more apparent. Different scanners show grain to (slightly) differing degrees. Basically, the smaller the light source, the sharper a rendition of the finest ...


6

There's also the issue of chroma (color) vs. luma (brightness) digital noise. People generally find chroma noise more objectionable because it appears less natural; this is why noisy photographs sometimes work better in a B&W conversion. The better noise reduction algorithms can also address one or the other selectively. I believe that film has pretty ...


3

SILVER use in photographic emulsions was a practical and cheaper concession after gold and platinum. While I have never used any of these materials, personally, I have seen prints of plates made from them on display at the George Eastman House in Rochester, New York. They may still be there. Platinotypes [sp?] had twice the greyscale of silver which seemed ...


3

Alkali earth metals have some photosensitivity. Not nearly as good as AgX, though. I'm assuming you realize that silver halide is not a single material, but refers to silver in combination with any of the halides: fluoride, chloride, bromide, iodide. Usually alternative processes use various combinations of these.


2

An interesting take is to scan an empty film frame and use this noise frame as an overlay. In the following photo, I have moved the grain layer halfway to the right so that you can see the effect more clearly: This is how the grain looks in detail (you probably want to open the image to skip the compression and resizing artifacts): This looks very nice ...


2

There are multiple solutions for that: On a vanilla factory Adobe Photoshop without any plugins: What I use to do is to create a 50% gray layer ( rgb(128, 128, 128) ) that I put in one of the following blending modes: Overlay, Soft Light or Hard Light, doing so your layer won't have any effect because those blending modes are 50% gray centered. Then I do a ...


2

The biggest difference is the patterns in the noise. Film grain is caused by the grains of silver present in the film, and are not in a consistent pattern. ISO noise is caused in the digital sensor and is pixel based, and therefore in a pattern. Some feel that film gran is more pleasing because of the inconsistent pattern in which the noise occurs.


1

I know exactly what I would do, and in fact have done in the past, but my answer is likely to be useless to anyone here. You'll have to be an image processing math freak. Like others say, scan at the highest res possible. I'd use high-power interactive math tools like Matlab or IDL to analyze the image into a high-frequency grainy part and a smooth part. ...


1

Higher ISO film tended to have more grain; and higher ISO digital shots exhibit more noise - a similar cause, but the visual appearance is different. Digital ISO noise is related to the size of each pixel, as the noise is per-pixel (so the more pixels you have, the less obvious noise is when viewed the same size), whereas with film, the noise is per crystal ...



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