# Tagged Questions

step by step procedure to calculate a value

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### Best software for upsampling to about 2x?

I have some high-quality RAW files I've processed (some cropping, contrast adjustment, etc.). I need to have them printable at about twice the size I get with the ppi set to 240. I've been looking ...
70 views

### In working out Auto White Balance, what to do if there are multiple sources of light?

I'm trying to research Auto White Balance Algorithms. These algorithms are defined assuming only one source of light. For example: 1.Grey world assumption ( this assumes that R, G and B average ...
548 views

### What algorithm can I use to simulate bokeh?

I am attempting to write a script that loops through each pixel in a photograph and applies a bokeh to the image as a whole. I built a script based off this link, however that seems to be a hack. I ...
116 views

### algorithm deflickering timelapse shots?

before you ask yes I already saw this subject(What algorithm can be used for deflickering timelapse shots?) The answer of Matt Grum is nearly what I'm looking for but I need more precision and I ...
948 views

### How does 18% exposure algorithm work?

They all say and teach the rule that camera exposes to 18% grey. Then they go and show an example of shooting a white board or black board and they both show as a grey board in the camera. Great, but ...
2k views

### Would a demosaic algorithm for black and white be useful?

Given that the main purpose of demosaicing is to recover colour as accurately as possible, would there be any advantage to a "black and white only" demosaic algorithm? That is, instead of first ...
863 views

### What algorithm can be used for deflickering timelapse shots?

What are deflicker algorithms used to deflicker stills that should be composed to a timelapse movie? (Flickering caused by shutterspeed adjustments in sunset/sunrise shots...)
2k views

### How does “smile shot” work in cameras?

Nowadays some advanced cameras have the feature of "smile shot" without the photographer pressing the shutter. How do the cameras achieve this? How does it recognise the smile?
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### Does the curves tool in Photoshop (or any software) do anti-aliasing?

I'm not talking about drawing smooth curves here, but rather the curves tool used for adjusting color levels. An illustration will be worth a thousand words, here. This is an adjustment in Gimp: ...
385 views

### How to understand the definition of dynamic range?

I have the following formula: DR=(1.4L_Sat G_i)/N_D where DR is the dynamic range; L_sat is the luminance at the “margin level”，70.1% of the maximum recordable （saturation）luminance（yes，L_sat is ...
290 views

### some criteria when a filter looks good

I'm a developer who wants to figure out when a filter would look good applied to a given image. For example, I have sepia, solarisation and pencil filters. Okay, the perception will be very ...
159 views

### Learning about photography algorithms [closed]

I'm very interested in learning about algorithms in photography (in particular processing photos). In addition to algorithms, I'm interested in learning about photo formats (probably RAW and jpeg the ...