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How much space does one 4K picture take?

Question's in the title, thanks guys

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a 4k picture is only 8 mega pixels

so not much <10MB

 

 

 

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It can really range depending on file format, quality, and what's in the picture. (A picture of something is going to take up more space than a solid colour would)

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1 minute ago, Arty said:

a 4k picture is only 8 mega pixels

so not much <10MB

Depends on the context.

Maybe 10mb from a standard camera and compressed.

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Depends if it is Raw. 

ƆԀ S₱▓Ɇ▓cs: i7 6ʇɥפᴉƎ00K (4.4ghz), Asus DeLuxe X99A II, GT҉X҉1҉0҉8҉0 Zotac Amp ExTrꍟꎭe),Si6F4Gb D???????r PlatinUm, EVGA G2 Sǝʌǝᘉ5ᙣᙍᖇᓎᙎᗅᖶt, Phanteks Enthoo Primo, 3TB WD Black, 500gb 850 Evo, H100iGeeTeeX, Windows 10, K70 R̸̢̡̭͍͕̱̭̟̩̀̀̃́̃͒̈́̈́͑̑́̆͘͜ͅG̶̦̬͊́B̸͈̝̖͗̈́, G502, HyperX Cloud 2s, Asus MX34. פN∩SW∀S 960 EVO

Just keeping this here as a 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Depends on the format and if it's compressed. A 24-bit uncompressed BMP, for instance, would take at least (24/8) * 3840 * 2160 bytes or about 24.9MB. However, if you use something like a compressed JPG, it could be around 7-9MB depending on the content. If you're working with videos, then only key frames will store a complete frame.

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And if you are taking a RAW file from something like a DSLR, it could be much larger than the BMP.  Possibly in the range of (3*14/8) * 3840 * 2160 = 41.5 MB, though most DSLRs are actually much higher resolution, but offer lossless compression (for example a 24 MP RAW on our camera is typically around 30 MB)

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8 hours ago, Ryan_Vickers said:

And if you are taking a RAW file from something like a DSLR, it could be much larger than the BMP.  Possibly in the range of (3*14/8) * 3840 * 2160 = 41.5 MB, though most DSLRs are actually much higher resolution, but offer lossless compression (for example a 24 MP RAW on our camera is typically around 30 MB)

Actually it is just (14/8)*3840*2160=14.5MB since RAWs are not demosaic and thus contain one channel.

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6 hours ago, .spider. said:

Actually it is just (14/8)*3840*2160=14.5MB since RAWs are not demosaic and thus contain one channel.

Wait... so when they say 14 bit, that's per pixel, not per channel?  Then how do they have so much more dynamic range than something that's 24 bits per pixel (8 bit per channel)?

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54 minutes ago, Ryan_Vickers said:

Wait... so when they say 14 bit, that's per pixel, not per channel?  Then how do they have so much more dynamic range than something that's 24 bits per pixel (8 bit per channel)?

There are "no channels" the sensor has x pixels and 50% of these pixels are sensitive to green, 25% to blue and 25% to red.

Luma resolution is still 14bit, only the spatial color resolution is much lower than the "sensor's resolution". 

 

(pictures should be zoomed, in a proper image viewer)

XiIuq4f.png

This is what the camera sees and saves (converted to 8bit and RGB)

 

9SSEZON.png

This is what you get after demosaicing the image. "Real RGB"

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3 minutes ago, .spider. said:

There are "no channels" the sensor has x pixels and 50% of these pixels are sensitive to green, 25% to blue and 25% to red.

Luma resolution is still 14bit, only the spatial color resolution is much lower than the "sensor's resolution". 

 

(pictures should be zoomed)

XiIuq4f.png

This is what the camera sees and saves (converted to 8bit and RGB)

 

9SSEZON.png

This is what you get after demosaicing the image

OK so on a 24 MP camera for example, what would be it's "x" value the way you stated it?  It couldn't be 24 million, could it, because then the final image wouldn't be 6000 x 4000

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1 minute ago, Ryan_Vickers said:

OK so on a 24 MP camera for example, what would be it's "x" value the way you stated it?  It couldn't be 24 million, could it, because then the final image wouldn't be 6000 x 4000

x is 24Million 

There are 12 Million pixels sensitive to green and each 6 Million pixels sensitive to red and blue. 

 

The images' spatial luma resolution is 6000*4000 (or close to, depends on the light) the images' spatial chroma resolution is 6000*4000 too, but the chroma resolution is interpolated to 6000*4000 by a process called demosaicing.  

 

 

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1 minute ago, .spider. said:

x is 24Million 

There are 12 Million pixels sensitive to green and each 6 Million pixels sensitive to red and blue. 

 

The images' spatial luma resolution is 6000*4000 (or close to, depends on the light) the images' spatial chroma resolution is 6000*4000 too, but the chroma resolution is interpolated to 6000*4000 by a process called demosaicing.  

 

 

ah ok that all makes sense now, thanks :)

I actually know embarrassingly little about this apparently :P

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