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What Does "1:1 Crop" Mean?


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#1 MarkM

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Posted 11 October 2017 - 06:37 PM

I guess I don't actually understand the phrase "__% crop" (for instance, "100% crop")

 

I was watching a YouTube video: "Nikkor 200-500mm f 5.6 - Is It Sharp?" (sorry, having trouble pasting the URL).  The reviewer showed several bird photos at "1920x1080 1:1 crop" (screenshot example attached). 

1.  What does 1:1 crop mean?  Does that mean a 100% zoom of the original, i.e. the cropped image (bird in this case) is 2x the size of the bird in the original out of camera? 

2.  What is special about 1920x1080? Is this some kind of standard?  (I recognize 1080 as a number describing television monitors)

 

Thanks!

 

 

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#2 elcab18

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Posted 12 October 2017 - 08:48 AM

I think the term 1:1 means that a single pixel in the image is represented by a single pixel on the viewing monitor which to me seems like an extreme crop but maybe necessary in some applications.  A 24 mp file is about 6000 x 4000 pixels, monitors to my knowledge are no where near that so to achieve 1:1 it would be an extreme zoom in, I'm just a dummy though, my 2 cents :huh:


https://photo.stacke...hat-is-100-crop


Can be a bit confusing...


http://www.birdsasar...-arthur-morris/

 

Scroll down near the bottom, seems to be a pretty good explanation, you woke up my curiosity Mark!



#3 TrailEx

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Posted 12 October 2017 - 08:52 AM

Elcab, you are exactly right. 1:1 crop does mean one image pixel is represented by one pixel on the viewing screen. 1920 x 1080 is the dimension of an HD video, so there was no compression of pixels in that image, even when it was converted into a video. Usually nobody crops to that extreme level except to show that X lens is or isn't sharp. This is the definition of pixel peeping!


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#4 MarkM

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Posted 12 October 2017 - 08:21 PM

That is the best explanation I have found!  Thanks guys

 

So, would "2:1" mean that for every 2 pixels in the original image, there is only 1 pixel on the display?  And therefore the resolution on the display has been reduced?  When I go into LR and select some of the options, the higher I go (like 3:1, or 4:1) the more cropping there is, but the resolution is less and less






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