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Full-size photo on computer

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Steph58. Posted messages 1952 Registration date   Status Member Last intervention   -  
brucine Posted messages 25317 Registration date   Status Member Last intervention   -
Hello, I would like to know how it happens that when you have a 64MP photo (from my phone, and I transferred it to my computer) you cannot view it at 100% in good quality. When I open it, it shows 9%; if I zoom in a bit to 20% it’s fine, we can say. I’d like to open it and then view it at real size (by zooming, I imagine). It’s a basic image viewer on Windows 10 4K. If it’s 4K, the computer should be able to enlarge these 64MP photos, right? Thanks for your help.

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  1.
    brucine Posted messages 25317 Registration date   Status Member Last intervention   4 194
     
    Hello,

    I’m having trouble following: the larger photos I’ve transferred from a phone are around 5 MB for 12 million pixels; the overall size will also depend on the color depth in bits and the resolution, hence the screen size.

    But 64 million pixels???

    If that’s the case, the image won’t be too small but too large for the screen, and knowing that a certain number of basic image editing applications (for example Paint) don’t know how to fit the image to the screen.

    Whether the screen is 4K or not has nothing to do with it; it can, if anything, distinguish existing pixels in the source but not create new ones (as when you enlarge an image that doesn’t have enough pixels).

    What happens when you open the image in question in the browser?

    If it exceeds the screen because it’s too large, you will then have to reduce it by a percentage while preserving the proportions with an image editing software.
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    1. Steph58. Posted messages 1952 Registration date   Status Member Last intervention   114
       

      supposedly for smartphones there is pixel binning. and the sensor size, the aperture, ... are not worthy of excellent quality

      do you know pixel binning? (4 that combine into 1 pixel .apparently )

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      1. brucine Posted messages 25317 Registration date   Status Member Last intervention   4 194 > Steph58. Posted messages 1952 Registration date   Status Member Last intervention  
         

        No matter how much technical jargon we invoke, which actually only applies to smartphones that embed this technology, at best it will improve image quality by interpolation, but it will not change the sensor itself.

        There is no such thing as an actual size of this image, only one corresponding to a determined surface (sheet of paper, screen).

        On a PC, at the same resolution and with a fixed number of original pixels, the image will be less sharp the larger the screen is; its display size on the screen will also depend on what is displaying it (browser, image software...), and it will be less sharp the more I enlarge it because that does not create new pixels.

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  2. fabul Posted messages 42300 Registration date   Status Moderator Last intervention   6 093
     

    Hi,

    64MP no, I think zooming to 1:1 only shows a small part of the image on a 3840x2160 screen

    Besides Photos I use (by default) FastPictureViewer (Gray Legacy 64 Bit version)

    The wheel scrolls through photos

    Left click on the image zooms to 1:1

    And right click is configurable, 300%, 400%, etc.

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    1. Steph58. Posted messages 1952 Registration date   Status Member Last intervention   114
       

      yes I know very well that we only see part of the image but you can shift it with the mouse.

      And on a smartphone the ISO, shutter speed and aperture options are not accessible (so-called).

      but I think it’s the RAW photos that are editable and that can be processed as we want

      do you know apps for the RAW format?

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