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HD image enlargement 1920x1080

Naej -  
Armojax Posted messages 1863 Registration date   Status Member Last intervention   -
Hello everyone!

My situation is quite simple, I would like to get some information on the possibilities of enlarging an image in high definition, with a resolution of 1920 by 1080 pixels.
I would like to make a poster, as big as possible! Quality loss is definitely the enemy number one in this case, so how far can I go with the dimensions while keeping the image "decent"? If anyone has tried this or has any information/ideas to offer, feel free to share! :)
Thanks in advance!

Configuration: Windows XP / Internet Explorer 8.0

2 answers

  1.
    Armojax Posted messages 1863 Registration date   Status Member Last intervention   1 529
     
    Re Naej,

    Your enthusiasm is pleasing to see!

    With 58 pixels/cm, your image will still have good qualities. It's about 150 DPI instead of 300, but it will still be perfectly fine if you don't get too close to it.

    You still need to correct a few mistakes ;-)):

    - your image will always retain its pixel count: 1920 x 1080. It’s only by representing them as larger color spots that the image becomes larger.

    "... And I can’t even imagine at 300 DPI then..."

    - like many people, you are reasoning backward. In reality, increasing the DPI means representing the pixels with tiny dots, so you fit many more per cm. The result is that the image becomes smaller, not larger.

    I hope your image leaves a good impression on you!

    Armojax.
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  2. Luke1 Posted messages 18751 Registration date   Status Contributor Last intervention   5 435
     
    Hello,

    high definition image, resolution of 1920 by 1080 pixels, then.

    These are ONLY the dimensions of the image and not its resolution. For example, this image http://ioj.com/v/etjt0 is far from being high resolution and yet its dimension is indeed 1920x1080px unfortunately it is only 50 dpi while the minimum acceptable should be 72 for screen display and it still wouldn't be considered high resolution. For printing on paper, a correct resolution is 300dpi, for advertising prints that do not require good quality, newspapers, etc. we can go down to 200 or even 150dpi and not lower. The resolution must be indicated in dpi (Dots Per Inch) in addition to the dimensions in pixels...
    Just for your information, a bit of reading on resolution https://fr.wikipedia.org/wiki/R%C3%A9solution_%28imagerie_num%C3%A9rique%29 ...

    Luke.

    --
    Yesterday is behind, tomorrow is a mystery, and today is a gift, that's why we call it the present.
    (Master Oogway)
    -1
    1. Naej
       
      Oh, okay! It's true that I don't know much about this area, but now I have roughly understood the principle, thank you for this information.
      But then my question is: how can I find out the resolution of my image?
      Note: It’s an image taken from Hebus (http://www.hebus.com/image-270703.html).
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    2. Armojax Posted messages 1863 Registration date   Status Member Last intervention   1 529
       
      Hello Naej,

      You can print your 1920 x 1080 image in any dimensions you want.
      Indeed, when you print an image, each pixel is represented by a square of color. The larger the squares are, the bigger the printed image will be, obviously.

      Resolution is just that: choosing the size of the dots to get the size you want.

      The problem is that when there aren’t enough pixels, you have to enlarge them excessively to get a large image. You can see the square dots, and the quality is not great. So there is a limit, after all.

      Printmakers talk about DPI or PPI (points per inch). For an image meant to be viewed in hand, we usually go for 300 DPI (= about 120 points per cm).

      In the case of your image, if we spread your 1980 pixels in width at 120 per cm, your image will measure about 16.5 cm wide, and it will be great.

      You can print it larger (20 or 25 cm wide), with lower quality, and even larger if you step back to look at it...

      Do you get it?

      Armojax.

      Hi Luke, have a good day.
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    3. The Braveheart Posted messages 4377 Registration date   Status Contributor Last intervention   1 334
       
      Hello Armojax,

      Do you speak?

      Oh Gosh, is that how you speak where you are?

      Best wishes and Sioux Laterre Maille Dire!!!

      THE BRAVEHEART
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    4. Armojax Posted messages 1863 Registration date   Status Member Last intervention   1 529
       
      Hello The Braveheart,

      "... Sioux Laterre Maille Dire!!!"

      Come on, let's turn the Apache and move on!!!

      Best regards too.

      Armojax.
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    5. Naej
       
      Thank you for your additional information, Armojax!
      I just came back from a reprographer where I went to inquire as well.
      He told me, as you did, that we could print in any format, as long as the image meets a certain quality. He mentioned 58 pixels/cm for a "correct" result. (So that makes 145 DPI if my calculations are correct??).
      If I adhere to this constraint, my image should then be 111,360 x 62,640 pixels? lol! Is that possible?
      And I can’t even imagine at 300 DPI then...
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