really need High-DPI (retina) images ?

  • Resolved arioman

    (@arioman)


    9 years, 10 months ago

    Most of new themes have a featured that enable in default call High-DPI or Retina

    i Google it and some article about it but really don’t understand why we need this really

    in small images for example width & height 300×181 it`s not a big deal to create 4 smaller size of this pic on server

    but when i have some HD images with 1920 * 1280 pixels it will be different , see this example ;

    my original photo 1920*1280 : 428 KB
    ********and here what copy of this image created after upload ***
    WPUEDUWF-77×77 : 3KB
    WPUEDUWF-150×150 : 8KB
    WPUEDUWF-154×154 8 KB
    WPUEDUWF-300×200 14.9 KB
    WPUEDUWF-468×312 18 KB
    WPUEDUWF-936×624 86 KB
    WPUEDUWF-1024×682 101 KB

    So when i have many images on my server these Kbytes will be take a lot of space after a while

    ////////////////////////////////////////////////////////////////
    So the Question is what these extra size of images doing ? what happened if we disable Retina at all , what we lose ?

Viewing 3 replies - 1 through 3 (of 3 total)
  • Moderator James Huff

    (@macmanx)

    Many folks are getting new computers and mobile devices with HiDPI (Retina) screens, this means that the pixels are both smaller and packed closer together.

    In the old days, you’d always know how big the image would be if you set it to be 300 pixels wide, but HiDPI screens have twice the pixel density, thus posing the problem of needing to adapt for HiDPI screens.

    An image which appears to be 300 pixels wide on a standard screen will either appear the equivalent of only 150 pixels wide (half the size) on a HiDPI screen or still 300 pixels wide and blurry as if it were doubled in size past its original size.

    So, if you want to set an image to be 300 pixels wide, that’s perfectly fine, but make sure it’s actually 600 pixels wide. Standard screens will see a crisp down-scaled image in a 300 pixel space, and HiDPI screens will see the original crisp 600 pixel image in the same “300 pixel” space (because they have twice the pixel density).

    To put it bluntly, HiDPI screens are incredibly crisp and like candy to the eyes, until they run into images which have not been adapted for them, then they look like a blurry mess.

    So, why should you care? Because the adoption rate of HiDP screens are going through the roof. Most laptops over $1,000 (and some for less) include a HiDPI display, most tablets do, almost every smart phone does, and even the Apple Watch will. As a result, most site have adapted to support HiDPI imagery. So, if you don’t, then you’re just one of the few sites that looks awful to anyone with a HiDPI screen.

    So, what can you do about it? If you’re using the Jetpack plugin https://www.ads-software.com/plugins/jetpack/ just switch on the Photon module, which automatically adapts your images to the viewer’s screen type (provided the original is large enough). If you’re not using Jetpack, try this plugin: https://www.ads-software.com/plugins/wp-retina-2x/

    Thread Starter arioman

    (@arioman)

    thanks so much for spend time and explain really nice for me

    Moderator James Huff

    (@macmanx)

    You’re welcome!

Viewing 3 replies - 1 through 3 (of 3 total)
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