Image of Metal on El Capitan preview page on Apple's website has GIF compression artifacts

Discussion in 'OS X El Capitan (10.11)' started by poiihy, Jul 2, 2015.

  1. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #1
    I was looking through the preview page (https://www.apple.com/osx/elcapitan-preview/) and glanced at the image about Metal and the improved graphics performance, and noticed it had some GIF compression artifacts.

    https://www.apple.com/osx/elcapitan...view/performance/improvements/image_large.png

    So I looked back and looked at the other images, and some images are crisp and perfect with no artifacts, while other images are ugly and dirty with GIF compression artifacts.

    I wonder why it would have GIF artifacts when it is in PNG format. They probably converted it or saved it originally as GIF and then converted it to PNG.

    How ironic, the image about the state-of-the-art Metal graphics has poor quality!

    Here's a piece of the image:
    Screen Shot 2015-07-02 at 12.51.45 PM.png

    Notice the GIF artifacts? You can especially see it in the sky in the first thumbnail where that woman is sitting on a horse.
     
  2. mpfuchs macrumors regular

    mpfuchs

    Joined:
    Sep 19, 2014
    Location:
    VA
    #2
    I don't see what you're talking about... It's way too small for me to make anything out.
    But there is the same screenshot of Photos on Apples page if you scroll back up a little bit from the Metal info.
    Do you see it there too?
     
  3. poiihy thread starter macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #3
    Here it is:
    https://www.apple.com/osx/elcapitan...iew/overview/photos/locations/image_large.png
    No, there is no GIF compression artifacts there.
    Here's a cutout:
    Screen Shot 2015-07-02 at 1.31.53 PM.png

    There are, however, GIF artifacts on this screenshot of Photos, though with different photos:
    https://www.apple.com/osx/elcapitan...ew/overview/notes/attachments/image_large.png
     
  4. mpfuchs macrumors regular

    mpfuchs

    Joined:
    Sep 19, 2014
    Location:
    VA
    #4
    Yes, I see it on two of those pics. In the blue...

    Have to add, I'm on a retina screen now.
     
  5. poiihy thread starter macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #5
    Screen Shot 2015-07-02 at 2.18.46 PM.png Screen Shot 2015-07-02 at 2.18.50 PM.png
    The one on the left is from the image of Metal, and the one on the right is from the other image.
    The one on the left has GIF compression artifacts and the one on the right doesn't.
     
  6. KALLT macrumors 601

    Joined:
    Sep 23, 2008
    #6
    ... So? It's a promotional web image with compression artifacts. I don't see the problem.
     
  7. Mr. Retrofire macrumors 601

    Mr. Retrofire

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    Location:
    www.emiliana.cl/en
    #7
    The Photoshop "Save for Web" option can export optimized PNG images with <= 256 colors. This should not happen, if they use the correct web publishing settings.
     
  8. Mr. Retrofire macrumors 601

    Mr. Retrofire

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    #8
    @KALLT: If it has artifacts, it is not really "promotional". :eek:
     
  9. KALLT macrumors 601

    Joined:
    Sep 23, 2008
    #9
    Nonsense and it depends on what they are promoting. Most people will not notice this and even if they do, they will accept that it's a compressed image for shorter loading times and less data usage, like everywhere else on the web. It's just an illustration of a feature, actually not even a good one as the core end-user benefit of Metal is graphics performance.
     
  10. luke lau macrumors regular

    luke lau

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    Jan 25, 2015
    Location:
    Belfast
    #10
    How do you know it's gif compression and not just general, save-to-web compression?
     
  11. ErikGrim macrumors 68040

    ErikGrim

    Joined:
    Jun 20, 2003
    Location:
    Brisbane, Australia
    #11
    Because reducing colours in a PNG image is an effective and common way of optimising images for web. This image is 168Kb. The same image saved out in 24-bit is 430Kb. I estimate that the full colour image saved as 24bit PNG would be at least four times that size again.

    I could go into further detail if you wish, but suffice to say you were probably the only person that noticed. And that's weighed against keeping the payload of the page down so it loads faster, especially on mobile. Pretty much a no-brainer.
     
  12. crjackson2134 macrumors 68040

    crjackson2134

    Joined:
    Mar 6, 2013
    Location:
    Charlotte, NC
    #12
    I can see it easily. That said, would you want people complaining about how slow Apple's own website responds, or about a few artifacts. They're really inconsequential and not representative of the abilities of Metal.
     

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