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KatyDew
Participant
August 16, 2015
해결됨

Display a Picture on a TV

  • August 16, 2015
  • 3 답변들
  • 62650 조회

I am struggling with IMAGE SIZE on Photoshop when preparing a photo for a TV.

I think that I understand that a TV displays 1:1 (ie. one pixel from my image is one pixel on the TV).   I think I understand that 1080i TV displays 1920w x 1080h pixels or  approximately 2K pixels while a 4k TV will display 3840w x 2160h pixels.    I think I understand that the size of the TV does not affect the number of pixels, ie a 15" 1080i TV displays the same number of pixels as a 60" 1080i TV, they pixels are simply smaller on a 15" than on a 60". 

I want to plan for the largest, best quality TV with my pictures so I let's say that I am planning to display my pictures on a 60" 4k TV.   I am trying to figure out the best settings in the But I don't understand the settings in the IMAGE SIZE box.   I assume that I would set the PIXEL DIMENSIONS to  3840 Width and 2160 Height.   This appears to automatically make the DOCUMENT SIZE 53.333 inches width by 30 inches Height.    I assume that I set the Resolution to 72 Pixels/Inch BUT I DON'T UNDERSTAND WHY.   

When I save the document as a JPEG I don't understand what the IMAGE OPTION will do.   If I set QUALITY to 12 (Maximum) the file size ends up 3,718 KB, if I set it to 0 (minimum) the size is 344 KB (a dramatic difference). 

So, my questions are:

1) Are my assumptions above correct?

2) What should the RESOLUTION be in the IMAGE SIZE and why?   If 72 dpi, why since TV's are 1:1 and not dots in an inch?

3) What should the QUALITY setting be in the JPEG IMAGE OPTION box and what affect will Minimum and Maximum have on the picture quality displayed on the TV?

Thanks,

    최고의 답변: JJMack

    All I did was answer the questions posed. I don't think I said anything about making a video-did I? But I think you'll find 1080i counts as a video format and that's what the question concerned. The end use if I may say so is kind of obvious


    Yes there are many video formats and many TV standards. However the OP clearly stated they wanted to display their images on a 60" 4K HDTV.  Which means they want to use their TV more like a Display then for broadcast video. They know that a 4k Display regardless of size display 3840x2160 Pixel. They should save their images croped to this 16: aspect ratio with best image quality the can with 3840x2160 pixel.   It not hard to do for Landscape images and horizontal panorama.  However it is difficult to do for Portraits. For a Portrait cropped to a 16:9 aspect ration composition will not be acceptable,  They they need to display Landscape images only. If they want to display their portrait images it would be best to fit them into the 3840x2160 area and display them with boarder on the left and right side of the image.

    3 답변

    F
    faerieb89595307
    Participating Frequently
    September 12, 2018

    Hello, I am new to this forum, and not even sure how to make a thread. Anyways, I was searching the internet on a certain subject and I stumbled upon this thread. So I created an account here so I can ask a question. I thought maybe you could help me? I create themes for Google as a hobby. Meaning, that I upload images and make backgrounds for the google browser for people to decorate google interface. Here is a link to my page to give you a better idea of that I do: F a e r i e B o o t s - ThemeBeta 

    People tell me they love my work, but they can see white lines around the image I use. I work from a large screen  television and the people that are telling me this I assume are on a monitor.(?) My question is : What size image should I use so all viewers ( On a monitor or television) don't see the white lines on either side of the image? I download many images off wallpaper sites.and I pick the size 1920 X 1080 which is the standard size for a monitor, and it looks fine on my television screen when I create the theme. I tell people that it depends on their computer and browser settings which determine what they see. Is this correct?  Can you please explain to me if you know in simple terms how I can fix this? i would really appreciate it.

    JJMack
    Community Expert
    JJMackCommunity Expert
    Community Expert
    September 12, 2018

    1920x1080 is the 1k HDTV display image size.  They will most likely be a good size for Web browser applications.  Not the best for 4k HDTV slide shows.

    Your issue seem to be that user tell you they see white fringe areas in your composite images that you do not see.  You need to post some example images that user tell you have white fringe problems.  If we see your images have problems we may be able to advise you on ways to improve your images processing.   Are you right the image are good or are the users right there are white fringe problems?

    JJMack
      F
      faerieb89595307
      Participating Frequently
      September 14, 2018

      Hello and thank you for responding to me. After I had written you I realized that I had responded to an old post and thought that the chances of getting a response was minimal. I am so pleased to see that you responded. I have inserted the first image which is a 1920X1080 size that I was told by one person that had the fringes.

      Here is another image that I was told that had the fringe problems: I realized that this image is much larger it is 3840X2160. I usually size down images to the standard 1920X1080 when I make themes, but in this case I did not. I assume there shouldn't be clipping with this one because it is much larger?  I would like to add that Themebeta automatically sizes the image when you create the theme you can see that next to the tags on the theme information on my profile on any of my themes. Am I missing something? I notice that some people make themes that are 2560X1440 that do not get automatically sized by Themebeta and I think are 4 k or high def ? Anyways, I tell you this because I wonder how those images are not being "automatically" sized by theme beta...  Like this for example:

      The Isle HD 2560x1440 Chrome Theme - ThemeBeta


      So there you go, and again thank you so much for taking the time to answer my question and helping me out. I really appreciate it. It's a bit frustrating, because I studied digital media in college years ago, and image size is one of the very first thing you learn. After time, I start to forget and doubt myself as far as my knowledge goes.... Thanks again, and have a nice day.

      Faerie Boots.

      Terri Stevens
      Terri Stevens
      Legend
      August 16, 2015

      Hello a really interesting question

      First I'm not a video expert, but I do know 1080i isn't 1920x1080 because the image on screen is created by displaying two fields in quick succession. The first will be 1920x540 and start at line 1 then, 3,5,7,9 etc Then the second field again 1920x540 will fill in the blank lines 2,4,6,8 etc This is called interlacing and happens so quickly you don't generally see it. An image at 1920x1080 is called 1080p and is just a single frame image , but doesn't have the potential to flicker as does 1080i. Having said that the TV doesn't use all the lines of the screen for the image-some are reserved for housekeeping. I  think the pixels are both smaller and closer together on a small screen which makes the picture look better. As just said the DPI is irrelevant here so leave it a 72dpi and save at 3840 Width and 2160 for a 4K television to be displayed as progressive. The file size sounds about right for a jpeg at maximum quality-which you should use, but might need to be reduced if you are streaming to the TV set.

      Terri

        JJMack
        Community Expert
        JJMackCommunity Expert
        Community Expert
        August 16, 2015

        I do not think the OP wants to do anything with video.  They most likely are not going to be burning a DVD or CD with video on it.  Most HDTV these days are connected  to ones home network they are smart TV or have Roku, Chromscast, AppletTV,  or a game console like Wii u, Playstation or Xbox. Which enables you to user your TV as a digital image frame.  They just want to create Jpeg files to display great slide shows on their TV.  All that matters is the number of Pixels and Image quality. Most likely full Image are going to be streamed to or read by the tv via usb, wireless connection or network cable..

        JJMack
        Terri Stevens
        Terri Stevens
        Legend
        August 16, 2015

        All I did was answer the questions posed. I don't think I said anything about making a video-did I? But I think you'll find 1080i counts as a video format and that's what the question concerned. The end use if I may say so is kind of obvious

          JJMack
          Community Expert
          JJMackCommunity Expert
          Community Expert
          August 16, 2015

          The DPI setting an image file has in meaningless when it comes to displays, It does not matter if it was 1 DPI or 1,000DPI.  Displays do not use that setting they display their fixed size pixels what matters is the number of Pixel you have.  If you do not have as many pixels that your display displays the image viewer application or firmware will need to scale the image up in size to fill you displays pixels.  If you have more pixels then the display displays  the image viewer  or firmware has to scale the image down in size so the whole image will be displays.  If the image aspect ratio is not the same as you display there will be boarders on two sides of the image displayed on the left and right or top and bottom.

          Displays have a fixed DIP or PPI what ever you care to use. Small screens have a higher ppi resolutions then large display that display the same number of pixels  The only time you notice a the sesolution is when you close to the tv display and your eyes can resolve down to the displays pixel size.   Small  hdtv display display a smaller sharper high resolution image where large hdtv display larger lower resolution image.  You can see the image on a 1080p 65" display twenty feet away better then you cand see the exact same image on an 8" tablet 20 feet away.

          JJMack
          Barnabylad
          Barnabylad
          Participant
          February 3, 2020

          Just picked up this thread, and I have question. Is it better to use a .jpg or a .tif file to show photos on a 55" HD Television?

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