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JPEG or PNG?

by mariablassingame
14 replies
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In posting pictures, there are websites which choose JPEG and others wants PNG. I question what is the difference between them? When do you use JPEG and PNG?
#jpeg #png
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  • Profile picture of the author tagiscom
    Originally Posted by mariablassingame View Post

    In posting pictures, there are websites which choose JPEG and others wants PNG. I question what is the difference between them? When do you use JPEG and PNG?
    JPEG is more for a standard image, (like a photo) and PNG, is more for stand alone elements, (a black background with a dunce hat for example) that can be taken off and used elsewhere.

    PNG's can also be used for embedding protective scripts to hinder using a copyrighted image, or also used to crash Photoshop, if you are trying to access a certain part of a larger image, (NASA uses that one occasionally, or tries to).

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  • Profile picture of the author manoaratefy
    Originally Posted by mariablassingame View Post

    In posting pictures, there are websites which choose JPEG and others wants PNG. I question what is the difference between them? When do you use JPEG and PNG?
    In a hand, JPEG is lossy compression format. It means that each time your export your picture to JPEG, you will loss some details. Then, JPEG is not for something which need details, like a logo or a button image but these lost details is not enough visible on camera taken pictures. So, go with JPEG when it is a photography.

    In other hands, PNG is a lossless compression format. It means that your picture is 100% reconstituted when your computer load your .png file. So, it's the best for logo, buttons icons and other small graphic on websites. But its compression can't beat JPEG when we talk about photography: when a picture have too much colors and too much pixels, PNG format is too heavy for the web. So, go with PNG when it is a graphic with less colors and less pixels but need precision.
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  • Profile picture of the author LindyUK
    The most important thing in adding photos to websites or posting them to the web (whether they specify file type or not) is file size.

    The larger the file size the slower the image will load on a website.

    We use a brilliant free software application called Quick Photo Resizer that reduces the file size while still maintaining the image quality. Just Google it to download.

    Cheers
    Lindy
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  • Profile picture of the author hardraysnight
    definitely png, especially the star mountains and the barramundi in sepik

    never been to jpeg
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  • Profile picture of the author George Onks
    Good info Thanks.
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  • Profile picture of the author hardraysnight
    is washington like santa fe only spelt different?
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  • Profile picture of the author dvz
    Of course PNG is better because it's lossless.
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    • Profile picture of the author tagiscom
      Originally Posted by dvz View Post

      Of course PNG is better because it's lossless.
      PNG lossless, first time l heard that one, l think that you may be getting that mixed up with an EPS, or illustrator, vector type format, that is lossless.

      Lossless is usually associated with a vector type image or what most people think of characters, or a font.

      I have messed about with turning an image into a vector format, which is black and clear or white, but can go to any scale without loss of integrity.

      PNG may be lossless up to the point of original scale, but a Smart Object is easier to use.

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  • Profile picture of the author cutoutimage
    JPG format is a lossy compressed file format. This makes it useful for storing photographs at a smaller size than a BMP. JPG is a common choice for use on the Web because it is compressed. For storing line drawings, text, and iconic graphics at a smaller file size, GIF or PNG are better choices because they are lossless.

    PNG format is a lossless compression file format, which makes it a common choice for use on the Web. PNG is a good choice for storing line drawings, text, and iconic graphics at a small file size.

    Here are a couple advantages to using PNG:

    Ability to use transparency and or opacity, as opposed to JPG where by default it will retain a white/blank background.
    The use of color palettes. PNG supports 24-bit RGB and 32-bit RGBA colors.
    Grayscale images.
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  • Profile picture of the author outreachpanda
    Png format for logos because it is the only format that supports transparent logos.
    Jpeg 2000 format for adding images in site content. Jpeg is the best format of the website.
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