What is the best format to use to make clean looking thumbnails when they are enlarged on the web?

  • 2
    You can not. It is the other way. From a good picture you do the miniature.
    – Rafael
    May 19 '15 at 3:11

Thumbnails on the web are not the original image. Or at least they shouldn't be. You do not "enlarge" thumbnails to create full version images. You work the other way around.

Start with a large higher resolution image, then crop or resize to create the thumbnail image.

You should always work high quality to low quality, not the other way around.


Images will always be constrained to pixels per inch, so it is important to take into consideration screen sizes to screen resolution in determining how large your images will appear on various devices and the quality they will be displayed at.

  • High definition: 600 pixels per inch (ppi)
    Standard definition: 300ppi
    Medium-Low res: 150ppi
    Low res: 72ppi
  • Web images do not use PPI. See here: graphicdesign.stackexchange.com/questions/13777/…
    – Scott
    May 19 '15 at 4:18
  • No... they do. Because the eyes can see a limited number of pixels per inch. Thanks for -1ing an answer I gave him that is way better than one you could. Compare 72ppi vs 300ppi in a Google image search result and you'll see the difference.
    – Michael d
    May 19 '15 at 4:22
  • Nope.. read the link I posted. You are incorrect.
    – Scott
    May 19 '15 at 4:25
  • Dude people like you disgust me and make this place a ghosttown. People like me walk away and don't post. A 10" Screen width that is 1000x800 pixels will display a 100x100px image as 1". It will display the image as 100pixels per inch. I read the thread you linked. YOU READ IT BACKWARDS. A 100pixel image won't always display as 1".
    – Michael d
    May 19 '15 at 4:30
  • 1
    You should read a bit more carefully. I wrote that so it's exceptionally unlikely that "I read it backwards." seeing as it's my post to begin with. Nowhere does it say anything about 1". Clearly you read incorrectly. And any personal attacks are pretty unwarranted. Professionals should be able to discuss matters without getting so riled up.
    – Scott
    May 19 '15 at 5:00

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