Featured image

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  g1ll1an · Member · Dec 17, 2011 at 6:57 am

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  I have just started having problems with setting a featured image on an individual post. It shows on the draft screen at the bottom of the post, but when it is previewed or published it reverts to the generic featured image. As far as I can see I have used the same method as always. Any suggestions?

  The blog I need help with is: (visible only to logged in users)

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  panaghiotisadam · Member · Dec 17, 2011 at 7:29 am

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  Not without the URL of the blog in question and the image in question.

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  g1ll1an · Member · Dec 17, 2011 at 8:38 am

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  Vincent Square

  I was trying to use a slice of the mosaic picture which is shown at the bottom of the piece as the featured image. I loaded the image twice, gave them different names, cropped one for the feature and left the other to go into the post. This image is much lower resolution than the ones I normally use and I suspect this might be the answer. I tried to use a cropped piece of clipart (jpeg.) and that also didn’t work. I have no problem with my normal photos. Mosaic image was taken by a colleague and sent to me by email hence the lower quality. Thanks for trying to help

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  panaghiotisadam · Member · Dec 17, 2011 at 9:51 am

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  Your suspicion is correct, only it’s the pixel dimensions that matter, not the resolution. See this post of mine:
  http://wpbtips.wordpress.com/2011/10/21/on-the-recent-featured-image-issues/

  As for resolution and dimensions in general, browsers display images at 72, so there’s no point uploading high resolution images, and there’s no point uploading 3000px wide images when your theme displays them at 940: you’re simply wasting your storage space and increasing the loading time of your pages. Ideally you should use an image editing application or an online tool to resize copies of your images to a resolution of 72 and the exact required pixel dimensions, and upload and insert those copies. This way you get better quality as well, because images downsized by WP lose some color and sharpness – see here:

  Image quality

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  g1ll1an · Member · Dec 17, 2011 at 1:59 pm

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  Many thanks for your help. Not sure I understand the detail of what you are talking about,but I will follow your links and play around with my images and then I am sure it will all make sense.

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  panaghiotisadam · Member · Dec 17, 2011 at 3:00 pm

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  You’re welcome. The gist is that featured images in Twenty Ten must be 940×198 pixels (or larger). Smaller ones won’t show up, larger ones will be cropped (except if in the same aspect ratio).

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  g1ll1an · Member · Dec 17, 2011 at 3:44 pm

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  I have just resized photographs for a posting to 640 wide which is the maximum for twenty ten format and it certainly takes a lot less time to load up the photos. And now that I understand about the minimum size for the featured image it all makes more sense. Once again many thanks for your help

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  g1ll1an · Member · Dec 17, 2011 at 3:56 pm

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  And although I didn’t think that it would work, I have resized the mosaic image to make it bigger (which somehow doesn’t make sense but it worked) and it is now the featured image on today’s posting.