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ChapterThemes says

I have a mystery over here.

For some reason, a WordPress site is generating really low quality thumbnails. They look like a JPG with quality 20 or a GIF file with only a couple of colors with some dithering.

I’ve tested the original images and there’s nothing wrong with them since their thumbs on a different WordPress site look good.

It’s also no CSS or anything since when i save the generated thumb the low quality is in the image itself.

I’ve searched the internet and found some threads but none with a clear answer and some which where caused by some weird CSS rule.

What could be the problem here?

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Coffee-Themes says

If i remember there is filter for quality of thumbnails, check this post here: http://wordpress.org/support/topic/setting-jpeg_quality

Start there, maybe somewhere in plugin or theme someone mess with it.

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ChapterThemes says

Allready tried that. The site has nog weird plugins or whatever.

Could it be a server/php related thing?

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UBLThemes says

Allready tried that. The site has nog weird plugins or whatever. Could it be a server/php related thing?

Have you checked the server info?

If it’s an old server the image GD Library might need updating

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