Tenger Plugin: sharpen
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Sharpen Resized Images
Do you realize your resized images looks blur? This plugin fixing it. Sharpening resized jpg image uploads in your WordPress.
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ImageMagick Sharpen Resized Images
Improve your images: Sharpens resized JPG image uploads via ImageMagick so it keeps quality, EXIF information, color profiles and crops.
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WPSSO Tune WP Image Editors
Improves the appearance of WordPress images for better click through rates from social and search sites.