Image::quality() reports 0 on some jpeg

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magick
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Re: Image::quality() reports 0 on some jpeg

Post by magick »

ImageMagick stopped using estimated compression quality for JPEG images because the estimate was sometimes far from the actual compression quality and produced severe artifacts in the resulting image. Current releases of ImageMagick only sets the image quality if it can be computed exactly. You can still get the estimated compression quality with the -debug coder option.
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