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Details about bit allocation (using the Rate-Distortion optimization procedure).
Note to readers : Upon publishing our review, we received a large amount of email concerning our perceived bias towards Genuine Fractals. In actuality, we try our best to keep our reviews free of bias, therefore, an addendum has been added to this review to clear up any problems or misunderstandings that our readers may have encountered. Please read our addendum for full details...
In other words, use the right tool for the right job. And for this situation, ImageMagick is not the right tool.
The quality of a compression method often is measured by the Peak signal-to-noise ratio . It measures the amount of noise introduced through a lossy compression of the image, however, the subjective judgment of the viewer also is regarded as an important measure, perhaps, being the most important measure.