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Line 23: == Difference from a lack of artifacts == A perceptually lossless compression is always free of [[compression artifacts]], but the inverse is not true: it is possible for a compressor to produce a natural-looking image with altered contents. Such a confusion is widely present in the field of [[radiology]] (specifically for the study of [[diagnostically acceptable irreversible compression]]), where "visually lossless" is taken to mean anywhere from artifact-free<ref>{{cite journal \|author=European Society of Radiology \|title=Usability of irreversible image compression in radiological imaging. A position paper by the European Society of Radiology (ESR) \|journal=Insights into Imaging \|date=April 2011 \|volume=2 \|issue=2 \|pages=103–115 \|doi=10.1007/s13244-011-0071-x \|doi-access=free \|pmid=22347940 \|pmc=3259360}}</ref> to being indistinguishable on a side-to-side view.,<ref>{{cite journal \|last1=Kim \|first1=Kil Joong \|last2=Kim \|first2=Bohyoung \|last3=Lee \|first3=Kyoung Ho \|last4=Mantiuk \|first4=Rafal \|last5=Richter \|first5=Thomas \|last6=Kang \|first6=Heung Sik \|title=Use of Image Features in Predicting Visually Lossless Thresholds of JPEG2000 Compressed Body CT Images: Initial Trial \|journal=Radiology \|date=September 2013 \|volume=268 \|issue=3 \|pages=710–718 \|doi=10.1148/radiol.13122015\|doi-access=free }}</ref> neither being as stringent as the current "flicker" definition. ==See also==

Transparency (data compression): Difference between revisions