{"id":11684,"date":"2025-03-14T00:00:11","date_gmt":"2025-03-14T04:00:11","guid":{"rendered":"https:\/\/melindaozel.com\/?p=11684"},"modified":"2025-03-30T20:28:40","modified_gmt":"2025-03-31T00:28:40","slug":"reasons-the-facs-manual-is-not-for-you","status":"publish","type":"post","link":"https:\/\/melindaozel.com\/vi\/reasons-the-facs-manual-is-not-for-you\/","title":{"rendered":"8 D\u1ea5u hi\u1ec7u cho th\u1ea5y S\u1ed5 tay FACS kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi b\u1ea1n"},"content":{"rendered":"\t\t
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Is the FACS Manual worth it?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Whether you’re an artist, researcher, or behavior enthusiast, learning the Facial Action Coding System (FACS) can be a daunting task. Credible FACS resources are hard to find, and when you do find them, they\u2019re most likely not designed to fit your needs.<\/p>\n

To make matters worse, the FACS Manual<\/em> itself has become somewhat dated for many modern use cases. Though action units have been foundational in the development of facial blendshapes and face tracking, if you work in facial animation, AI, or related fields, you probably already know: FACS wasn\u2019t built to help you generate high-fidelity digital humans or achieve photorealistic lipsync. If you\u2019re hesitant to spend $350 on a PDF, here are eight signs you might want to save your money.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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1. You're not trying to become a facial coder.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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The entire FACS Manual <\/em>was created to teach facial coding. Over 45% of the 527-page document is dedicated to the technicalities of when and how to code each action unit. While useful information can be extracted from these specifications, the FACS Manual<\/em>‘s rules are not broadly applicable outside of facial coding. Take the case of nose wrinkler (AU9) vs. brow lowerer (AU4):<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\tSince AU 9 [nose wrinkler] almost always involves some brow lowering, you cannot score 4+9 [brow lowerer + nose wrinkler] unless you also see evidence that the eyebrows have been pulled together by 4 [brow lowerer], or if they act sequentially so their independent action can be seen.\t\t\t<\/p>\n\t\t\t\t\t<\/blockquote>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t

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For machine learning purposes, ignoring a brow lowerer just because it frequently co-occurs with a nose wrinkler introduces inconsistency and confusion. Given that brow lowerer is caused by muscles separate from nose wrinkler, this rule is confusing from an anatomical standpoint as well.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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2. You need facial expression references from different angles.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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All reference photos in the FACS Manual<\/em> are front-facing. There are no profile or 3\/4-view images. Varied angles are critical for real-world applications \u2013 e.g. 3D character design, blendshape development, expression tracking, AI, etc.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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3. You want to see how faces move.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Example of the FACS Manual's video add-on quality<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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With the exception of a bundled add-on of devastatingly pixelated videos, all\u00a0FACS Manual<\/em>\u00a0references are static images. The ability to see movement is an absolute MUST when learning about facial expressions. This need applies to all disciplines.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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4. You enjoy color.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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In both a literal and figurative sense, the\u00a0FACS Manual<\/em>\u00a0is devoid of color (unless you count the red decals on the cover page). All\u00a0Manual<\/em>\u00a0reference images are black-and-white. The accompanying videos are also black-and-white.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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5. You want to observe expressions on diverse faces.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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The expression models in the\u00a0FACS<\/em> Manual<\/em>\u00a0are primarily white and fall within a narrow age range. Having a diverse set of references is critical for learning and understanding how faces work. If you\u2019ve only seen examples of\u00a0lip tightener\u00a0<\/em>on thin-lipped, 20-to-50-year-olds, you will have a much harder time deciphering\u00a0lip tightener<\/em>\u00a0on someone with fuller lips or someone with highly aged lips. Similarly, if every brow raise example you’ve seen features full horizontal wrinkles, when you come across column-shaped wrinkles<\/strong><\/a>, will you mistakenly code an AU2 when you should really code a 1+2?<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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6. You care about facial muscles and underlying anatomy.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Though the\u00a0Manual<\/em>\u00a0does allude to various facial muscle properties, there is not one mention of a muscle name in the entire PDF. Only in the\u00a0Investigator\u2019s Guide<\/em>\u00a0can you find words like \u201czygomaticus major,\u201d \u201cfrontalis,\u201d or \u201corbicularis oris.\u201d Learning facial muscle fundamentals is a key component for facial expression comprehension. Knowing which muscles are tied to which action unit(s) is beyond helpful. Awareness of facial muscle names opens you up to a whole new world of reference material through Google searches.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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7. You need to study facial movement at the highest level of detail.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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If you want to see how facial blood flow changes during extreme muscle contractions or how skin deforms under strain, don\u2019t expect the FACS Manual<\/em> to help. The most recent version of the Manual <\/em>was published over 20 years ago. Its content (i.e. pixelated videos and black-and-white photos) may have been sufficient at the time, but our bar for visual quality has changed significantly over the last two decades.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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\u00a08. You're looking for a fun and engaging learning experience.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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One of the most common complaints from people seeking help beyond the\u00a0FACS Manual\u00a0<\/em>is: the\u00a0Manual<\/em>\u00a0is \u201ctoo dry.\u201d For its intended purpose (teaching researchers how to facial code for behavioral studies), the\u00a0FACS Manual<\/em> takes on a safe, academic tone; however, this style does not work for everyone \u2014 especially creatives. Learning about the dynamic nature of our faces and the interplay between facial muscles and expressions can be exciting. FACS students should not feel stifled, bored, or overwhelmed; they should feel engaged.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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All hope is not lost!<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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If you\u2019re grappling with the limitations of the FACS Manual<\/em>, you\u2019re in luck. Man’s Face and Mimic Language, by Carl Herman Hjortsj\u00f6<\/a><\/strong>, is an incredible (free) resource for understanding how facial anatomy shapes expression. Though Hjortsj\u00f6 gets the occasional mention in discussions around FACS, the extent of his influence on the Facial Action Coding System is severely understated. You might even find the FACS Manual <\/em>to be uncomfortably similar to Man’s Face and Mimic Language<\/em> (a topic for another time). Check it out for yourself. It’s downloadable through the University of Innsbruck’s digital library<\/a><\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Need even more free alternatives?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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For those seeking material beyond Man’s Face and Mimic Language, <\/em>that\u2019s exactly why Face the FACS <\/em>exists. I teach FACS through an anatomical lens (a nod to Hjortsj\u00f6) and provide full color, motion-based references in my posts and guides. You can explore my free FACS content below:<\/p>\n