{"id":597,"date":"2017-11-07T09:02:23","date_gmt":"2017-11-07T15:02:23","guid":{"rendered":"http:\/\/ciraldo.stream\/uwm-vfx2\/?page_id=597"},"modified":"2017-11-10T14:50:16","modified_gmt":"2017-11-10T20:50:16","slug":"scopes","status":"publish","type":"page","link":"https:\/\/ciraldo.stream\/uwm-vfx2\/topics\/scopes\/","title":{"rendered":"Histogram, Waveform Monitor, & Vectorscope"},"content":{"rendered":"

Histogram, Waveform Monitor, & Vectorscope<\/h1>\n

[ Lecture Notes<\/a> ] [ Lab<\/a> ] [ Homework<\/a> ]<\/h5>\n

 <\/p>\n

When judging the color and\/or tonality of an image on a screen or viewfinder, it’s a good idea to be suspicious of the accuracy<\/strong> of the hardware,<\/strong> and even your own eyes.<\/strong><\/p>\n

After all, even if<\/strong> your hardware is perfectly calibrated, and even if<\/strong> your eyes are extremely well trained, sometimes<\/strong> your brain,<\/strong> in an attempt to fill in missing contextual information, will add a layer of mental subjectivity on top of physical reality:<\/strong><\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

Therefore, it’s a good idea to use various tools like the histogram, waveform monitor, and vectorscope<\/strong> to take a cold, hard look at what’s going on in our footage.<\/p>\n

In After Effects<\/strong> and Premiere,<\/strong> these displays and scopes are provided in a panel called “Lumetri Scopes”.<\/strong>\u00a0 And, the associated effect for manipulating color and luminance (in both programs) is called “Lumetri Color”.<\/strong><\/p>\n

Histogram<\/h1>\n

This graph is almost like a “vote tally” of the various brightness levels<\/strong> in the image. For the horizontal version, pure black pixels<\/strong> are tallied up on the far-left<\/strong> side, pure white pixels<\/strong> are tallied up on the right<\/strong>, and all other brightness values are tallied in between.<\/strong><\/p>\n

\"\"
Horizontal histogram from the Levels effect<\/figcaption><\/figure>\n

The vertical version in the Lumetri Scopes<\/strong>\u00a0is similar, but with darks at the bottom and brights at the top.<\/p>\n

\"\"
Vertical histogram from the Lumetri effect<\/figcaption><\/figure>\n

A histogram can help you quickly see how dark your blacks are, <\/strong>how bright your whites are,<\/strong> and how\u00a0<\/strong>the shot’s information is distributed from dark to light.<\/strong> Knowing where the bulk of an image’s “info” is stored can help when doing targeted corrections.<\/strong><\/p>\n

Waveform Monitor<\/h1>\n

Used to evaluate the brightness (shadows, mid-tones, highlights) of your image. Similar to a histogram, but instead of displaying a “vote tally” of all the various brightness values for the image as a whole, the Waveform Monitor presents (sort of)\u00a0a mini histogram for each vertical line of your image.<\/strong><\/p>\n

\"\"
A no-color waveform scope<\/figcaption><\/figure>
\"\"
A color waveform scope<\/figcaption><\/figure>
\"\"
Waveform Parade<\/figcaption><\/figure><\/p>\n

Unlike<\/strong> the Histogram, the Waveform Monitor displays a semi-recognizable version of your image<\/strong> allowing you to still be able to recognize specific features (such as faces for example) within the albeit abstract graph.<\/p>\n

Vectorscope<\/h1>\n

Used to evaluate the color (hue, saturation, etc)<\/strong> or chrominance<\/strong> of your image. Can also be used to evaluate white balance.<\/strong><\/p>\n

This is a radial graph of color saturation.\u00a0\u00a0<\/strong>(You might really impress someone at a party if you know that the decorations within the vectorscope is called its\u00a0graticule<\/strong>.<\/strong>)<\/p>\n

The normal color hue wheel is distributed around the circle in a somewhat odd shape, with blue at roughly 3 O’Clock, yellow at\u00a0 roughly 9 O’Clock, and so on.<\/p>\n

The center of the circle is zero saturation, which includes black, white, and all shades of gray in between.<\/p>\n

\"\"
Vectorscope YUV<\/figcaption><\/figure>\n

The different colored squares in the circle represent where colors from standard color bars test pattern would go.<\/p>\n

\u00a0<\/div>\n

\"\"
Color bars<\/figcaption><\/figure>
\"\"
Vectorscope of the color bars<\/figcaption><\/figure><\/p>\n

The diagonal line going from the center of the circle up and to the left<\/strong> (to around 11 o’clock or so) is a line showing where human skin tones should be<\/strong> in neutral (non-stylized) footage.<\/p>\n","protected":false},"excerpt":{"rendered":"

Histogram, Waveform Monitor, & Vectorscope [ Lecture Notes ] [ Lab ] [ Homework ]   When judging the color and\/or tonality of an image on a screen or viewfinder, it’s a good idea to be suspicious of the accuracy of the hardware, and even your own eyes. After all, even if your hardware is … <\/p>\n

Continue reading “Histogram, Waveform Monitor, & Vectorscope”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":71,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-597","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/ciraldo.stream\/uwm-vfx2\/wp-json\/wp\/v2\/pages\/597","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ciraldo.stream\/uwm-vfx2\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ciraldo.stream\/uwm-vfx2\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ciraldo.stream\/uwm-vfx2\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ciraldo.stream\/uwm-vfx2\/wp-json\/wp\/v2\/comments?post=597"}],"version-history":[{"count":12,"href":"https:\/\/ciraldo.stream\/uwm-vfx2\/wp-json\/wp\/v2\/pages\/597\/revisions"}],"predecessor-version":[{"id":628,"href":"https:\/\/ciraldo.stream\/uwm-vfx2\/wp-json\/wp\/v2\/pages\/597\/revisions\/628"}],"up":[{"embeddable":true,"href":"https:\/\/ciraldo.stream\/uwm-vfx2\/wp-json\/wp\/v2\/pages\/71"}],"wp:attachment":[{"href":"https:\/\/ciraldo.stream\/uwm-vfx2\/wp-json\/wp\/v2\/media?parent=597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}