Scopes and color grading/inspection tools

[phistep]

To have assist in color grading/coloring we should implement some scopes/color analysis tools. The main tools I have in mind are:

• [x] Vectorscope
  • http://www.videomaker.com/videonews/2012/04/essential-video-skills-reading-a-vectorscope-and-waveform-monitor
  • https://library.creativecow.net/articles/devis_andrew/Premiere-Pro-Vectorscope/video-tutorial
  • http://www.premiumbeat.com/blog/vectorscope-premiere-pro/
• [x] Waveform
• [x] Historgram (Color/Image?) understanding: tone & contrast, luminosity & color
• [x] RGB Parade (?)

also: final cut pro vs adobe premiere scopes, Apple support about scope settings in final cut pro

But we need the #48 infrastructure first. let it begin \o/

[phistep]

• concertina panel label color
• R G and B draw colors
• Histogram
  • use paths instead (like final cut pro)
  • RGB combined mode
  • change capitalization of mode enums
  • calculate luma with dot(rgb, vec3(.2126, .7152, .0722)) formula (the juce Colour class really sucks all the way down)
  • gradbar in rb mode
• Vectorscope
  • mouse listener circle with radius (like kdenlive)
  • correct 100%, 75% markers (per color)
  • color gradient circular border
  • first cache in array, then draw at once to reduce alpha blending
  • 125% mode clip correctly
  • zoom mode as different propertycomponent
  • display hue and saturation of HSL color space not HSB/HSV
• Waveform
  • fix visibility
  • mouse listener for horizontal line
  • fix color modes