• Compression Techniques

  ProRes Compression loses quality on some colors more than others?

  Posted by Eddie Gali on March 12, 2012 at 7:28 pm

  Hey Folks,

  So I rendered a movie out of AE with Apple ProRes 422 and Apple ProRes 422 (HQ).
  I then exported the file using H.264 with a MPEG-4 wrapper using MPEG Streamclip 1.9.2. It’s a slide show and most of the images have the word “SPORT” in them in large block letters in varying colors and backgrounds. Now you can see that when the movie is rendered with ProRes that the area around the word “SPORT” in one of the still images becomes slightly blurred around the edges, which when compressed into H.264 becomes pixelated. “SPORT” is Magenta-Red (R:207, G:6, B:127) on a Deep Magenta-Red (R:84, G:1, B:37) background. None of the other colors become blurred in the render or pixelated after compression. I’m assuming the problem is with the initial rendering. The settings are listed below. My boss says he’s heard that certain colors aren’t compressed as well and told me to look into it.

  Render Settings

  Quality: Best
  Resolution: Full
  Size: 1280×720
  Proxy Use: Use No Proxies,
  Effects: Current Settings
  Disk Cache: Read Only
  Color Depth: Current Settings
  Frame Blending: On for Checked Layers
  Field Render: Off
  Pulldown: Off
  Motion Blur: On for Checked Layers
  Use OpenGL: Off
  Solos: Current Settings

  Output Module

  Format: QuickTime
  Output Info: Apple ProRes 422
  Spatial Quality = 100
  Output Audio: 48.000 kHz / 16 bit/ Stereo
  Channels: RGB
  Depth: Millions of Colors
  Color: Premultiplied
  Final Size: 1280×720

  Any insight is appreciated. Thanks!

  Eddie Gali replied 14 years, 2 months ago 1 Member · 0 Replies
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