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Saving

A Movie
An Image Sequence


SheerVideo User Manual

Apple QuickTime Player
Saving: An Image Sequence


To convert an open RGB[A] movie, slide show, or image sequence to a sequence of SheerVideo QuickDraw Picture (PICT) files or SheerVideo QuickTime Image (QTIF) files:

  • File > Export… In QuickTime Player's menu bar, select File > Export… to bring up the Save exported file as… dialog box.
  • Save exported file as… Dialog

  • Save As Specify the output image base name in the Save As text field at the top of the Save dialog box.
  • Export: Movie to QuickTime Movie Select Export: Movie to Image Sequence in the pop-up menu near the bottom of the Save dialog box.
  • Use: Most Recent Settings Select Use: Most Recent Settings in the pop-up menu at the bottom of the Save dialog box, once it's enabled.
  • Options... Click the Options… button on the side of the Save dialog box to bring up the QuickTime Export Image Sequence Settings dialog box.

  • In the Format pop-menu at the top of the Export Image Sequence Settings dialog box, select one of the following:
    • Format: PICT PICT, to output QuickDraw Picture (PICT) files
    • Format: QuickTime Image QuickTime Image, to output QuickTime Image (QTIF) files

  • Format: PICT Select Frames per second: best in the pop-up menu in the middle of the Export Image Sequence Settings dialog box, unless you want to resample the video at a different rate.
  • Options... Click the Options… button at the bottom of the Export Image Sequence Settings dialog box to bring up the PICT Options or QuickTime Image Options dialog box.
  • PICT Options
    QuickTime Image Options

  • Ignore the Don't recompress checkbox at the top of the PICT Options or QuickTime Image Options dialog box, which, as of QuickTime 7.0, is never enabled.
  • Options... Click the Options… button in the middle of the PICT Options or QuickTime Image Options dialog box to bring up the Compression Settings dialog box.
  • Compression Settings

  • Compression type In the Compression type pop-up menu at the top of the Compression Settings dialog box, select the generic Sheer codec (See the Formats section for help.):
    • Sheer Sheer, to let SheerVideo automatically choose the appropriate Sheer pixel type according to the image format that it receives from QuickTime.

      The generic Sheer codec perfectly codes all QuickTime pixel formats that represent color directly without a color table at 8 to 10 bits per component, including ARGB, 10-bit 'b64a' and 'L64A', 10-bit 'b48r', 'R10k', 'r210', 10-bit 'r4fl', 'V416', 'v410', 'v408', 'VUYA', 'r408', 'v210', 10-bit 'v216', 10-bit 'Y216', '2vuy', '2Vuy', 'yuvu', 'yuvs', 'yuv2', and, on PC+Windows, ABGR, RGBA, BGRA, RGB, and BGR.

      For RGB[A] formats, this codec can also output to B555, and, on PC+Windows, L555 and L565.

      Note that the generic Sheer codec is the only SheerVideo codec that encodes the obsolete wide-range 'yuvu' or 'yuv2' (Y'CbCr 8bw 4:2:2) pixel format.

    You should only use one of the specific Sheer codecs if you know the source pixel format, since otherwise you are likely to degrade the image. See the instructions on selecting the Mode, Pixel Format Conversion, and Video Target below. Certain pixel-format conversions are inherently destructive, and will almost certainly degrade the image. Inherently destructive conversions include reducing the sample precision, such as from 10-bit to 8-bit; reducing the chroma sampling, such as from 4:4:4 to 4:2:2; and converting between RGB and Y'CbCr without adequately increasing the sample precision - even with Synchromy™.

    • Sheer RGB[A] 8bf Sheer RGB[A] 8bf, for broadcast-quality scanned film and computer-generated imagery.

      Perfectly codes pixel formats ARGB, and, on PC+Windows, ABGR, RGBA, BGRA, RGB, and BGR.

      In Best Conversion mode, this codec also converts pixel formats 'L64A', 'b48r', 'R10k', 'r210', 'r4fl', 'V416', 'v410', 'v408', 'VUYA', 'r408', 'v210', 'v216', 'Y216', '2vuy', '2Vuy', and 'yuvs'.

      This codec can also output to B555, and, on PC+Windows, L555 and L565.

    • Sheer RGB[A] 10bf Sheer RGB[A] 10bf, for studio-quality scanned film and computer-generated imagery.

      Perfectly codes pixel formats 10-bit 'b64a' and 'L64A', 10-bit 'b48r', 'R10k', and 'r210', as well as ARGB, and, on PC+Windows, ABGR, RGBA, BGRA, RGB, and BGR.

      This codec also nondestructively converts 'v408', 'VUYA', and 'r408' using Synchromy technology.

      In Best Conversion mode, this codec also converts pixel formats 'r4fl', 'V416', 'v410', 'v210', 'v216', 'Y216', '2vuy', '2Vuy', and 'yuvs'.

      This codec can also output to B555, and, on PC+Windows, L555 and L565.

    RGB stands for {Red, Green, Blue}, the color representation used by the human eye, scanners, and displays.

    [A] stands for an optional Alpha channel specifying opacity or coverage, used for compositing.

    Y'CbCr stands for {luma (Y), Chroma blue-yellow, Chroma red-cyan}, the color representation used by television.

    8b stands for 8 bits of information per color channel, the standard precision of digital displays.

    10b stands for 10 bits of information per color channel, the standard precision of digitized film and computer-generated imagery.

    Note that QuickDraw pictures and QuickTime Image Files do not support any Y'CbCr[A] pixel formats, and QuickTime will convert any such images into RGB[A] before passing them to the encoder, potentially degrading the image. Unfortunately, QuickTime does not provide any mechanism for the encoder to determine the source format.

  • Depth Alpha: In the Depth pop-menu at the top of the Compressor section on the left side of the Compression Settings dialog box, select one of the following:

    • Millions of Colors Millions of Colors, if there is no alpha channel or you want to ignore it.
    • Millions of Colors+ Millions of Colors+, if there is an alpha channel and you want to preserve it.

    Note that for 10-bit codecs, the Depth pop-up menu erroneously offers "Millions" instead of "Billions" of colors. Nevertheless, QuickTime Player Pro does properly support 10-bit codecs.

    To find out whether your input movie has an alpha channel, see the Alpha instructions in the Formats section below.

  • Best Ignore the Quality slider in the middle of the Compressor section of the Compression Settings dialog box. It has no effect on the compression quality of SheerVideo QuickTime Image or QuickDraw PICT images, which is always perfect or best (Quality=Best=100).
  • Options... Click the Options… button at the bottom of the Compressor section of the Compression Settings dialog box to bring up the SheerVideo Options dialog box.
  • Sheer Settings Dialog

  • Mode: SheerVideo's self-check mode verifies each compressed video frame by decompressing it to the original pixel format and comparing the restored frame to the original. You should only use self-check mode when no pixel-format conversion is required or when perfect pixel-format conversion is possible.

    Self-check mode must be turned off to allow destructive conversion. Unfortunately, you must use One-way Mode for all Sheer Y'CbCr[A] codecs except Sheer Y'CbCr[A] 10bv 4:4:4[:4], because the preview image in the QuickTime Compression Settings dialog box requires RGB 8b encoding support, and even with Synchromy technology, RGB[A] 8bf pixel formats cannot be perfectly converted to any Y'CbCr[A] formats of precision less than 10 bits or to perfectly convert RGB[A] images back to 4:2:2[:4] chroma-subsampled images.

    At the top of the Algorithms section, select one of the following radio buttons:

    • One-way (faster) One-way (faster), to have SheerVideo just encode the video. This is the default value.
    • Self-check (safer) Self-check (safer), to have SheerVideo encode, decode, and compare the result, to verify that each frame is encoded with perfect fidelity.

    Note that SheerVideo is so fast compared to other system bottlenecks that you may not notice any slowdown in using the self-check mode, especially for frames small enough to fit in the CPU cache.

  • Code: Many of SheerVideo's codecs are available in two forms: scalar code, to run on a scalar processor; and vectorized code, to run on a vector processor. The vectorized code speeds up encoding and decoding by nearly a factor of two, but increases energy consumption, which can be an important consideration on battery-powered computers.

    At the bottom of the Algorithms section, select one of the following radio buttons:

    • Scalar Scalar (energy saver), to have SheerVideo execute a scalar code version of the codec, to save battery power on a laptop with a vector processor, such as a PowerBook G4.
    • Vectorized Vectorized (faster), to have SheerVideo execute a vectorized code version of the codec. When available, this is the default value.
  • Coding: Every SheerVideo codec offers two different coding schemes, one which is generally more suitable for progressive-scan images, and one which is usually better for interlaced images.

    In the Coding section, select one of the following radio buttons:

    • Progressive Progressive, if you want to encode the image in progressive-scan mode.
    • Interlaced Interlaced, if you want to encode the fields independently.
    • Automatic Automatic, if you want the coding method to be determined by the images' Field Info image description extension. This is the default value.

    Note that choosing the "wrong" scanning mode may reduce the compression power, but the video will still be encoded with perfect fidelity. Some software, such as Apple's Component Video codec, does not set the scanning-mode flags in the video track correctly. Note that the interlaced coding scheme is typically slightly faster.

  • Pixel Format Conversion: The Sheer codecs are designed to be strictly nondestructive, and try to prevent the user from inadvertently losing image information by accidentally choosing the wrong codec and thus reducing the sample precision, changing the chroma sampling, or converting the color space without increasing the sample precision.

    However, it is sometimes necessary to convert between different representations, even if such a conversion is impossible without some information loss. For example, when combining video and film elements, when using a tool which does not operate in the desired pixel format, or when outputting a low-bandwidth version for review or distribution, such conversion is inevitable.

    To deal with such cases, SheerVideo allows the user to explicitly sanction destructive conversion.

    In the Pixel Format Conversion section, select one of the following radio buttons:

    • Perfect Perfect, to accept only pixel formats that can be encoded perfectly.
    • Best Best, to encode using the best possible method even if the pixel format cannot be converted without information loss.

    Synchromy To convert between Y'CbCr and RGB color spaces, SheerVideo uses BitJazz's patented Synchromy™ technology, (US Patent 7,659,911) which is more accurate than any other color-conversion method. In particular, Synchromy converts with absolutely no information loss between the original and final images in the following workflows for QuickTime Image Files and QuickDraw Picture Files:

    • Y'CbCr[A] 8bv 4:4:4[:4] → Sheer RGB[A] 10bf → Y'CbCr[A] 8bv 4:4:4[:4]
    • Sheer RGB[A] 10bf → Y'CbCr[A] 12bv 4:4:4[:4] → Sheer RGB[A] 10bf
    • Sheer RGB[A] 8bf → Y'CbCr[A] 10bv 4:4:4[:4] → Sheer RGB[A] 8bf

    Note that the other three nondestructive color-conversion workflows available for video work, which rely on Sheer Y'CbCr codecs, are unavailable for QTIF and PICT files because QuickDraw does not support Y'CbCr pixel formats.

    Note that if pixel-format conversion does actually result in information loss, the self-check will fail, so self-check mode must also be turned off to permit imperfect conversion.

    Note that you must use Best Conversion for all Y'CbCr sources except when encoding Y'CbCr[A] 8bv 4:4:4[:4] to Sheer RGB[A] 10bf, because QuickTime Image Files and QuickDraw Picture files do not support Y'CbCr[A] images, and even with Synchromy technology, it is not possible to perfectly convert Y'CbCr[A] to RGB[A] images of the same precision, or to perfectly convert RGB[A] images back to 4:2:2 chroma-subsampled images.

  • Select the video color standard of the Y'CbCr target for Sheer Y'CbCr[A] codecs, and of the Y'CbCr source for Sheer RGB[A] codecs, by clicking on one of the following radio buttons in the Video Source Default section of the Sheer Settings dialog box:

    • NTSC NTSC, for composite NTSC (SMPTE 170-M-1994), digital 525 (SMPTE 125-M-1995, SMPTE 267-M-1995, SMPTE 259-M-1997), or 720x483 progressive 16:9 (SMPTE 293-M-1996)
      This is the default value.
    • PAL PAL, for composite PAL or SECAM (ITU-R BT.470-4), or for digital 625 (ITU-R BT.656-3).
    • HD HD, for all current HD formats (ITU-R BT.709-2), including 1920x1080 HDTV (SMPTE 274-M-1995) and 1280x720 HDTV (SMPTE 296-M-1997).
    • HD 1035 HD 1035, for 1920x1035 HDTV (SMPTE 240-M-1995, SMPTE 260-M-1992) as well as the obsolete interim color implementation of 1920x1080 HDTV (SMPTE 274-M-1995).
  • OK Click the OK button at the bottom of the Sheer Settings dialog box to confirm the Sheer options settings and dismiss the Sheer Settings dialog box.
  • OK Click the OK button at the bottom of the Compression Settings dialog box to confirm the compression settings and dismiss the Compression Settings dialog box.
  • OK Click the OK button at the bottom of the PICT Options / QuickTime Image Options dialog box to confirm the PICT / QuickTime Image options and dismiss the PICT Options / QuickTime Image Options dialog box.
  • OK Click the OK button at the bottom of the Export Image Sequence Settings dialog box to confirm the image-sequence export settings and dismiss the Export Image Sequence dialog box.
  • Save Click the Save button at the bottom of the Save exported file as… dialog box to dismiss the Save dialog box and export the movie frames as a sequence of SheerVideo PICT or QTIF images.

If you save an image in SheerVideo format in a QuickDraw Picture file, the image will be openable by any application that can open PICT files, which includes essentially all Macintosh applications that can open any image files at all, including TextEdit and SimpleText. The drawback is that the SheerVideo PICT file is about 924 bytes bigger than the SheerVideo image file itself.

If you save an image in SheerVideo format in a QuickTime Image file, the image will be openable by any application that can open QuickTime Image files. A SheerVideo QuickTime Image file is only about 128 bytes longer than the SheerVideo image itself, so it wastes less space than a SheerVideo PICT file.

QuickDraw Picture files have the file type 'PICT' or 'grex', and the file name extension ".pict" or ".pct". QuickTime Image files have the file type 'qtif', and the file name extension ".qtif" or ".qti".


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