Windows Media Photo A new format for end-to-end digital imaging Bill Crow Principal Program Manager Digital Media Division Microsoft Corporation.
Download ReportTranscript Windows Media Photo A new format for end-to-end digital imaging Bill Crow Principal Program Manager Digital Media Division Microsoft Corporation.
Windows Media Photo A new format for end-to-end digital imaging Bill Crow Principal Program Manager Digital Media Division Microsoft Corporation Overview Enabling technology to significantly improve end-to-end digital imaging Superior Image Quality Better Performance New Opportunities Overview Support for the Widest Range of Pixel Formats 8, 16 or 32 bits per channel, multiple packed bit formats Unsigned integer, fixed point, floating point RGB, CMYK, Grayscale, n-Channel; planar or interleaved alpha High Performance, Low Footprint Algorithm Optimized for device implementation Small buffer requirements, no complex math Advanced Decoding and Transformation Operations Mipmaps (variable frequency decode), region decode Compressed domain crop, rotate/flip and resolution reduction 2x Compression Improvement Over Today’s Standard The same image quality in a file that is ½ the size of JPEG Smaller files encode/decode/transfer faster, with less power Lossless plus lossy compression with the same algorithm Preserving All The Content Today’s unsigned integer formats discard useful information 12+ bpc linear RGB 8+ bpc nonLinear RGB 16+ bpc linear HDR scRGB Camera Source Devices Scanner Source Devices 12-16+ bpc linear RGB 8bpc non-linear RGB Intermediate Intermediate Storage, Storage, Editing and Editing and Management Management Display Destination Devices Printer Destination Devices 8+ bpc nonLinear CMYK Unprocessed Source Data Processed Source Image Unsigned Integer RGB Image Unsigned Integer RGB Image Fixed Point Or Float RGB Image Fixed Point Or Float RGB Image Exposure Adjustment sRGB Original sRGB Adjusted -1.5 stops 16bpc unsigned integer 16bpc unsigned integer scRGB Original scRGB Adjusted -1.5 stops 16bpc fixed point 16bpc fixed point Compression Versus Quality P12 - Full - 8bpc WMPhoto JPEG-2K ▲ JPEG 55 50 RGB Peak SNR 45 40 WMPhoto JPEG-2K JPEG 35 30 25 20 0 1 2 3 4 Bit Rate (Bits/Pixel) 5 6 7 Windows Media Photo Bill Crow Principal Program Manager Digital Media Division Benefits An efficient, standardized photo interchange format that preserves the entire dynamic range Significantly improved ability to correct poor images Images look better with more shadow and highlight detail Exposure and color corrections don’t discard dynamic range Supports end-to-end acquisition, editing, rendering, printing Better photos that are ½ the size of JPEG Faster transfer, less device power consumption Significant reduction in storage space requirements 25x compression or more is reasonable for typical photos Allows higher resolution images for email and web Color And Compression Flexible color space support 8 or 16 bpc unsigned integer 16 or 32 bpc fixed point, floating point RGB, CMYK, Grayscale, n-channel 5-5-5, 5-6-5, 10-10-10 packed-bit RGB 1bpc black/white, mask 4:4:4, 4:2:2, 4:2:0 color sampling Interleaved or planar alpha channel High performance compression technology Lossy and lossless compression with a single algorithm No complex math; can be implemented with low gate counts Minimal memory requirements, no full frame buffer required Symmetric algorithm, equal complexity for encode and decode Advanced Operations Structured compressed domain organization Progressive decode – fast previews and thumbnails Region decode Compressed domain transforms Cardinal rotation, flip Down-sample Crop Spatial versus frequency data re-organization Two optional levels of overlap encoding Bit stream and decoder support for custom dynamic Q Per channel Per macro-block Very large image dimensions 216 x 216 macro-blocks per tile, 28 x 28 tiles, 268m2 pixels Container And Metadata TIFF-like IFD structure Provides maximum compatibility with existing code Multiple images supported via linked IFD tables 32-bit internal byte pointers, 4Gb max file size To be addressed in future version Flexible Metadata WMPhoto-defined IFD tags for image format and structure Pixel Format GUID Width, Height, Resolution Transformation Image and Alpha data pointers, size Industry-compatible IFD tags for descriptive info XMP metadata ICC profile TIFF-compatible descriptive tags EXIF metadata Describing The Bitmap Multiple current solutions TIFF uses basic colorimetric info based on predefined photometric interpretations TIFF/EP uses ICC Profile JPEG carries basic RGB colorimetric info WMPhoto: PixelFormat GUID and ICC Profile PixelFormat GUID is unambiguous, compact and extensible ICC Profile for legacy unsigned integer pixel formats “Default” color context when no ICC profile is present Unsigned integer RGB: sRGB Unsigned integer CMYK: SWOP Signed/float RGB: scRGB (linear, unprofiled) Gray: Luminance-only component of equivalent RGB context Windows Imaging Component (WIC) New imaging infrastructure for Windows Windows Vista, Windows Presentation Foundation and WIC-only redistributable Extensible pixel formats and codecs Provides an HDR image processing pipeline Windows Media Photo fully supports WIC API’s WMPhoto Class WIC Interface CWMPCodecInfo IWICBitmapEncoderInfo IWICBitmapDecoderInfo CWMPEncoder IWICBitmapEncoder CWMPDecoder IWICBitmapDecoder CWMPDecoderFrame IWICBitmapFrameDecoder IWICBitmapSourceTransform IWICMetadataBlockReader CWMPEncoderFrame IWICBitmapFrameEncode IWICBitmapMetadataBlockWriter IPropertyBag2 WIC Encoder Parameters Canonical Parameters Property Name VARTYPE Value ImageQuality VT_R4 0.0 - 1.0 Lossless VT_BOOL True/False BitmapTransform VT_UI1 WICBitmapTransformOptions Windows Media Photo Specific Parameters Property Name VARTYPE Value Quality VT_UI1 1 – 255 (Default: 1 - lossless) Overlap VT_UI1 0 – 2 (Default: 1) Subsampling VT_UI1 0 – 3 (Default: 3 – 4:4:4) HorizontalTileSlices VT_UI2 0 – 4095 (Default: 0) VerticalTileSlices VT_UI2 0 – 4095 (Default: 0) FrequencyOrder VT_Bool True/False (Default: True) InterleavedAlpha VT_Bool True/False (Default: False) AlphaQuality VT_UI1 1 – 255 (Default: 1 - lossless) CompressedDomainTranscode VT_Bool True/False (Default: True) ImageDataDiscard VT_UI1 0-3 (Default: 0) AlphaDataDiscard VT_UI1 0-4 (Default: 0) WIC Advanced Decoding Supports IWICBitmapSourceTransform for high performance decoding options Arbitrary rectangular regions 2x mipmaps for nearest size decoding Native decode at 1x, 4x, 16x Interpolated decode at 2x, 8x, >16x Natively supports all rotate/flip transforms Pixel format conversion during decode under consideration for future support Compressed Domain Operations Specifying a WMPhoto decoder as the source for a WMPhoto encoder invokes compressed domain operations, when possible Rotate/flip transformation Crop Resolution reduction Spatial versus frequency reorganization Significant benefits by avoiding lossy compressed decode and re-encode No additional image quality loss Dramatically faster operations Additional Resources Device Porting Kit RTM 1.0 is available now http://www.microsoft.com/windows/windowsmedia/wmphoto Bit stream spec is final Includes reference ANSI-C source code Support for both little-endian and big-endian architectures Windows Imaging Component (WIC) codec available now Functionally complete in Windows Vista Beta 2 Same codec is also distributed via WinFX and WIC redists WIC Info: http://windowssdk.msdn.com/library/en-us/wic/wiclh/wiclh.asp Power Toys (viewer, converter) coming for Windows XP Related Sessions Windows Color System / High Dynamic Range Imaging Developing XPSDrv Printer Drivers Using XPSDrv Printer Drivers Technical questions: wmphoto @ microsoft.com Call To Action Use WinFX or WIC for Windows imaging applications, including drivers Support high dynamic range workflows Add support for Windows Media Photo anywhere your device or application reads or writes image files Enhance the features and performance of your device or application with compressed domain operations Implement XPS with Windows Media Photo support for printers, drivers and applications © 2006 Microsoft Corporation. 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