• photoshop保存dds > JPEG:静态图像专家组制定
  • JPEG:静态图像专家组制定

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    } BITMAPINFOHEADER;
    http://blog.csdn.net/sjzlxd/archive/2009/02/22/3923907.aspx
    Color palette
    typedef struct tagRGBQUAD {
    BYTErgbBlue;// blue
    BYTErgbGreen; // green
    BYTErgbRed; // red
    BYTErgbReserved;// reserved
    } RGBQUAD;
    The number of RGBQUAD is decided by biBitCount:
    when biBitCount=1, 4, 8,the number is :2, 16, 256;
    when biBitCount=24,no RGBQUAD.
    typedef struct tagBITMAPINFO {
    BITMAPINFOHEADER bmiHeader;
    RGBQUAD bmiColors[1];
    } BITMAPINFO;
    Bitmap data
    http://blog.csdn.net/sjzlxd/archive/2009/02/22/3923907.aspx
    Digital image processing
    more examples…
    Edge enhancement
    Histogram extension
    Image negatives
    Butterworth filtering
    Enhancement in the spatial domain
    Histogram
    Piecewise-linear transformation functions
    Image enhancement based on gradient
    Histogram
    Histograms are not only the basis for numerous spatial domain processing techniques, but also are very useful in other image processing applications, such as image compression and segmentation
    an image with gray levels [0, L-1]
    h(rk) = nk
    where rk is the kth gray level
    nk is the number of pixels having gray level rk
    normalizing the number
    p(rk) = nk/n
    Examples
    Piecewise-linear transformation functions
    Contrast stretching: the idea behind contrast stretching is to increase the dynamic range of the gray levels in the image.
    Piecewise-linear transformation functions
    How to stretch

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