Documents for PDF .NET Edition
GrapeCity.Documents.Imaging Assembly / GrapeCity.Documents.Imaging Namespace / GcBitmap Class
Properties Methods

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    GcBitmap Class Members
    In This Topic

    The following tables list the members exposed by GcBitmap.

    Public Constructors
     NameDescription
    Public ConstructorOverloaded.   
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    Public Properties
     NameDescription
    Public PropertyGets the horizontal dpi of the bitmap.  
    Public PropertyGets the vertical dpi of the bitmap.  
    Public PropertyGets or sets an instance of GrapeCity.Documents.Imaging.Exif.ExifProfile with Exif metadata of the image.  
    Public PropertyGets an instance of the GcBitmapGraphics class.

    The Graphics becomes available after executing the CreateGraphics method.

     
    Public PropertyGets a value indicating whether the internal image is loaded or created.  
    Public PropertyGets the height of the image, in DIPs.  
    Public PropertyGets or sets the raw ICC profile data.  
    Public PropertyGets a value indicating whether the GcBitmap has been disposed of.  
    Public PropertyGets or sets a pixel color value at the specified coordinates.  
    Public PropertyGets or sets a value indicating whether the alpha channel of the image should be ignored.  
    Public PropertyGets the pixel height of the image.  
    Public PropertyGets the pixel width of the image.  
    Public PropertyGets or sets a value indicating if the color channels for all pixels are premultiplied by the alpha channel.

    Setting this property doesn't perform actual conversion.

     
    Public PropertyGets a pointer to the internal binary data.  
    Public PropertyGets an instance of the BitmapRenderer class.

    The renderer becomes available after executing the EnsureRendererCreated method.

     
    Public PropertyGets the width of the image, in DIPs.  
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    Public Methods
     NameDescription
    Public MethodOverloaded. Adjusts the levels of an image histogram.

    The method maps the input range of values (blackPoint..whitePoint) to the output range (outputBlack..outputWhite) using the specified gamma correction (midtone).

     
    Public MethodDraws the source bitmap with the specified opacity into the current bitmap.  
    Public MethodMultiplies RGBA values of the GcBitmap by a 5x4 matrix.  
    Public MethodApplies a graphic effect to an image or its portion in-place.  
    Public MethodApplies a license key to an instance of GcBitmap.  
    Public MethodOverloaded. Applies a transparency mask to the current image or its portion.  
    Public MethodModifies R, G, B color intensities such that the maximum range of values (0..255) is fully covered.  
    Public MethodPerforms a bit-block transfer of the color data corresponding to a rectangle of pixels from the specified source bitmap into the current bitmap.  
    Public MethodCalculates Otsu's threshold [0..255] for a grayscale image.

    It is expected that the image is already converted to monochromatic gray.

     
    Public MethodOverloaded. Clears the GcBitmap with the specified color.  
    Public MethodCreates a new GcBitmap with a fragment of the image.  
    Public MethodOverloaded. Creates a new GcBitmap with a copy of the image.  
    Public MethodApplies the algorithms of Porter Duff compositing and blending to the current bitmap (used as backdrop, destination) and the source bitmap.  
    Public MethodOverloaded. Makes the alpha channel not premultiplied in the color channels and sets the Premultiplied property to False.  
    Public MethodOverloaded. Converts an image with transparent or semitransparent pixels to fully opaque with specified background color.  
    Public MethodOverloaded. Premultiplies the color channels by the alpha channel and sets the Premultiplied property to True.  
    Public MethodCreates an instance of the GcBitmapGraphics class.  
    Public MethodOverloaded. Creates the image of the given size and resolution.

    The content is not initialized and can contain any random data.

    If subsequent rendering is going to cover the whole surface of the bitmap, or if CreateGraphics will be called on the bitmap with a non-null background color, clearing it (which is a lengthy operation for large bitmaps) is not needed. If some areas of the bitmap are going to be left untouched, they must be cleared to avoid the possibility of random artifacts showing.

     
    Public MethodReleases the internal image and clears all metadata.  
    Public MethodClean up any resources being used.  
    Public MethodCreates a BitmapRenderer that allows to draw on the GcBitmap, if it has not been created yet.  
    Public MethodCopies data from one color channel of the current GcBitmap to an existing GrayscaleBitmap of the same pixel size.  
    Public MethodCreates a sorted array of unique colors for the current image.  
    Public MethodProduces a flipped (horizontal or vertical) and/or rotated (by 90 degree increments) bitmap.

    The source bitmap remains unchanged.

     
    Public MethodGenerates a palette for the image using the Octree quantizer algorithm.

    The Alpha color channel is ignored.

     
    Public MethodOverloaded. Returns the coordinates of a rectangle with colors different from background.  
    Public MethodDetermines whether the image contains transparent or semitransparent pixels.

    It always returns false for an opaque image.

     
    Public MethodCopies data from a GrayscaleBitmap to one color channel of the current GcBitmap of the same pixel size.  
    Public MethodOverloaded. Loads the image from a stream. JPEG, PNG, GIF, BMP, TIFF, JPEG 2000 formats are supported.  
    Public Methodstatic (Shared in Visual Basic)Merges sorted arrays of unique colors in 32-bit ARGB format (returned from ExtractColors)  
    Public MethodCreates a new GcBitmap with a resized image fragment.  
    Public MethodOverloaded. Saves the image into a Stream in BMP format.  
    Public MethodOverloaded. Saves the image into a Stream in GIF format.  
    Public MethodOverloaded. Saves the image into a Stream in ICO format.  
    Public MethodOverloaded. Saves the image into a Stream in JPEG format with specified quality (from 0 to 100).  
    Public MethodOverloaded. Saves the image into a Stream in PNG format.  
    Public MethodOverloaded. Saves the image into a Stream in TIFF format.  
    Public MethodUpdates the alpha channel of pixels to 255 (to make them opaque).  
    Public MethodOverloaded. Changes the physical resolution of the image.  
    Public Methodstatic (Shared in Visual Basic)Sets the license key.  
    Public MethodOverloaded. Changes pixel format from 8 bits per channel to lower values with two-dimensional error diffusion.  
    Public MethodCreates a BilevelBitmap from the current GcBitmap.

    This method does not perform any transformations of the color palette. It is expected that the source GcBitmap has already been converted to bi-level palette using some thresholding or dithering effects. The ToBilevelBitmap method just copies data from a specified color channel to a new instance of the BilevelBitmap class.

     
    Public MethodCreates a GrayscaleBitmap from the current GcBitmap.

    This method does not perform any transformations of the color palette. It is expected that the source GcBitmap has already been converted to grayscale palette using a GrayscaleEffect or something like that. Alternatively, you can use this method to extract individual channels of a color image without any prior conversion, and treat the resulting GrayscaleBitmap simply as a representation of some image data with 8 bits per pixel. The ToGrayscaleBitmap method just copies data from a specified color channel to a new instance of the GrayscaleBitmap class. If you need to copy some color channel to an existing instance of GrayscaleBitmap, use the ExportColorChannel method instead.

     
    Public MethodOverloaded. Creates an opaque Indexed4bppBitmap from the current image using the Octree quantizer algorithm.  
    Public MethodOverloaded. Creates an opaque Indexed8bppBitmap from the current image using the Octree quantizer algorithm.  
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    See Also