Field Detail

• MAX_COLS_ROW

  public static final int MAX_COLS_ROW

  Absolute allowed maximum value for rows and cols (2^24 ~16 million). (bytesPerRow must fit in a 32bit integer, though total amount of pixels not necessarily).

  See Also:

  Constant Field Values

• cols

  public final int cols

  Cols= Image width, in pixels.

• rows

  public final int rows

  Rows= Image height, in pixels

• bitDepth

  public final int bitDepth

  Bits per sample (per channel) in the buffer (1-2-4-8-16). This is 8-16 for RGB/ARGB images, 1-2-4-8 for grayscale. For indexed images, number of bits per palette index (1-2-4-8)

• channels

  public final int channels

  Number of channels, as used internally: 3 for RGB, 4 for RGBA, 2 for GA (gray with alpha), 1 for grayscale or indexed.

• alpha

  public final boolean alpha

  Flag: true if has alpha channel (RGBA/GA)

• greyscale

  public final boolean greyscale

  Flag: true if is grayscale (G/GA)

• indexed

  public final boolean indexed

  Flag: true if image is indexed, i.e., it has a palette

• packed

  public final boolean packed

  Flag: true if image internally uses less than one byte per sample (bit depth 1-2-4)

• bitspPixel

  public final int bitspPixel

  Bits used for each pixel in the buffer: channel * bitDepth

• bytesPixel

  public final int bytesPixel

  rounded up value: this is only used internally for filter

• bytesPerRow

  public final int bytesPerRow

  ceil(bitspp*cols/8) - does not include filter

• samplesPerRow

  public final int samplesPerRow

  Equals cols * channels

• samplesPerRowPacked

  public final int samplesPerRowPacked

  Amount of "packed samples" : when several samples are stored in a single byte (bitdepth 1,2 4) they are counted as one "packed sample". This is less that samplesPerRow only when bitdepth is 1-2-4 (flag packed = true)

  This equals the number of elements in the scanline array if working with packedMode=true

  For internal use, client code should rarely access this.

Constructor Detail

• ImageInfo

  public ImageInfo(int cols,
           int rows,
           int bitdepth,
           boolean alpha)

  Short constructor: assumes truecolor (RGB/RGBA)

• ImageInfo

  public ImageInfo(int cols,
           int rows,
           int bitdepth,
           boolean alpha,
           boolean grayscale,
           boolean indexed)

  Full constructor

  Parameters:

  cols - Width in pixels

  rows - Height in pixels

  bitdepth - Bits per sample, in the buffer : 8-16 for RGB true color and greyscale

  alpha - Flag: has an alpha channel (RGBA or GA)

  grayscale - Flag: is gray scale (any bitdepth, with or without alpha)

  indexed - Flag: has palette

Method Detail

• withSize

  public ImageInfo withSize(int cols,
                   int rows)

  returns a copy with different size

  Parameters:

  cols - if non-positive, the original is used

  rows - if non-positive, the original is used

  Returns:

  a new copy with the specified size and same properties

• getTotalPixels

  public long getTotalPixels()

• getTotalRawBytes

  public long getTotalRawBytes()

  Total uncompressed bytes in IDAT, including filter byte. This is not valid for interlaced.

• toString

  public String toString()

  Overrides:

  toString in class Object

• toStringBrief

  public String toStringBrief()

  Brief info: COLSxROWS[dBITDEPTH][a][p][g] ( the default dBITDEPTH='d8' is ommited)

• toStringDetail

  public String toStringDetail()

• hashCode

  public int hashCode()

  Overrides:

  hashCode in class Object

• equals

  public boolean equals(Object obj)

  Overrides:

  equals in class Object