org.zkoss.poi.ss.util

Class ImageUtils

java.lang.Object

org.zkoss.poi.ss.util.ImageUtils

public class ImageUtils
extends java.lang.Object

Author:

Yegor Kozlov

Field Summary

Fields

Modifier and Type	Field and Description
static int	PIXEL_DPI

Constructor Summary

Constructors

Constructor and Description
ImageUtils()

Method Summary

Modifier and Type	Method and Description
static java.awt.Dimension	getImageDimension(java.io.InputStream is, int type) Return the dimension of this image
static int[]	getResolution(javax.imageio.ImageReader r) The metadata of PNG and JPEG can contain the width of a pixel in millimeters.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

PIXEL_DPI

public static final int PIXEL_DPI

See Also:

Constant Field Values

Constructor Detail

ImageUtils

public ImageUtils()

Method Detail

getImageDimension

public static java.awt.Dimension getImageDimension(java.io.InputStream is,
                                                   int type)

Return the dimension of this image

Parameters:

is - the stream containing the image data

type - type of the picture: Workbook.PICTURE_TYPE_JPEG, Workbook.PICTURE_TYPE_PNG or Workbook.PICTURE_TYPE_DIB

Returns:

image dimension in pixels

getResolution

public static int[] getResolution(javax.imageio.ImageReader r)
                           throws java.io.IOException

The metadata of PNG and JPEG can contain the width of a pixel in millimeters. Return the the "effective" dpi calculated as 25.4/HorizontalPixelSize and 25.4/VerticalPixelSize. Where 25.4 is the number of mm in inch.

Returns:

array of two elements: {horisontalPdi, verticalDpi}. {96, 96} is the default.

Throws:

java.io.IOException