ImageSaveOptions Class

Namespace:: GemBox.Spreadsheet

Assembly:: GemBox.Spreadsheet.dll

Represents a class which stores saving options for image files.

C#
VB.NET

public sealed class ImageSaveOptions : SaveOptions

Public NotInheritable Class ImageSaveOptions
    Inherits SaveOptions

Inheritance:: Object
SaveOptions
ImageSaveOptions

Constructors

ImageSaveOptions()

Initializes a new instance of the ImageSaveOptions class.

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VB.NET

public ImageSaveOptions()

Public Sub New

ImageSaveOptions(ImageSaveFormat)

Initializes a new instance of the ImageSaveOptions class for a specific image format.

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VB.NET

public ImageSaveOptions(ImageSaveFormat imageFormat)

Public Sub New(imageFormat As ImageSaveFormat)

Parameters

imageFormat: ImageSaveFormat

The image format.

Properties

ContentType

Gets the content-type for image file format:

image/png if Format is Png,
image/jpeg if Format is Jpeg,
image/gif if Format is Gif,
image/bmp if Format is Bmp,
image/tiff if Format is Tiff,
image/vnd.ms-photo if Format is Wmp.

C#
VB.NET

public override string ContentType { get; }

Public Overrides ReadOnly Property ContentType As String

Property Value

String

The content-type for image file format.

Overrides

SaveOptions.ContentType

CropToContent

Gets or sets a value indicating whether the image should be cropped to fit the content of the sheet.

If this property is set to true, only the content of the sheet is rendered, without headers or footers.

C#
VB.NET

public bool CropToContent { get; set; }

Public Property CropToContent As Boolean

Property Value

Boolean

DpiX

Gets or sets the horizontal dots per inch (dpi) of the image.

Default value is NaN, which means that component specific default value will be used (currently 300).

C#
VB.NET

public double DpiX { get; set; }

Public Property DpiX As Double

Property Value

Double

The horizontal dots per inch (dpi) of the image; that is, the dots per inch (dpi) along the x-axis.

Exceptions

ArgumentOutOfRangeException

Value is not greater than 0.

DpiY

Gets or sets the vertical dots per inch (dpi) of the image.

Default value is NaN, which means that component specific default value will be used (currently 300).

C#
VB.NET

public double DpiY { get; set; }

Public Property DpiY As Double

Property Value

Double

The vertical dots per inch (dpi) of the image; that is, the dots per inch (dpi) along the y-axis.

Exceptions

ArgumentOutOfRangeException

Value is not greater than 0.

Format

Gets or sets the image format.

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VB.NET

public ImageSaveFormat Format { get; set; }

Public Property Format As ImageSaveFormat

Property Value

ImageSaveFormat

The image format.

Height

Gets or sets the image height in pixels.

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VB.NET

public double Height { get; set; }

Public Property Height As Double

Property Value

Double

The image height in pixels.

Remarks

If both Width and Height are not specified, then image size will be equal to the page size.

If only one of the Width or Height is specified, then the specified dimension will be respected and other dimension will be calculated so that original aspect ratio is maintained.

If both Width and Height are specified, then both specified dimensions will be respected (which may result in non-uniformly scaled image, if aspect ratio is not equal to the original one.

Limitations

Gets limitations for saving to image file formats.

C#
VB.NET

public override FileFormatLimitations Limitations { get; }

Public Overrides ReadOnly Property Limitations As FileFormatLimitations

Property Value

FileFormatLimitations

Overrides

SaveOptions.Limitations

Remarks

These are the limits:

MaxRows: MaxValue
MaxColumns: MaxValue
MaxColors: MaxValue
MaxCellStyles: MaxValue

MetafileScaleFactor

Gets or sets the scaling factor for rendering metafile (WMF and EMF) images. Greater scaling factor improves quality but also increases file size. Default value is 1.

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VB.NET

public double MetafileScaleFactor { get; set; }

Public Property MetafileScaleFactor As Double

Property Value

Double

The metafile scale factor for rendering metafile (WMF and EMF) images.

Remarks

Windows Metafile Format (WMF) and Enhanced Metafile Format (EMF) are vector image formats which contain a series of graphics drawing commands usually executed in Windows GDI layer.

Metafile drawing commands could also be executed in PDF (or XPS) file which is also vector format, but for that Metafile drawing commands would have to be converted to PDF drawing commands.

GemBox.Document currently doesn't perform this conversion of drawing commands, instead it uses Windows GDI to execute Metafile drawing commands into bitmap which is then encoded to PNG format and embedded into PDF file.

MetafileScaleFactor specifies the size of the bitmap surface, based from the original Metafile surface size, into which Metafile should be drawn / rasterized.

PDF viewer will still scale the bitmap to the original Metafile size, but if the page is zoomed or viewed on a larger surface, quality of the image will be better since it contains more pixels / dots which will become visible while PDF viewer scales down the image.

MetafileScaleFactor increases the quality of the Metafile image in PDF file, but it also increases the size of the PDF file because greater MetafileScaleFactor means greater bitmap surface and more space to store bitmap pixel / color data. PNG encoding / compression helps in reducing the space requirement and for complex Metafiles (with a lot of drawing instructions), MetafileScaleFactor of 5 or even greater, might not incur any space overhead relative to the original (complex) Metafile.

Default value for MetafileScaleFactor is 1.

PageCount

Gets or sets the number of pages which should be saved to a multi-frame image.

If image format doesn't support multiple frames, this property is ignored.

Default value is 1.

To save all pages, set value to MaxValue.

Only Tagged Image File Format (TIFF) and Graphics Interchange Format (GIF) format images support multiple frames.

C#
VB.NET

public int PageCount { get; set; }

Public Property PageCount As Integer

Property Value

Int32

The number of pages which should be saved to a multi-frame image.

PageNumber

Gets or sets the zero-based page number of the document's page which should be saved to an image.

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VB.NET

public int PageNumber { get; set; }

Public Property PageNumber As Integer

Property Value

Int32

The zero-based page number of the document's page which should be saved to an image.

PixelFormat

Gets or sets a pixel format, which will be used for the image.

C#
VB.NET

public PixelFormat PixelFormat { get; set; }

Public Property PixelFormat As PixelFormat

Property Value

PixelFormat

The pixel format, which will be used for the image.

SelectionType

Gets or sets a value indicating whether to save a page from the whole ExcelFile or just ActiveWorksheet.

C#
VB.NET

public SelectionType SelectionType { get; set; }

Public Property SelectionType As SelectionType

Property Value

SelectionType

Remarks

Default value is ActiveSheet to optimize export since only active worksheet will be paginated.

If you want to render a specific page from an un-active worksheet, set that worksheet as ActiveWorksheet or change this property to EntireFile.

TiffCompression

Gets or sets compression schema, which will be used when exporting to Tagged Image File Format (TIFF).

C#
VB.NET

public TiffCompression TiffCompression { get; set; }

Public Property TiffCompression As TiffCompression

Property Value

TiffCompression

The compression schema, which will be used when exporting to Tagged Image File Format (TIFF).

Width

Gets or sets the image width in pixels.

C#
VB.NET

public double Width { get; set; }

Public Property Width As Double

Property Value

Double

The image width in pixels.

Remarks

If both Width and Height are not specified, then image size will be equal to the page size.

If only one of the Width or Height is specified, then the specified dimension will be respected and other dimension will be calculated so that original aspect ratio is maintained.

If both Width and Height are specified, then both specified dimensions will be respected (which may result in non-uniformly scaled image, if aspect ratio is not equal to the original one.

Events

ProgressChanged

Occurs when saving progress of a file has changed.

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VB.NET

public event EventHandler<OperationProgressChangedEventArgs> ProgressChanged

Public Event ProgressChanged As EventHandler(Of OperationProgressChangedEventArgs)

Event Type

EventHandler<OperationProgressChangedEventArgs>

Inherited Properties

CsvDefault	Gets the default options for saving to Character Separated Values file format. (Inherited from SaveOptions)
HtmlDefault	Gets the default options for saving to HyperText Markup Language File format. (Inherited from SaveOptions)
ImageDefault	Gets the default options for saving to image formats. (Inherited from SaveOptions)
OdsDefault	Gets the default options for saving to OpenDocument Spreadsheet file format. (Inherited from SaveOptions)
PdfDefault	Gets the default options for saving to Portable Document Format file. (Inherited from SaveOptions)
TxtDefault	Gets the default options for saving to Tab delimited file format. (Inherited from SaveOptions)
XlsDefault	Gets the default options for saving to, XLS file format (Microsoft Excel Spreadsheet format; Excel 2003 and prior versions) . (Inherited from SaveOptions)
XlsbDefault	Gets the default options for saving to XLSB file format (Microsoft Excel Binary File Format). (Inherited from SaveOptions)
XlsxDefault	Gets the default options for saving to XLSX file format (Microsoft Excel Open XML Spreadsheet; Excel 2007 and later). (Inherited from SaveOptions)
XpsDefault	Gets the default options for saving to XML Paper Specification file format. (Inherited from SaveOptions)