ImageSaveOptions Class

Namespace:

GemBox.Presentation

Assembly:

GemBox.Presentation.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:

System.Object

SaveOptions

ImageSaveOptions

Remarks

For more information about a level of support for image formats, see supported file formats.

Constructors

ImageSaveOptions()

Initializes a new instance of the ImageSaveOptions class.

• C#
• VB.NET

public ImageSaveOptions()

Public Sub New

ImageSaveOptions(ImageSaveFormat)

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

• C#
• 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,
• image/svg+xml if Format is Svg.

• C#
• VB.NET

public override string ContentType { get; }

Public Overrides ReadOnly Property ContentType As String

Property Value

System.String

The content-type for image file format.

Overrides

SaveOptions.ContentType

Dither

Gets or sets the value that indicated whether dithering should be applied when converting to pixel formats BlackWhite, Gray2, and Gray4.

Default value: true.

This property is currently ignored when RenderingMode is resolved to Skia.

• C#
• VB.NET

public bool Dither { get; set; }

Public Property Dither As Boolean

Property Value

System.Boolean

true if dithering should be applied when converting to pixel formats BlackWhite, Gray2, and Gray4; otherwise, false.

DpiX

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

Default value is System.Double.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

System.Double

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

Exceptions

System.ArgumentOutOfRangeException

Value is not greater than 0.

DpiY

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

Default value is System.Double.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

System.Double

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

Exceptions

System.ArgumentOutOfRangeException

Value is not greater than 0.

Format

Gets or sets the image format.

• C#
• 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.

• C#
• VB.NET

public double Height { get; set; }

Public Property Height As Double

Property Value

System.Double

The image height in pixels.

Remarks

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

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.

• C#
• VB.NET

public double MetafileScaleFactor { get; set; }

Public Property MetafileScaleFactor As Double

Property Value

System.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.Presentation 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.

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.

RenderingMode

Gets or sets the rendering mode used when saving the content to an image.

• C#
• VB.NET

public RenderingMode RenderingMode { get; set; }

Public Property RenderingMode As RenderingMode

Property Value

RenderingMode

The rendering mode used when saving the content to an image.

Exceptions

System.NotSupportedException

The rendering mode is not supported because of the reasons explained in the exception's System.Exception.Message.

SlideCount

Gets or sets the number of slides 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 slides, set value to System.Int32.MaxValue.

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

• C#
• VB.NET

public int SlideCount { get; set; }

Public Property SlideCount As Integer

Property Value

System.Int32

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

SlideNumber

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

• C#
• VB.NET

public int SlideNumber { get; set; }

Public Property SlideNumber As Integer

Property Value

System.Int32

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

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

System.Double

The image width in pixels.

Remarks

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

Inherited Properties

Image	Gets the default saving options for image file format. Image will be saved in Bmp format. (Inherited from SaveOptions)
Pdf	Gets the default saving options for Portable Document Format (PDF). (Inherited from SaveOptions)
Pptx	Gets the default saving options for PowerPoint Presentation (PPTX) format. (Inherited from SaveOptions)
Xps	Gets the default saving options for XML Paper Specification (XPS) format. (Inherited from SaveOptions)

See Also

Image

Save(String, SaveOptions)

Save(Stream, SaveOptions)