Description

This property specifies the quality of Jpeg and Photo-realistic images compression.

Type

long (read/write)

Default value

75

Remarks

The possible values for the JpegImageQuality property are integer numbers in range 0-100.

The value of 0 applies lossless image compression algorithm to photo-realistic images in presentation. The values from 1 to 100 apply lossy image compression where 100 provides higher quality and 1 provides the smallest size and the lowest quality.

Photorealistic images can be represented in Flash format using Lossless (PNG-like) or Lossy (JPEG-like) image compression. Lossless image compression preserves the original quality of images but usually increases Flash file size. Lossy image compression usually provides higher compression rates especially for photo-realistic images but decreases their quality. Non-photo realistic images such as graphs, charts, or sketches being compressed with lossy algorithm lose their quality noteceably. That's why lossless algorithms are the most suitable for them.

There is so-called smart image compression technique available since FlashSpring Server 2.4 and FlashSpring Pro 3.0. FlashSpring analyses the content of raster images to determine whether they are photo-realistic or non-photo realistic and applies lossy or lossless image compression. This technique provides the best image quality as well as the reasonable file size.

Note: The smart image compression is automatically used when the ImageQuality property is set to 0 and the JpegImageQuality property is set to non-zero.

Example

The following example converts the presentation to solid Flash file using smart image compression.

Sub Sample()
    Dim fs As New FlashSpringAPI.FlashSpring
    fs.OpenPresentation "d:\temp\test.ppt"
    fs.Settings.Media.JpegImageQuality = 85
    fs.Settings.Media.ImageQuality = 0
    fs.GenerateFlash "c:\presentations", "myMovie.swf", OM_SOLID, "Standard"
    fs.ClosePresentation
    fs.ClosePowerPoint
End Sub

See Also

ImageQuality Property
GifImageQuality Property
MediaSettings Object