'Declaration
 
Public Property Chrominance As Integer

'Usage
 
Dim instance As SaveOptionsJpeg
Dim value As Integer
 
instance.Chrominance = value
 
value = instance.Chrominance

public int Chrominance {get; set;}

public: __property int get_Chrominance();
public: __property void set_Chrominance( 
   int value
);

public:
property int Chrominance {
   int get();
   void set (    int value);
}

Property Value

The default value is 10.

Valid Chrominance values range from 0 to 255.

A value of zero meaning no compression (maximum color quality) 255 means maximum image color compression (minimal image color quality.

JPEG and ePIC images are stored in a compressed format. Compression is lossy which means when saving JPEG or ePIC files, there is always data loss. Data loss is the result of JPEG and ePICs ability to achieve high compression ratios. Higher quality settings result in less compresion, while lower quality settings result in higher compression. Quality versus compression is a tradeoff. The image compression ratio can be adjusted by setting the Luminance and Chrominance properties.

The Lunimance property adjusts the luninance or grayscale quality and the Chrominance property adjusts the chrominance or color quality. Lower settings for these properties result in higher quality images with less compression. Higher settings for these properties result in lower quality images wit more compression.

For general use photographic type images, setting Luminance = 24 and Chrominance = 30 provides about a 12:1 image compression ratio with minimal data loss. Compression ratios and perceived image quality will vary depending on the image.

Note: Chrominance should always have a value equal or higher than Luminance.

Reference

SaveOptionsJpeg Class
SaveOptionsJpeg Members