COMPRESSIONOPTIONS

Summary

The COMPRESSIONOPTIONS structure contains compression information used with mask/picture segments and quality compression factor for the pictures area.

Syntax

typedef struct _tagCOMPRESSIONOPTIONS 
{ 
   L_UINT uStructSize; 
   L_INT nMaskCoder; 
   L_INT nPictureCoder; 
   L_INT nPictureQFactor; 
   L_INT nGrayscale2BitCoder; 
   L_INT nGrayscale8BitCoder; 
   L_INT nGrayscale8BitFactor; 
   L_INT nText2BitCoder; 
} COMPRESSIONOPTIONS, * pCOMPRESSIONOPTIONS; 

Members

L_UINT uStructSize

Size of this structure in bytes, for versioning. Use the sizeof() operator to calculate this value.

L_INT nMaskCoder

Flag that indicates the mask compression. Possible values are:

L_INT nPictureCoder

Flag that indicates the background (picture) compression type. Possible values are:

L_INT nPictureQFactor

Compression quality for JPEG, CMP and CMW compression for colored images.  Possible values are between 2 and 255, where 2 is the highest quality and 255 is the most compression. If the nPictureCoder is CMW or JPEG lossless compression, the nPictureQFactor should be 0.

L_INT nGrayscale2BitCoder

Flag that indicates the background (grayscale 2 bit) compression type. This value is valid only when saving in LEAD Proprietary T44 format using the L_MrcSaveBitmap function (when using the L_MrcSaveBitmapT44 function, all 2-bit grayscale segments are treated as picture segments). This member is used only if FILE_LEAD_MRC or FILE_TIF_LEAD_MRC is set in the nFormat parameter of either L_MrcSaveBitmap or L_MrcSaveBitmapList... Possible values are:

L_INT nGrayscale8BitCoder

Flag that indicates the background (grayscale 8 bit) compression type. This value is valid only when saving in LEAD Proprietary T44 format using the L_MrcSaveBitmap function (when using the L_MrcSaveBitmapT44 function, all 8-bit grayscale segments are treated as picture segments). This member is used only if FILE_LEAD_MRC or FILE_TIF_LEAD_MRC is set in the nFormat parameter of either L_MrcSaveBitmap or L_MrcSaveBitmapT44. Possible values are:

L_INT nGrayscale8BitFactor

Compression quality for JPEG, CMP and CMW compression for 8-bit grayscale images. This value is valid only when saving in LEAD Proprietary T44 format using the L_MrcSaveBitmap function (when using the L_MrcSaveBitmapT44 function, all 8-bit grayscale segments are treated as picture segments). Possible values are between 2 and 255, where 2 are the highest quality and 255 is the most compression. If the nGrayscale8BitCoder is CMW or JPEG lossless compression, the nGrayscaleFactor should be 0. This member is used only if FILE_LEAD_MRC or FILE_TIF_LEAD_MRC is set in the nFormat parameter of either L_MrcSaveBitmap or L_MrcSaveBitmapT44.

L_INT nText2BitCoder

Flag that indicates the text 2-bit compression type. This value is valid only when saving in LEAD Proprietary T44 format using the L_MrcSaveBitmap function, ). This member is used only if FILE_LEAD_MRC, FILE_TIF_LEAD_MRC, or FILE_PDF_LEAD_MRC is set in the nFormat parameter of either L_MrcSaveBitmap or L_MrcSaveBitmapList. Possible values are:

Comments

pCOMPRESSIONOPTIONS is a pointer to a COMPRESSIONOPTIONS structure. Where the message parameter type is pCOMPRESSIONOPTIONS, you can declare a COMPRESSIONOPTIONS variable, update the structure's fields, and pass the variable's address in the parameter. Declaring a pCOMPRESSIONOPTIONS variable is necessary only if your program requires a pointer.

When saving in standard T44 format using the L_MrcSaveBitmapT44 function, the only valid background compression is JPEG.

Usage

• L_MrcSaveBitmap
• L_MrcSaveBitmapList
• L_MrcSaveBitmapT44